php - How to get key of an associative array by searching for offset value? -

using example , being aware of key,

$arr = array(     'product1'=>array('color'=>'blue','size'=>'medium'),     'product2'=>array('color'=>'green','size'=>'large'),     'product3'=>array('color'=>'yellow','size'=>'small'), ); 

is there method getting key in multidimensional array incremented value?

for example, i'd key of third array value in $arr above. $arr[2] return value (an array containing yellow/small).

is there way leverage key function key numeric iterator, rather key "current position"?

or, there built-in function overlooking return key of $arr[2] instead of it's value?

echo getkey($arr[2]);  # returns product3 

just use array_keys function :

$arr = array(             'product1'=>array('color'=>'blue','size'=>'medium'),             'product2'=>array('color'=>'green','size'=>'large'),             'product3'=>array('color'=>'yellow','size'=>'small'),         );  $keys = array_keys($arr);  echo $keys[2];  // shorter version echo array_keys($arr)[2]; 

more infos : http://php.net/manual/en/function.array-keys.php