PHP Basics and Demo HackU
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PHP Basics and Demo HackU



PHP Web primer slide for hackU at IIT Madras, 2012,

PHP Web primer slide for hackU at IIT Madras, 2012,



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  • What is PHP?!PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.Code is interpreted by a Web server with a PHP processor module which generates the resulting Web page.Includes a command-line interface capability and can be used in standalone graphical applications

PHP Basics and Demo HackU PHP Basics and Demo HackU Presentation Transcript

  • Glory with PHP Anshu Prateek
  • PHPHyperTextProcessor
  • Agenda• The basics• Enough PHP to handle simple request• How to talk to backend data store using PHP• How to parse/generate XML/JSON in PHP
  • What is it..?!• What is PHP?!• RasmusLerdorf – 1995• Compile or interpret?• CLI?
  • Pre-requisites LAMP/WAMP/MAMPL/W/M – Linux/Windows/Mac A – Apache M – Mysql P - PHP
  • About me.. Err.. PHP Latest Version : 5.4.0 (released on march 01, 2012)Presently hosted on github: Written in C, you can write your own modules!
  • The basics• Starts with <?php• <? Also accepted but recommended not to use due to xml usage• Closing ?> is not mandatory unless code structure requires closure.• Infact if possible, do not use closing ?> , helps avoid “header already sent” errors.• Double quotes allow variable substitution, single quotes don‟t.• Variables start with $
  • Helooo world!• <?php • php -r $greet =• $greet = “hello”; "hello";echo "$greet• Echo $greet.‟world‟; world";
  • Ways to put long text• <?php• $variable = „the long long long copied wikipedia text”; ?><html>…<body><?phpecho $text;?></body>
  • Or use HEREDOC• <?php• $name = „doctor who‟;• $html=<<<HTML• this is some html• And some more html• And only html!• And I can use $name „s alien powers as well!• HTML;• echo $html;
  • Strings•• The various inputs and outputs need to be formatted. Various functions.string substr ( string $string , int $start [, int $length ] )• string strstr ( string $haystack , mixed $needle [, bool $before_needle = false ] )• And many more…
  • Arrays• $array = array( "foo" => "bar", 42 => 24, "multi" => array( "dimensional" => array( "array" => "foo" ) ) );• var_dump($array["foo"]); var_dump($array[42]); var_dump($array["multi"]["dimensional"]["array "]);
  • Arrays..• p
  • Functions• Function <?php function renderList($array){ if( sizeof($array) > 0 ){ echo <ul>; foreach( $array as $key => $item ){ echo <li> . $key . : . $item . </li>; } echo </ul>; } } $lampstack = array( Operating System => Linux, Server => Apache, Database => MySQL, Language => PHP ); renderList($lampstack); ?>
  • Talking with your page• $_GET•• $query = $_GET[„query‟]• $_POST• <form id=“iitm>• <input type=“text” name=“userid” />• <submit>• </form>$id = $_POST[„userid‟];$_COOKIES;
  • Fetching data from the web..• BOSS• Uses OAUTH
  • Adding it all up together..Pictionary!1)Getting the user provided text.2) Remove the blacklist words.3) Get image for the rest of the words.Show me the code..!