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CS Learning Centre

PHP Tutorial. CS Learning Centre. Introduction. Based on PHP and MySQL Web Development, Third Edition (Available as CS eBook from Dal Library) Other eBooks from Dal Library Learning PHP 5 PHP Cookbook For Online resources, google “PHP”. Table of Contents. Embedding PHP Variables

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CS Learning Centre

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  1. PHP Tutorial CS Learning Centre

  2. Introduction • Based on PHP and MySQL Web Development, Third Edition (Available as CS eBook from Dal Library) • Other eBooks from Dal Library • Learning PHP 5 • PHP Cookbook • For Online resources, google “PHP”

  3. Table of Contents • Embedding PHP • Variables • Operators and Control Structures • Array • Function • Session Control (Using Cookie)

  4. Embedding PHP in HTML • Insert PHP tag inside HTML file (with .php extension • XML Style <?php PHP statement; ?> • Short Style (Need to be enabled) <? PHP statement; ?> • Script Style <SCRIPT LANGUAGE='php'> PHP statement; </SCRIPT> • ASP Style (Need to be enabled) <% PHP statement; %> • Dynamic Content function('argument'); • Note: argument is in string

  5. Variables • Do not require to declare variable type • Variable variables $varname = 'tireqty'; $$varname = 5; • Constants define('TIREPRICE', 100); • Accessing form variables (field=tireqty) • Short style (requires register_globals) $tieryqty • Medium style $_POST['tireqty'] or $_GET['tireqty'] • Long style $HTTP_POST_VARS['tireqty']

  6. Operators and Control Structures • Pretty much same as in other programming languages (C, Java, etc.) • Break statements are also same (continue, break), except it provides exit statement to break out of the script • Alternative control structure syntex if( $totalqty == 0): echo 'You did not order anything on the previous page!<br />'; exit; endif;

  7. Array • Create an array $products = array ('Tires', 'Oil', 'Engine'); • Automatically generate sequnces of number, character $numbers = range (1,10,2); //last parameter optional(Indicate step) • Accessing element $products[0] • Array with different indices $prices = array( 'Tires'=>100, 'Oil'=>10, 'Spark Plugs'=>4 ); • Assign key and value to variables list( $product, $price ) = each( $prices );

  8. Array (Cont'd) • Multidimensional Array ($products[row][column] $products = array( array( 'Code' => 'TIR', 'Description' => 'Tires', 'Price' => 100 ), array( 'Code' => 'OIL', 'Description' => 'Oil', 'Price' => 10 ), array( 'Code' => 'SPK', 'Description' => 'Spark Plugs', 'Price' =>4 ) );

  9. Function • New function function my_function() { echo 'My function was called'; } • Calling function my_function();

  10. Function (Cont'd) • Using argument • Should reset the argument if it is an array • The next command gets next element of arg • The current command gets current element • Ex. function create_table2( $data, $border = 1, $cellpadding = 4, $cellspacing = 4 ) { echo "<table border = $border cellpadding = $cellpadding" ." cellspacing = $cellspacing>"; reset($data); $value = current($data); while ($value) { echo "<tr><td>$value</td></tr>\n"; $value = next($data); } echo '</table>'; }

  11. Session Control (Using Cookie) • Manually setting Cookie in PHP bool setcookie (string name [, string value [, int expire [, string path [, string domain [, int secure]]]]]) Ex. setcookie ('mycookie', 'value'); • Using Cookie with Sessions • Get session cookie parameters session_get_cookie_params() • Set session cookie parameters session_set_cookie_params($lifetime, $path, $domain [, $secure]);

  12. Session Control (Cont'd) • Starting Session (Must be declared at the beginning of the file) session_start(); • Registering Session variables $_SESSION['myvar'] = 5; • Unsetting variables • Single variable unset($_SESSION['myvar']); • All variables $_SESSION=array(); • Destroying session session_destroy();

  13. Session Control (Example) • Begin session <?php session_start(); $_SESSION['sess_var'] = "Hello world!"; echo 'The content of $_SESSION[\'sess_var\'] is ' .$_SESSION['sess_var'].'<br />'; ?> <a href="page2.php">Next page</a>

  14. Session Control (Example) • Get the variable and unset it <?php session_start(); echo 'The content of $_SESSION[\'sess_var\'] is ' .$_SESSION['sess_var'].'<br />'; unset($_SESSION['sess_var']); ?> <a href="page3.php">Next page</a>

  15. Session Control (Example • End session <?php session_start(); echo 'The content of $_SESSION[\'sess_var\'] is ' .$_SESSION['sess_var'].'<br />'; session_destroy(); ?>

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