Is it possible to prepend an associative array with literal key=>value pairs? I know that array_unshift() works with numerical keys, but I'm hoping for something that will work with literal keys.
作为一个例子，我想做以下几点:
$array1 = array('fruit3'=>'apple', 'fruit4'=>'orange');
$array2 = array('fruit1'=>'cherry', 'fruit2'=>'blueberry');
// prepend magic
$resulting_array = ('fruit1'=>'cherry',
'fruit2'=>'blueberry',
'fruit3'=>'apple',
'fruit4'=>'orange');