4. What is PHP?
• Server side language
• Very easy to learn
• Available on LAMP stack (Linux Apache Mysql
PHP)
• Does not require any special tools. Create a file
with .php extension and your done.
5. What we need to learn?
• Enough PHP to handle simple request
• How to talk to backend data store using PHP
• How to parse XML/JSON in PHP
• How to generate JSON in PHP
6. Getting Started
• You need a local server with PHP enabled.
• XAMPP for windows
• MAMP for Mac OSx
• Linux has it by default
7. Create a file hello.php into htdocs and call it like this
http://localhost:80/hello.php
<?php
$college = “IIT-BOMBAY”;
echo “Hello “ . $college;
?>
Getting Started
8. • 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.
• $college 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:
9. <?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
demo1.php
10. 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
15. Interacting with the web - URL
parameters
<?php
$name = “Sumana”
// if there is no language defined, switch to English
if( !isset($_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
16. Loading content from the web
<?php
// define the URL to load
$url = 'http://cricket.yahoo.com/player-profile/Sachin-
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