//PHP code here
Following PHP script uses a built-in PHP function “echo” to print “Hello World!” on a web page.
<title>PHP Hello World</title>
<h1><?php echo “Hello World!”; ?></h1>
PHP Case Sensitivity
The variable names in PHP are case-sensitive which mean $name, $Name, and $NAME are three different variables. However the keywords (e.g. if, else, print, while etc.), function and class names are case-insensitive. As a result calling the print or PRINT produce the same result.