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PHP Syntax ❮ Previous Next ❯

Basic PHP Syntax

A PHP script is executed on the server, and the plain HTML result is sent back to the browser.

A PHP script can be placed anywhere in the document.

A PHP script starts with <?php and ends with ?>:

<?php // PHP code goes here ?>

The default file extension for PHP files is .php.

A PHP file normally contains some HTML tags and some PHP scripting code.

Below, we have an example of a simple PHP file, with a PHP script that uses the PHP echo function to output some text on a web page:

Example

A simple .php file with both HTML code and PHP code:

<!DOCTYPE html> <html> <body> <h1>My first PHP page</h1> <?php echo 'Hello World!'; ?> </body> </html> Try it Yourself »

Note: All PHP statements end with a semicolon (;).

PHP Case Sensitivity

PHP keywords (e.g. if, else, echo, etc.), classes, functions, and user-defined functions are not case-sensitive.

In the example below, both echo statements are legal:

Example

ECHO is the same as echo:

<!DOCTYPE html> <html> <body> <?php ECHO 'Hello World!<br>'; echo 'Hello World!<br>'; ?> </body> </html> Try it Yourself »

Note: However; all variable names are case-sensitive!

Look at the example below; only the first statement will display the value of the $color variable! This is because $color and $COLOR are treated as two different variables:

Example

$COLOR is not same as $color:

<!DOCTYPE html> <html> <body> <?php$color = "red"; echo "My car is $color<br>"; echo "My house is $COLOR"; ?> </body> </html> Try it Yourself » ❮ Previous Next ❯ ★ +1 Sign in to track progress

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