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, $color); //$master += array($color => $num); //echo $color.' => '.$num; //echo "\n"; } } print_r($master);
based on HSrTA
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => R [1] => R [2] => R [3] => R [4] => B [5] => B [6] => B [7] => B [8] => G [9] => G [10] => G [11] => G [12] => Y [13] => Y [14] => Y [15] => Y )