<?php
	function cmp($a,$b) {
		preg_match("~[0-9]+\.?[0-9]*~", $a, $reg_a);
		preg_match("~[0-9]+\.?[0-9]*~", $b, $reg_b);
		return $reg_a[0]>$reg_b[0]?1:($reg_a[0]<$reg_b[0]?-1:0);
	}
	$ar= array("dfg9", "dfg9.6", "dfg9.2", "dfg7.1", "hjk3", "yui4");
	usort($ar,"cmp");
	print_r($ar);
?>