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run code in 150+ php & hhvm versions
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<?php // convert decimal to base 2 without using base_convert or printf $base = 2; $decnum = 23; $num = 23; while( $num > 0) { $arr[] = $num % $base; // store remainder in array $num = floor($num/$base); // no integer division } var_dump($arr); $wrong = join('',$arr); var_dump($wrong); $cat = join('',array_reverse($arr)); var_dump($cat); printf("%b",$decnum);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(1) [3]=> int(0) [4]=> int(1) } string(5) "11101" string(5) "10111" 10111