PHP Syntax coading with HTML Tag

Basic PHP Syntax
A PHP script can be placed anywhere in the document.The PHP script is executed on the server, and the plain HTML result is sent back to the browser
A PHP script starts with <?php and ends with ?>

<?php
// Here the PHP code goes 
?>

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 India!” on a web page:
Example

<!DOCTYPE html>
<html>
<body>

<h1>My first PHP page</h1>

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

</body>
</html>

NOTE- The default file extension for PHP files is “.php”.
PHP Case Sensitivity
In PHP, all user-defined functions, classes, echo , and keywords are NOT case-sensitive.
Example

<!DOCTYPE html>
<html>
<body>

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

</body>
</html>

PHP Comments
A comment in PHP code is a line that is not read/executed as part of the program. Its only purpose is to be read by someone who is editing the code!
PHP supports three ways of commenting:
Example

<!DOCTYPE html>
<html>
<body>

<?php
// This is a single line php comment

# This is also a single line php comment

/*
This is a multiple lines comment in php block that spans over more than one line
*/
?>

</body>
</html>
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