PHP Arrays Functions Array An array can store

PHP Arrays Functions

Array • An array can store many values at once within a single variable. • Types of Arrays in PHP • There are three types of arrays that you can create. These are: • Indexed array — An array with a numeric key. • Associative array — An array where each key has its own specific value. • Multidimensional array — An array containing one or more arrays within itself.

Indexed Arrays • An indexed or numeric array stores each array element with a numeric index. The following examples shows two ways of creating an indexed array, the easiest way is <? php $colors = array("Red", "Green", "Blue"); print_r($colors); ? >

Print_r() function • The print_r() function is used to print humanreadable information about a variable. • the variable is an integer or a float or a string the function returns value of the variable. If the variable is an array the function returns keys and elements.

Indexed Arrays-Example <? php $cname= array ('Pakistan', 'Saudia Arabia', 'Turkey'); $salary= array (400, 3800, 6700); print_r($cname); echo ' '; print_r($salary); echo '<hr>'; ? >

How to to extract through loops <? php $colors = array("Red", "Green", "Blue"); for ($a=0; $a<3; $a++) { echo "Name: ". $colors[$a]. " "; } echo "<hr>";

Foreach Loop syntax • The “foreach” loop gives PHP an easy way to iterate over arrays and can only be used on arrays. • First syntax foreach ($array as $value) { code to be executed; } • Second syntax foreach ($array as $key => $value) { code to be executed; }

For Loop-indexed array <? php $colors = array("Red", "Green", "Blue"); for ($a=0; $a<3; $a++) { echo "Name: ". $colors[$a]. " "; } Output:

Fore each-indexed array $books= array ("PHP", "C++", "Java", "Perl”, "python"); foreach ( $books as $val) { echo $val. " "; Output: }

How to use counter to display data $counter=1; foreach ( $books as $val) { echo $counter. ". ". $val. " "; $counter++; } Output: echo " ";

Associative Arrays $ages = array("Nauman"=>22, "Hamid"=>32, "Danish"=>28); foreach ($ages as $x=>$y) { echo "Name: ". $x. " "; echo "Age: ". $y. " "; Output: }

Associative array: display in HTML Table $ages = array("Nauman"=>22, "Hamid"=>32, "Danish"=>28); echo "<table border=1> <tr><td> Name</td> <td> Age</td> </tr>"; foreach ($ages as $x=>$y) { echo "<tr><td>". $x. "</td>"; echo "<td>". $y. "</td></tr>"; } echo "</table>"; Output:

Multidimensional array $contacts = array( "name" => "Nauman", "email" => "nauman@mail. com", ), array( "name" => "Hamid", "email" => "hamid@mail. com", ), array( "name" => "Danish", "email" => "danish@mail. com", ) );

Multidimension array-Example • • • • $contacts = array( "name" => "Nauman", "email" => "nauman@mail. com", ), array( "name" => "Hamid", "email" => "hamid@mail. com", ), array( "name" => "Danish", "email" => "danish@mail. com", ) );

Multidimensional array. . con foreach ($contacts as $contacts_1) foreach ($contacts_1 as $x=>$y ) { echo $x. ": ". $y. " "; } Output: