<?php
	$invite1 = '18,19,20,21,22';
	$invite2 = '18,19';
	$a = explode(",",$invite1);
	$b = explode(",",$invite2);
	
	foreach ($a as $key=>$v1) {
		foreach($b as $key2=>$v2){
			if($v1==$v2){
			unset($a[$key]);//删除$a数组同值元素
			unset($b[$key2]);//删除$b数组同值元素
			}
		}
	}
	var_dump($a);	
	var_dump($b);
?>