3v4l.org

run code in 300+ PHP versions simultaneously
<?php $dataArray = [ [1, 1, 0], [1, 0, 1], [1, 1, 0], [1, 0, 0], [1, 0, 0] ]; $onePositions = array_map(function($row) { return array_map(function($position) { return $position + 1; }, array_keys($row, 1)); }, $dataArray); var_dump($onePositions);
Output for 5.6.38, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
array(5) { [0]=> array(2) { [0]=> int(1) [1]=> int(2) } [1]=> array(2) { [0]=> int(1) [1]=> int(3) } [2]=> array(2) { [0]=> int(1) [1]=> int(2) } [3]=> array(1) { [0]=> int(1) } [4]=> array(1) { [0]=> int(1) } }
preferences:
162.1 ms | 408 KiB | 5 Q