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run code in 300+ PHP versions simultaneously
<?php class SudokuSolver { protected $sudokuColumns; public function __construct ($sudoku) { $this->sudokuColumns = $sudoku; } protected static function getNumbers () { return array_flip(str_split("123456789")); } // could be static as well public function printOut ($sudoku) { foreach ($sudoku as $column) { foreach ($column as $cell) { echo "|"; if (null !== $cell) { echo $cell; } else { echo " "; } } echo "|\n"; } } public function solve() { $this->checkConsistenz(); } protected function checkConsistenz () { $columns = $this->sudokuColumns; // check rows -> own method $rows = array(); foreach ($columns as $columnIndex => $column) { foreach ($column as $rowIndex => $cell) { $rows[$rowIndex][$columnIndex] = $cell; } //$this->printOut($rows); } foreach ($rows as $rowIndex => $row) { var_export($this->checkRow($rowIndex,$row)); } } protected function checkRow ($rowIndex, $row) { $numbers = self::getNumbers(); echo "checking $rowIndex..\n"; foreach ($row as $column) { if (null === $column) { continue; } //echo "$column , $numbers\n" . var_export(strpos($numbers,$column),true); if (!array_key_exists($column,$numbers)) { return false; } $numbers = unset($numbers[$column]); } return true; } } $sudoku = array(); $sudoku[] = array(null,3,null, null,null,null, null,null,null); $sudoku[] = array(null,null,null, 1,9,5, null,null,null); $sudoku[] = array(null,null,8, null,null,null, null,6,null); $sudoku[] = array(8,null,null, null,6,null, null,null,null); $sudoku[] = array(4,null,null, 8,null,null, null,null,1); $sudoku[] = array(null,null,null ,null,2,null, null,null,null); $sudoku[] = array(null,6,null, null,null,null, 2,8,null); $sudoku[] = array(null,null,null, 4,1,9, null,null,5); $sudoku[] = array(null,null,null, null,null,null, null,7,null); $sudokuSolver = new SudokuSolver($sudoku); //$sudokuSolver->printOut($sudoku); $sudokuSolver->solve($sudoku);

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
5.4.170.0250.06512.40
5.4.160.0160.04812.39
5.4.150.0180.04512.39
5.4.140.0190.03912.08
5.4.130.0160.04612.06
5.4.120.0180.04412.03
5.4.110.0320.05512.02
5.4.100.0160.04312.02
5.4.90.0150.04312.02
5.4.80.0210.03912.02
5.4.70.0210.06712.02
5.4.60.0270.06412.02
5.4.50.0140.04512.02
5.4.40.0170.04012.01
5.4.30.0150.04312.01
5.4.20.0220.06512.00
5.4.10.0220.05212.00
5.4.00.0180.04011.49
5.3.270.0210.05912.72
5.3.260.0210.04212.72
5.3.250.0190.04412.71
5.3.240.0170.04412.72
5.3.230.0200.05912.71
5.3.220.0220.04112.68
5.3.210.0150.04712.68
5.3.200.0180.04212.68
5.3.190.0140.04712.68
5.3.180.0170.04212.68
5.3.170.0160.04412.67
5.3.160.0190.04312.67
5.3.150.0290.07512.68
5.3.140.0210.05412.66
5.3.130.0190.05812.66
5.3.120.0210.05512.66
5.3.110.0190.04312.66
5.3.100.0190.04212.13
5.3.90.0140.04312.11
5.3.80.0140.04512.10
5.3.70.0190.04212.10
5.3.60.0160.04412.09
5.3.50.0190.04112.03
5.3.40.0200.05512.04
5.3.30.0140.04512.00
5.3.20.0160.04511.78
5.3.10.0150.04211.74
5.3.00.0150.04511.72

preferences:
145.42 ms | 1386 KiB | 7 Q