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PHP Syntax

Basic rules of PHP syntax

A PHP script can be placed anywhere in the document. A PHP script starts with <?php and ends with ?> : 

The default file extension for PHP files is ".php".

A PHP file usually contains HTML tags and PHP script code.

Below we have an example of a basic PHP file with a PHP script that uses a built-in PHP function "echo" to output the text "Hello World!" on web page:



    
        <!DOCTYPE html>
        <html>
        <body>
        <h1>My first PHP page</h1>
        &lt;?php echo "Hello World!"; ?>
        </body>
        </html>