Basic PHP Syntax
A PHP script can be placed anywhere in the document.
A PHP script starts with <?php and ends with ?>
Syntax:
<?php
// code comes here
?>
The default file extension for PHP files is ".php".
A PHP file contains HTML tags & 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:
<!DOCTYPE html5>
<html>
<head></head>
<body>
<h1>1st PHP page</h1>
<?php
echo "Hello World!";
?>
</body>
</html>
Note: PHP code statements end with a semicolon (;).
PHP Case Sensitivity
Keywords in PHP (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:
<!DOCTYPE html5>
<html>
<head></head>
<body>
<h1>2nd PHP page</h1>
<?php
ECHO "1st Check!";
eCHo "2nd Check!";
EchO "3rd Check!";
?>
</body>
</html>
Note: However; all variable names are case-sensitive!
Look at the example below; only the first statement will display the value of the $money variable! This is because $money, $MONEY, and $MoNey are treated as three different variables:
Example:
<!DOCTYPE html5>
<html>
<head></head>
<body>
<h1>2nd PHP page</h1>
<?php
$money=5000M;
echo "USA has $".$money;
echo "UK has $".$MONEY;
echo "UAE has $".$MoNey;
?>
</body>
</html>
Comment below if you have any queries related to the above tutorial for a basic Syntax of PHP Programming Language
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