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run code in 150+ php & hhvm versions
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<?php $master = array(); $arrColors = array('R', 'B', 'G' ,'Y'); $arrNumbers = array('1', '2', '3', '4'); foreach($arrColors as $color) { foreach($arrNumbers as $num) { //$master[$color] = $num; $temp = $color.' - '.$num; array_push($master, $temp); //echo "\n"; } } print_r($master);
based on eV97A
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 [1] => R - 2 [2] => R - 3 [3] => R - 4 [4] => B - 1 [5] => B - 2 [6] => B - 3 [7] => B - 4 [8] => G - 1 [9] => G - 2 [10] => G - 3 [11] => G - 4 [12] => Y - 1 [13] => Y - 2 [14] => Y - 3 [15] => Y - 4 )