//A basic forum
<?php
	<form action="action.php" method="post">
 		<p>Your name: <input type="text" name="name" /></p>
 		<p>Your age: <input type="text" name="age" /></p>
 		<p>Your message: <input type="textbox" name="message" /> </p>
 		<p><input type="submit" /></p>
		$txt="Hello World";
		echo $txt
	</form>
?>

//Finds the length of the string
<?php
echo strlen("Hello world!");
?>

<?php
	echo strpos("Hello world!","world");
?>