how does array_diff work?

Posted by SpawnCxy on Stack Overflow See other posts from Stack Overflow or by SpawnCxy
Published on 2010-03-19T19:11:23Z Indexed on 2010/03/19 19:21 UTC
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Filed under:

php

|

array

|

Performance

I just wonder how array_diff() works.And obviously it couldn't work as follows

function array_diff($arraya, $arrayb)
{
    $diffs = array();
    foreach ($arraya as $keya => $valuea)
    {
        foreach ($arrayb as $valueb)     
        {
            if ($valuea == $valueb)
            {
                break;
            }
            $diffs[$keya]=$valuea;
        }
    }
    return $diffs;                          
}                                  //couldn't be worse than this

Hope someone can show me some better solution.

Thanks.

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