PHP Syntax: 003

Cohort Master · Mar 31, 2024, 05:23 PM

A 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

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<?php and ends with ?>:

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<?php
// 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 uses a built-in PHP function "echo" to output the text "Hello World!" on a web page:

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

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<!DOCTYPE html>
<html>
<body>

<h1>My first PHP page</h1>

<?php
echo "Hello World!";
?>

</body>
</html>

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

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

In the example below, all three echo statements below are equal and legal:

Example
ECHO is the same as echo:

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<!DOCTYPE html>
<html>
<body>

<?php
ECHO "Hello World!<br>";
echo "Hello World!<br>";
EcHo "Hello World!<br>";
?>

</body>
</html>

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PHP Syntax: 003

Cohort Master