PHP如何判断两个数组是否相同

<code>$arr1 = array('a'=>'good','b'=>'great')
$arr2 = array('A'=>'good','B'=>'great')
$arr3 = array('b'=>'great','a'=>'good')
</code>

<code>$arr1 = array('a'=>'good','b'=>'great')
$arr2 = array('A'=>'good','B'=>'great')
$arr3 = array('b'=>'great','a'=>'good')
</code>

<code>$arr1 = array('a'=>'good','b'=>'great');
$arr2 = array('A'=>'good','B'=>'great');
$arr3 = array('b'=>'great','a'=>'good');

var_dump(array_diff($arr1,$arr2));//empty
var_dump(array_diff($arr1,$arr3));//empty
var_dump(array_diff($arr2,$arr3));//empty

</code>

<code>function isSame ($arr1,$arr2){
    foreach ($value as $key => $arr1) {
        if(isset($arr2[$key])){
            if($arr2[$key] !=  $arr1[$key]){
                 return false;
            }
        }else{
            return false;
        }
    }
    return true
}
</code>

<code>function isSame($arr1, $arr2) {
    sort($arr1);
    sort($arr2);
    return $arr1 == $arr2;
}
</code>

<code>var_dump( ['b' => ' b', 'a' => 'a'] == ['a' => 'a', 'b' => ' b'] ); # bool(true)
</code>

<code>array_diff
</code>