Mini Shell

<?php	//	echo "yes" if the fields value is valid (and "no" if not)	$val = $_GET[ 'value' ];	switch( $_GET[ 'name' ] ) {		case 'required':			echo ( strlen( $val ) > 0 ) ? 'yes' : 'no';			break;		case 'number':			if ( strlen( $val ) == 0 ) {				echo 'yes';				break;			}			echo ( is_numeric( $val ) ) ? 'yes' : 'no';			break;		case 'email':			if ( strlen( $val ) == 0 ) {				echo 'yes';				break;			}			echo ( eregi( "^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $val ) ) ? 'yes' : 'no';			break;		case 'url':			if ( strlen( $val ) == 0 ) {				echo 'yes';				break;			}			$pattern = '/^(([\w]+:)?\/\/)?(([\d\w]|%[a-fA-f\d]{2,2})+(:([\d\w]|%[a-fA-f\d]{2,2})+)?@)?([\d\w][-\d\w]{0,253}[\d\w]\.)+[\w]{2,4}(:[\d]+)?(\/([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)*(\?(&amp;?([-+_~.\d\w]|%[a-fA-f\d]{2,2})=?)*)?(#([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)?$/';			echo ( preg_match( $pattern, $val ) ) ? 'yes': 'no';			break;		default:			echo 'yes';	}?>