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    Phphacku iitd Phphacku iitd Presentation Transcript

    • Sorabh Jain IIT-Delhi 9-Aug-2013 Hacks With PHP, MySQL & JS
    • Why PHP ? It is a server side scripting language which allows you to :- • Dynamically edit, change or add any content to a Web page • Respond to user queries or data submitted from HTML forms • Access any data or databases and return the result to a browser • Customize a Web page to make it more useful for individual users • Provide security since your server code cannot be viewed from a browser • Does not require any special tools. Create a file with .php extension and your done.
    • Why JavaScript ? • Client side scripting language which makes your browser more interactive. • No need to go back to server for form validation • JavaScript inserted into HTML pages, can be executed by all modern web browsers. • It makes you static HTML page dynamic which was not easy with CSS.
    • Why MySQL ? • Open source data storage RDBMS which is easy to install and use with any operating system. • Lot of support and libraries available in scripting languages like php.
    • What we need to learn? • Enough PHP to handle simple request • How to talk to mysql data store using PHP • How to parse/generate XML/JSON in PHP • Enough JavaScript to make browser interactive
    • How it works?
    • Getting Started • You need a local server with PHP enabled. • XAMPP for windows • MAMP for Mac OSx • Linux has it by default
    • <?php $school=”IIT-Delhi"; echo "Hello, $school hackers"; ?> Create a file hello.php into webserver directory and call it like this http://localhost:80/hello.php Getting Started
    • Basic Syntax • PHP blocks start with <?php and end with ?> - • Every line of PHP has to end with a semicolon ";” • Variables in PHP start with a $ • You print out content to the document in PHP with the echo command. • $school is variable and it can be printed out • You can jump in and out of PHP anywhere in the document. So if you intersperse PHP with HTML blocks, that is totally fine. For example:
    • <?php $origin = 'Outer Space'; $planet = 'Earth'; $plan = 9; $sceneryType = "awful"; ?> <h1>Synopsis</h1><p>It was a peaceful time on planet <?php echo $planet;?> and people in the <?php echo $sceneryType;?> scenery were unaware of the diabolic plan <?php echo $plan;?> from <?php echo $origin;?> that will take their senses to the edge of what can be endured.</p> Mix Match • You can mix and match HTML and PHP demo1.php
    • Displaying more complex data • You can define arrays in PHP using the array() method $lampstack = array('Linux','Apache','MySQL','PHP'); • If you simply want to display a complex datatype like this in PHP for debugging you can use the print_r() command $lampstack = array('Linux','Apache','MySQL','PHP'); print_r($lampstack); demo2.php
    • Arrays • Accessing arrays using index <ul> <?php $lampstack = array('Linux','Apache','MySQL','PHP'); echo '<li>Operating System:'.$lampstack[0] . '</li>'; echo '<li>Server:' . $lampstack[1] . '</li>'; echo '<li>Database:' . $lampstack[2] . '</li>'; echo '<li>Language:' . $lampstack[3] . '</li>'; ?> </ul> demo3.php
    • Arrays • Iterating through arrays <ul> <?php $lampstack = array(’MacOs','Apache','MySQL','PHP'); $labels = array('Operating System','Server','Database','Language'); $length = sizeof($lampstack); for( $i = 0;$i < $length;$i++ ){ echo '<li>' . $labels[$i] . ':' . $lampstack[$i] . '</li>'; } ?> </ul> sizeof($array) - this will return the size of the array demo4.php
    • Associative Arrays • PHP has associative arrays with string keys <ul> <?php $lampstack = array( 'Operating System' => 'Linux', 'Server' => 'Apache', 'Database' => 'MySQL', 'Language' => 'PHP' ); $length = sizeof($lampstack); $keys = array_keys($lampstack); for( $i = 0;$i < $length;$i++ ){ echo '<li>' . $keys[$i] . ':' . $lampstack[$keys[$i]] . '</li>'; } ?> </ul> demo5.php
    • Functions <?php function renderList($array){ if( sizeof($array) > 0 ){ echo '<ul>'; foreach( $array as $key => $item ){ echo '<li>' . $key . ':' . $item . '</li>'; } echo '</ul>'; } } $lampstack = array( 'Operating System' => ’Windows', 'Server' => 'Apache', 'Database' => 'MySQL', 'Language' => 'PHP' ); renderList($lampstack); ?> demo6.php
    • Interacting with the web - URL parameters <?php $name = 'Tom'; // if there is no language defined, switch to English if( !isset($_GET['language']) ){ $welcome = 'Oh, hello there, '; } if( $_GET['language'] == 'hindi' ){ $welcome = 'Namastae, '; } switch($_GET['font']){ case 'small': $size = 80; break; case 'medium': $size = 100; break; case 'large': $size = 120; break; default: $size = 100; break; } echo '<style>body{font-size:' . $size . '%;}</style>'; echo '<h1>'.$welcome.$name.'</h1>'; ?> demo7.php
    • Loading content from the web <?php // define the URL to load $url = ' Tendulkar_2962'; // start cURL $ch = curl_init(); // tell cURL what the URL is curl_setopt($ch, CURLOPT_URL, $url); // tell cURL that you want the data back from that URL curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // run cURL $output = curl_exec($ch); // end the cURL call (this also cleans up memory so it is // important) curl_close($ch); // display the output echo $output; ?> demo8.php
    • Connecting to MySQL • Simple example to fetch data from DB
    • Twitter Api Demo • Creating a sample app on twitter developer network • Giving proper permissions to app and specifying which url we want to hit from twitter app. • Writing code to make o-auth call to twitter • Making twitter api calls after successful o-auth validation.
    • Sample Codes PHP sample code:- Twitter Api demo code:- Twitter api docs:-
    • Further Reference http://phpforhacks/index.html