PHP array_push without numeric key

Use + for this. Try with -

$array = array('connect' => array('mydomain.com' => 1.99) );
$array['connect'] += array('mynewdomain.com' => 2.99);

Simply append element to the array.

$array['connect']['mynewdomain.com'] = 2.99;

No need to do array_push(). Just use PHP's in built constructs to get the job done.

In Built language constructs are more faster than in built functions and custom functions.

Use array_merge():

$array['connect'] = array_merge($array['connect'], $new_array);