PHP Basics Introduction to PHP a PHP file

PHP Basics Introduction to PHP • a PHP file, PHP workings, running PHP. • Basic PHP syntax • variables, operators, if. . . else. . . and switch, while, do while, and for. Some useful PHP functions How to work with • HTML forms, cookies, files, time and date. How to create a basic checker for user-entered data

What do You Need? ﻣی ﻧﻮیﺴیﺪ PHP ﺷﻤﺎ ﺑﻪ ﻧﺮﻡ ﺍﻓﺰﺍﺭﻫﺎی ﺯیﺮ ﺑﺮﺍی ﺍﺟﺮﺍی ﻭﺏ ﺳﺎیﺘﻬﺎیی کﻪ ﺑﺎ : ﺩﺍﺭیﺪ PHP ﺯﺑﺎﻥ ﺍﺳکﺮیپﺖ ﻧﻮیﺴی 1 My. SQL –پﺎیگﺎﻩ ﺩﺍﺩﻩ 2 iis ﻭﺏ ﺳﺮﻭﺭ آپﺎچی یﺎ 3 - § Download PHP for free here: http: //www. php. net/downloads. php § Download My. SQL for free here: http: //www. mysql. com/downloads/index. html § Download Apache for free here: http: //httpd. apache. org/download. cgi

switch : ﺷﺮﻁ <html><head></head> <body> <!–- switch-cond. php COMP 519 --> <? php $x = rand(1, 5); // random integer echo “x = $x <br/>”; switch ($x) { case 1: echo "Number 1"; break; case 2: echo "Number 2"; break; case 3: echo "Number 3"; break; default: echo "No number between 1 and 3"; } ? > </body> </html> switch (expression) { case label 1: code to be executed if expression = label 1; break; case label 2: code to be executed if expression = label 2; break; default: code to be executed if expression is different from both label 1 and label 2; } view the output page

do-while ﻭ while : ﺣﻠﻘﻪ <html><head></head> <body> <? php $i=1; while($i <= 5) { echo "The number is $i "; $i++; } ? > </body> </html> view the output page while ﺣﻠﻘﻪ <html><head></head> <body> <? php $i=0; do { $i++; echo "The number is $i "; } while($i <= 10); ? > </body> </html> view the output page do-while ﺣﻠﻘﻪ

foreach ﻭ for : ﺣﻠﻘﻪ <? php for ($i=1; $i<=5; $i++) { echo "Hello World! "; } ? > <? php $a_array = array(1, 2, 3, 4); foreach ($a_array as $value) { $value = $value * 2; echo “$value <br/> n”; } ? > یک ﺣﻠﻘﻪ ﺑﺎ ﺗﻌﺪﺍﺩ ﺗکﺮﺍﺭ ﻣﺸﺨﺺ view the output page <? php $a_array=array("a", "b", "c"); foreach ($a_array as $key=>$value) { echo $key. " = ". $value. "n"; } ? > . ﺑﻪ ﺍﻧﺪﺍﺯﻩ ﻋﻨﺎﺻﺮ آﺮﺍیﻪ ﺗکﺮﺍﺭ ﻣی ﺷﻮﺩ

User Defined Functions <? php function foo($arg_1, $arg_2, /*. . . , */ $arg_n) { echo "Example function. n"; return $retval; } ? > <? php function square($num) { return $num * $num; } echo square(4); ? > <? php function small_numbers() { return array (0, 1, 2); } list ($zero, $one, $two) = small_numbers(); echo $zero, $one, $two; echo "<br/>“ ? > <? php function takes_array($input) { echo "$input[0] + $input[1] = ", $input[0]+$input[1]; } takes_array(1, 2)); echo "<br/>“ ? > view the output page

