Normally PHP script block starts with <?php and ends ?> and it can be embedded with HTML. PHP block can be placed anywhere in the document either with html tags or not.
HTML Embeded php code
<html>
<head>
<title>This is my First PHP Program</title>
</head>
<body>
<?php
echo "This is my First PHP Program";
?>
</body>
</html>
Pure PHP Code
<?php
echo "This is my First PHP Program";
?>
Shorthand PHP Code
Following code executed when the shorthand mood enabled in the server.
<? echo "This is my First PHP Program"; ?>
It is necessary to specify extention of the php file name as ".php" other wise php scrip does not execute.
Ex: Hello.php
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