PHP删除两个数组中相同的元素

<?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

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