PHP Syntax

PHP script starts with the <?php and ends with the ?> tag.

Syntax

<?php   
  //your code here  
   ?>  

Example

 <?php
 	// Some code to be executed
 	   echo "Hello, world!";
    ?>
 
 

Output:-

Statement end with a semicolon (;)

PHP with HTML

Example

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
  <title>A Simple PHP Example</title>
</head>
<body>
   <h1><?php echo "Hello, world!"; ?></h1>
	</body>
</html>

Save the example1.php

Output:-

PHP Comments

PHP support single-line as well as multi-line comments. To write a single-line comment either start the line with either two slashes (//) or a hash symbol (#).

Example

	<?php
	// This is a single line comment
	# This is also a single line comment
	echo "Hello, world!";
	?>

Output:-

PHP Case Sensitivity

Only Variable names are case-sensitive in PHP. such as variables $color, $Color and $COLOR

Example

	<?php
	// Assign value to variable
	$color = "blue";
	 
	// Try to print variable value
	echo "The color of the sky is " . $color . "<br>";
	echo "The color of the sky is " . $Color . "<br>";
	echo "The color of the sky is " . $COLOR . "<br>";
	?>

Output:-

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