Including Files. یک ﻓﺎیﻞ ﺭﺍ ﺍﻟﺤﺎﻕ ﻭ ﺍﺭﺯیﺎﺑی ﻣی کﻨﺪ include() ﻋﺒﺎﺭﺕ vars. php <? php function foo() { global $color; $color = 'green'; $fruit = 'apple'; ? > include ('vars. php‘); test. php <? php echo "A $color $fruit"; } echo "A $color $fruit"; // A include 'vars. php'; /* * vars. php is in the scope of foo() so * $fruit is NOT available outside of this * scope. $color is because we declared it * as global. */ echo "A $color $fruit"; // A green apple foo(); echo "A $color $fruit"; ? > // A green apple // A green ? > view the output page . • ﻣﺤﺪﻭﺩﻩ ﻣﺘﻐییﺮﻫﺎی کﻪ ﺩﺭ ﻓﺎیﻞ ﺍﻟﺤﺎﻕ ﺷﺪﻩ ﺗﻌﺮیﻒ ﺷﺪﻩ ﺍﻧﺪ ﺑﻪ ﻣﺤﻞ ﺍﻟﺤﺎﻕ ﻓﺎیﻞ ﺑﺴﺘگی ﺩﺍﺭﺩ . ﻧیﺰ ﺍﺳﺘﻔﺎﺩﻩ ﻧﻤﻮﺩ require_once ﻭ include_once • ﻣی ﺗﻮﺍﻥ ﺍﺯ ﻋﺒﺎﺭﺗﻬﺎی

PHP Information. ﻧﺼﺐ ﺷﺪﻩ ﺍﺳﺘﻔﺎﺩﻩ ﻣی گﺮﺩﺩ PHP ﺑﺮﺍی ﻧﻤﺎیﺶ ﺍﻃﻼﻋﺎﺕ کﻠی ﻧﺴﺨﻪ phpinfo() ﺗﺎﺑﻊ <html><head></head> <!– info. php COMP 519 <body> <? php // Show all PHP information phpinfo(); ? > <? php // Show only the general information phpinfo(INFO_GENERAL); ? > </body> </html> view the output page INFO_GENERAL line, The configuration php. ini location, build date, Web Server, System and more INFO_CREDITS PHP 4 credits INFO_CONFIGURATION Local and master values for php directives INFO_MODULES Loaded modules INFO_ENVIRONMENT Environment variable information INFO_VARIABLES variables All predefined from EGPCS INFO_LICENSE PHP license information INFO_ALL Shows all of the above (default)

Server Variables. یک ﻣﺘﻐییﺮ ﺭﺯﺭﻭ ﺷﺪﻩ ﺍﺳﺖ کﻪ ﺗﻤﺎﻡ ﺍﻃﻼﻋﺎﺕ ﺳﺮﻭﺭ ﺍﺯ ﻃﺮیﻖ آﻦ ﻗﺎﺑﻞ ﺩﺳﺘﺮﺳی ﺍﺳﺖ $_SERVER. ﺍیﻦ ﻣﺘﻐییﺮ یک ﻣﺘﻐییﺮ ﻋﻤﻮﻣی ﺍﺳﺖ <html><head></head> <body> <? php echo "Referer: ". $_SERVER["HTTP_REFERER"]. " "; echo "Browser: ". $_SERVER["HTTP_USER_AGENT"]. " "; echo "User's IP address: ". $_SERVER["REMOTE_ADDR"]; ? > </body> </html> view the output page

