3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $master = array(); $arrColors = array('R', 'B', 'G' ,'Y'); $arrNumbers = array('1', '2', '3', '4'); foreach($arrColors as $color) { foreach($arrNumbers as $num) { array_push($master, $color, $num); //$master += array($color => $num); //echo $color.' => '.$num; //echo "\n"; } } print_r($master);
based on V9G42
Output for 4.3.0 - 7.1.0
Array ( [0] => R [1] => 1 [2] => R [3] => 2 [4] => R [5] => 3 [6] => R [7] => 4 [8] => B [9] => 1 [10] => B [11] => 2 [12] => B [13] => 3 [14] => B [15] => 4 [16] => G [17] => 1 [18] => G [19] => 2 [20] => G [21] => 3 [22] => G [23] => 4 [24] => Y [25] => 1 [26] => Y [27] => 2 [28] => Y [29] => 3 [30] => Y [31] => 4 )