Merge multiple arrays from one array

Question

How to merge multiple arrays from a single array variable ? lets say i have this in one array variable

Those are in one variable ..
$array

Answer 1

This is the PHP equivalent of javascript Function#apply (generate an argument list from an array):

$result = call_user_func_array("array_merge", $input);

demo: http://3v4l.org/nKfjp