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The PHP script is executed on the server, and the plain HTML result is sent back to the browser.
Basic PHP Syntax
A PHP script can be placed anywhere in the document.
A PHP script starts with <?php and ends with ?>:
<?php
// PHP code goes here
?>
// PHP code goes here
?>
The default file extension for PHP files is ".php".
A PHP file normally contains HTML tags, and some PHP scripting code.
Below, we have an example of a simple PHP file, with a PHP script that sends the text "Hello World!" back to the browser:
Example
<!DOCTYPE html>
<html>
<body>
<h1>My first PHP page</h1>
<?php
echo "Hello World!";
?>
</body>
</html>
<html>
<body>
<h1>My first PHP page</h1>
<?php
echo "Hello World!";
?>
</body>
</html>
Run example »
Each code line in PHP must end with a semicolon. The semicolon is a separator and is used to distinguish one set of instructions from another.
With PHP, there are two basic statements to output text in the browser: echo and print.
Comments in PHP
Example
<!DOCTYPE html>
<html>
<body>
<?php
//This is a PHP comment line
/*
This is
a PHP comment
block
*/
?>
</body>
</html>
<html>
<body>
<?php
//This is a PHP comment line
/*
This is
a PHP comment
block
*/
?>
</body>
</html>
Run example »
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