Insert an item in the beginning of an associative array with string/custom key
'valueOne', 'keyTwo'=>'valueTwo'];
$array = array_reverse($array);
$array['newKey'] = 'newValue';
$array = array_reverse($array);
RESULT
[
'newKey' => 'newValue',
'keyOne' => 'valueOne',
'keyTwo' => 'valueTwo'
]