PHP Syntax


PHP script on the server is performed and the HTML output is sent to the browser.

A PHP script can be added to any part of the document.

PHP script begins with the character <? PHP and concludes with the character ?>:

 <?php
// PHP code goes here
?>

".php" is the standard file extension for PHP files.

Normal HTML elements for PHP and some scripting code are included within a PHP file.

Example :-

Here's an example of a simple PHP file, complete with a PHP script that utilises the built-in PHP function "echo" to produce the word "Hello World!" on a web page:

<!DOCTYPE html>
<html>
<body>

<?php
echo "Hello World!";
?>

</body>
</html>

Output :-

Hello World!

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

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PHP Case Sensitivity

Classes, functions, and keywords are specified by the user are not cases-sensitive in PHP (e.g. if, else, while, echo, and etc).

Example 1 :- In the example below, all three echo statements below are equal and legal:-

<!DOCTYPE html>
<html>
<body>

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

</body>
</html>

Output :-

Hello World!
Hello World!
Hello World!

Note :- All variable names, however, must be written in lower case!

Example 2:- Look at the example below; only the first statement will display the value of the $age variable! This is because $age, $AGE, and $aGE are treated as three different variables:-

<!DOCTYPE html>
<html>
<body>

<?php
$age = "23";
echo "My age is " . $age . "<br />";
echo "My age is " . $AGE . "<br />";
echo "My age is " . $aGE . "<br />";
?>

</body>
</html>

Output :-

My age is 23
My age is
My age is

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