<form action="halo.php" method="post">
			Tulis Jenis kelamin anda = "L/P" 
<input name="jeniskelamin" type="text" />
<input type="submit" value="yang benar??" />
		</form>

	<?php
	/*HALAMAN halo.php*/
	$sex = $_POST['jeniskelamin'];
 
		if($sex='L'){
			echo "Halo ndes!!";
		}elseif($sex='P'){
			echo "Hello girls";
		}else{
			echo "Hello World";
		}
?>