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@ 2013-10-25T06:33:59Z

<?php
    $arr1 = array(
        'a' => 'Apple',
        'b' => 'Banana'
    );

    $arr2 = array(
        'b' => 'Banana',
        'a' => 'Australia',
        'Apple'
    );

    $arr3 = array_diff($arr1, $arr2);
    $arr4 = array_diff($arr2, $arr1);

    $keys = array_keys($arr4);

    echo count($arr3) . ' - ' . $keys[0];
?>

Output
Performance
VLD
References
Branches

array_keys: documentation ( source)
array_diff: documentation ( source)

preferences:dark modelive preview

48.67 ms | 402 KiB | 5 Q