查找数组匹配并删除元素

Question

给定两个数组：

$arr1 = (1, 0, 9);
$arr2 = (8, 0, 2, 9, 4);

如何删除$arr2 中包含在$arr1 中的元素？
这将返回$arr3 = (8, 2, 4);

我试过了：

<?php
foreach($arr1 as $item)
{
       if(in_array($item, $arr2))
       {
          # This is were I lose it, I've found a match then what?
       }
}
?>

Answer 1

array_diff 就是你要找的东西

看看here

$arr1 = array(1, 0, 9);
$arr2 = array(8, 0, 2, 9, 4);

echo print_r(array_diff($arr2,$arr1),true);

>> Array ( [0] => 8 [2] => 2 [4] => 4 )