Introduction to Iterators Debug Session Marcus Brger OSCON
Introduction to Iterators Debug Session Marcus Börger OSCON 2004 Marcus Börger Introduction to Iterators
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 2
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 3
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 4
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 5
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 6
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 7
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 8
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 9
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 10
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 11
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 12
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 13
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 14
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 15
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 16
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 17
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 18
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 19
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 20
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 21
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 22
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 23
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > Introduction to Iterators 24
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 25
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 26
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 27
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 28
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 29
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 30
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 31
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 32
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 33
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 34
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 35
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 36
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 37
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 38
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 39
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 40
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 41
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 Introduction to Iterators 42
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 43
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 44
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 45
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 46
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 47
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 48
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 49
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 50
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 51
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 52
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 53
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 54
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 55
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 56
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 57
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 58
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 59
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 Introduction to Iterators 60
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 61
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 62
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 63
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 64
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 65
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 66
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 67
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 68
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 69
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 70
An example <? php class Array. Iterator { protected $ar; function __construct(Array $ar) { $this->ar = $ar; } function rewind() { rewind($this->ar); } function valid() { return !is_null(key($this->ar)); } function key() { return key($this->ar); } function current() { return current($this->ar); } function next() { next($this->ar); } } ? > Marcus Börger <? php $a = array(1, 2, 3); $o = new Array. Iterator($a); foreach($o as $key => $val) { echo "$key => $van"; } ? > 0 => 1 1 => 2 2 => 3 Introduction to Iterators 71
- Slides: 71