dongwen9947 2013-07-25 17:00
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PHP array_intersect()直到第一次匹配

I have 2 arrays to compare and find if there is at least a single value in common.

This works just fine:

$arr1 = array(1, 2, 3, 4, 5);
$arr2 = array(2, 3, 4, 5, 6);
if (array_intersect($arr1, $arr2)) {
    // good, at least one match found
}

However, the question is performance. It doesn't make sense to continue looping thru the arrays after the first match was found. Is there a native PHP function or a useful snippet to achieve this?

Will a combination of foreach() and in_array() do the trick?

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  • douliao8402 2013-07-25 17:08
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    How about this?

    foreach ($arr1 as $key => $val) {
        if (in_array($val, $arr2)){
            // do something, maybe return so you wouldn't need break
            break;
        }
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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