کﺎﺭ ﺑﺎ ﻓﺎیﻠﻬﺎ . ﺑﻨﺪﺩ ﻓﺎیﻞ ﺭﺍ ﻣی fclose(). یک کﺎﺭﺍکﺘﺮ ﺍﺯ ﻓﺎیﻞ ﻣی ﺧﻮﺍﻧﺪ fgetc() یک ﺭﺷﺘﻪ ﺭﺍ ﺑﺎ یﺎ fputs ﻭ ﻣﻌﺎﺩﻝ آﻦ fwrite(). ﺩﺭ ﻓﺎیﻞ ﻣی ﻧﻮیﺴﺪ n ﺑﺪﻭﻥ <? php $my. File = "welcome. txt"; if (!($fh=fopen($my. File, 'r'))) exit("Unable to open file. "); while (!feof($fh)) { $x=fgetc($fh); echo $x; } fclose($fh); view the output ? > page <? php $lines = file('welcome. txt'); foreach ($lines as $l_num => $line) { echo "Line #{$l_num}: ". $line. "<br/>"; view the output } ? > page . ﺍﺳﺖ true ﺍگﺮ ﺩﺭ آﺨﺮ ﻓﺎیﻞ ﺑﺎﺷیﻢ feof() • . یک ﺧﻂ ﺍﺯ ﻓﺎیﻞ ﺭﺍ ﻣی ﺧﻮﺍﻧﺪ fgets() • . کﻞ ﻓﺎیﻞ ﺭﺍ ﺩﺍﺧﻞ یک آﺮﺍیﻪ ﻣی ﺭیﺰﺩ file() • <? php $my. File = "welcome. txt"; $fh = fopen($my. File, 'r'); $the. Data = fgets($fh); fclose($fh); echo $the. Data; view the output ? > page <? php $my. File = "test. File. txt"; $fh = fopen($my. File, 'a') or die("can't open file"); $string. Data = "New Stuff 1n"; fwrite($fh, $string. Data); $string. Data = "New Stuff 2n"; fwrite($fh, $string. Data); fclose($fh); view the output ? > page

کﺎﺭ کﺮﺩﻥ ﺑﺎ ﻓﺮﻣﻬﺎ <html> <-- form. html COMP 519 --> <body> <form action="welcome. php" method="POST"> Enter your name: <input type="text" name="name" /> <br/> Enter your age: <input type="text" name="age" /> <br/> <input type="submit" /> <input type="reset" /> </form> </body> </html> <!–- welcome. php COMP 519 --> <body> Welcome <? php echo $_POST["name"]. ”. ”; ? > You are <? php echo $_POST["age"]; ? > years old! </body> </html> view the output page $_POST contains all POST data. $_GET contains all GET data.

Required Fields in User-Entered Data ﺳپﺲ ﺑﺮﻧﺎﻣﻪ چک ﻣی کﻨﺪ. ﺩﺭ ﺍیﻦ ﻣﺜﺎﻝ ﺍﺯ کﺎﺭﺑﺮ ﺍﻃﻼﻋﺎﺗی گﺮﻓﺘﻪ ﻣی ﺷﻮﺩ کﻪ کﺎﺭﺑﺮ ﻗﺴﻤﺘﻬﺎی ﻻﺯﻡ ﺭﺍ پﺮ کﺮﺩﻩ ﺍﺳﺖ یﺎ ﻧﻪ؟ <html> <!-- form_checker. php COMP 519 --> <head> <title></title> </head> <body> <? php /*declare some functions*/ Print Function function print_form($f_name, $l_name, $email, $os) { ? > <form action="form_checker. php" method=“POST"> First Name: <input type="text" name=" f_name" value="<? php echo $f_name? >“ /> <br/> Last Name <b>*</b>: <input type="text" name=" l_name" value="<? php echo $l_name? >“ /> <br/> Email Address <b>*</b>: <input type="text" name="email" value=" <? php echo $email? >“ /> <br/> Operating System: <input type="text" name=" os" value="<? php echo $os? >“ /> <br/> <input type="submit" name="submit" value="Submit“ /> <input type=“reset“ /> </form> <? php }

Check and Confirm Functions function check_form($f_name, $l_name, $email, $os) { if (!$l_name||!$email){ echo "<h 3>You are missing some required fields!</h 3>"; print_form($f_name, $l_name, $email, $os); } else{ confirm_form($f_name, $l_name, $email, $os); } } function confirm_form($f_name, $l_name, $email, $os) { ? > <h 2>Thanks! Below is the information you have sent to us. </h 2> <h 3>Contact Info</h 3> <? php echo "Name: $f_name $l_name <br/>"; echo "Email: $email <br/>"; echo "OS: $os"; }

Main Program /*Main Program*/ if (!$_POST["submit"]) { ? > <h 3>Please enter your information</h 3> <p>Fields with a "<b>*</b>" are required. </p> <? php print_form("", "", ""); } else{ check_form($_POST["f_name"], $_POST["l_name"], $_POST["email"], $_POST["os"]); } ? > </body> </html> view the output page