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run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = [ [15, 16, 8, 1], [2, 3, 4, 7], [9, 11, 19, 6] ]; function bubbleSortRowCol(&$arr) { $colCount = count($arr[0]); $rowCount = count($arr); $tempArr = []; $columnArr = []; foreach($arr as $key => $value) { if($key % 2 === 0) { $tempArr[$key] = bubbleSortAsc($value); } else { $tempArr[$key] = bubbleSortDesc($value); } } for($i = 0; $i < $colCount; $i++) { $columnArr[$i] = bubbleSort(array_column($tempArr, $i)); } for($i = 0; $i < $rowCount; $i++) { $tempArr[$i] = bubbleSort(array_column($columnArr, $i)); } $arr = $tempArr; } function bubbleSortAsc(array $arr) { $sorted = false; while (false === $sorted) { $sorted = true; for ($i = 0; $i < count($arr)-1; ++$i) { $current = $arr[$i]; $next = $arr[$i+1]; if ($next < $current) { $arr[$i] = $next; $arr[$i+1] = $current; $sorted = false; } } } return $arr; } function bubbleSortDesc(array $arr) { $sorted = false; while (false === $sorted) { $sorted = true; for ($i = 0; $i < count($arr)-1; ++$i) { $current = $arr[$i]; $next = $arr[$i+1]; if ($next > $current) { $arr[$i] = $next; $arr[$i+1] = $current; $sorted = false; } } } return $arr; } function bSort($arr) { bubbleSortRowCol($arr); return $arr; } print_r(bSort($arr));
based on QYlFg
Output for 7.0.0 - 7.1.7, 7.2.0
Fatal error: Uncaught Error: Call to undefined function bubbleSort() in /in/59aTg:25 Stack trace: #0 /in/59aTg(71): bubbleSortRowCol(Array) #1 /in/59aTg(76): bSort(Array) #2 {main} thrown in /in/59aTg on line 25
Process exited with code 255.
Output for 7.1.10

Process exited with code 137.
Output for 5.4.10 - 5.6.28
Fatal error: Call to undefined function bubbleSort() in /in/59aTg on line 25
Process exited with code 255.
Output for 5.3.20 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/59aTg on line 3
Process exited with code 255.