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 :-
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!
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
My age is
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