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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 $cell; } else { echo " "; } } echo "|\n"; } } public function solve() { if (!$this->checkConsistenz()) { throw new Exception("inconsistent data!"); } } protected function checkConsistenz () { $columns = $this->sudokuColumns; foreach ($columns as $columnIndex => $column) { if (!$this->checkLine($columnIndex,$column)) { return false; } } // 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 => $row) { if (!$this->checkLine($rowIndex,$row)) { return false; } } // check field -> own method $fields = array(); foreach ($columns as $columnIndex => $column) { foreach ($column as $rowIndex => $cell) { //echo "(3 * ($columnIndex / 3)) + ($rowIndex / 3) = ". (3 * ($columnIndex / 3)) ." + ". ($rowIndex / 3) ."\n"; $fields[(3 * intval($columnIndex / 3)) + intval($rowIndex / 3)][] = $cell; } } //print_r($fields); foreach ($rows as $rowIndex => $row) { if (!$this->checkLine($rowIndex,$row)) { return false; } } return true; } protected function checkLine ($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,$numbers)) { return false; } unset($numbers[$column]); } return true; } } $sudoku = array(); $sudoku[] = array(null,3,null, null,null,null, null,null,null); $sudoku[] = array(3,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)
8.3.60.0070.01418.55
8.3.50.0140.00521.99
8.3.40.0070.00718.79
8.3.30.0090.00618.79
8.3.20.0080.00018.76
8.3.10.0090.00021.23
8.3.00.0040.00423.56
8.2.180.0110.00716.63
8.2.170.0140.00022.96
8.2.160.0130.00020.53
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0080.00026.16
8.2.120.0040.00420.99
8.2.110.0040.00420.41
8.2.100.0090.00317.84
8.2.90.0030.00619.17
8.2.80.0040.00419.41
8.2.70.0000.00917.50
8.2.60.0060.00318.05
8.2.50.0030.00618.07
8.2.40.0060.00318.22
8.2.30.0040.00419.45
8.2.20.0000.00819.49
8.2.10.0000.00717.81
8.2.00.0040.00417.79
8.1.280.0130.00325.92
8.1.270.0080.00023.99
8.1.260.0050.00326.35
8.1.250.0060.00328.09
8.1.240.0070.00722.52
8.1.230.0110.00020.92
8.1.220.0040.00418.77
8.1.210.0080.00019.02
8.1.200.0030.00617.35
8.1.190.0060.00317.55
8.1.180.0000.00818.10
8.1.170.0030.00518.52
8.1.160.0040.00419.00
8.1.150.0000.00718.73
8.1.140.0030.00617.43
8.1.130.0040.00417.83
8.1.120.0040.00417.54
8.1.110.0050.00217.41
8.1.100.0040.00417.47
8.1.90.0000.00817.49
8.1.80.0040.00417.40
8.1.70.0000.00717.40
8.1.60.0040.00417.53
8.1.50.0000.00917.50
8.1.40.0040.00417.52
8.1.30.0050.00217.59
8.1.20.0000.00817.62
8.1.10.0050.00317.59
8.1.00.0060.00317.60
8.0.300.0000.00719.95
8.0.290.0000.00717.30
8.0.280.0040.00418.52
8.0.270.0030.00317.30
8.0.260.0000.00716.89
8.0.250.0020.00517.01
8.0.240.0040.00416.93
8.0.230.0000.00716.97
8.0.220.0040.00416.96
8.0.210.0000.00716.87
8.0.200.0060.00316.91
8.0.190.0000.00717.02
8.0.180.0000.00816.95
8.0.170.0040.00416.88
8.0.160.0050.00217.02
8.0.150.0040.00416.86
8.0.140.0000.00716.94
8.0.130.0000.00613.39
8.0.120.0000.00716.93
8.0.110.0030.00516.75
8.0.100.0000.00716.91
8.0.90.0000.00717.02
8.0.80.0030.01717.00
8.0.70.0040.00416.94
8.0.60.0000.00716.73
8.0.50.0040.00416.75
8.0.30.0090.00917.20
8.0.20.0100.01317.40
8.0.10.0000.00716.95
8.0.00.0090.00816.71
7.4.330.0050.00016.67
7.4.320.0000.00616.67
7.4.300.0050.00216.74
7.4.290.0030.00316.61
7.4.280.0000.00716.63
7.4.270.0040.00416.65
7.4.260.0030.00313.36
7.4.250.0030.00616.59
7.4.240.0070.00016.59
7.4.230.0030.00716.49
7.4.220.0150.00916.66
7.4.210.0090.00716.57
7.4.200.0050.00216.44
7.4.190.0000.00816.51
7.4.160.0140.01016.70
7.4.150.0110.00917.40
7.4.140.0100.00717.86
7.4.130.0090.01216.69
7.4.120.0080.01016.65
7.4.110.0270.03216.60
7.4.100.0080.01116.47
7.4.90.0090.00916.49
7.4.80.0080.00819.39
7.4.70.0000.02016.70
7.4.60.0070.01416.54
7.4.50.0040.00416.22
7.4.40.0070.00722.77
7.4.30.0130.01016.47
7.4.00.0070.01114.99
7.3.330.0000.00513.49
7.3.320.0000.00513.42
7.3.310.0050.00316.24
7.3.300.0080.00016.43
7.3.290.0140.00016.39
7.3.280.0100.00716.40
7.3.270.0130.00517.40
7.3.260.0130.00718.24
7.3.250.0100.01016.45
7.3.240.0110.00816.78
7.3.230.0140.00716.41
7.3.210.0100.01016.39
7.3.200.0100.01419.39
7.3.190.0110.00616.40
7.3.180.0140.00716.46
7.3.170.0160.00016.50
7.3.160.0120.00916.43
7.3.120.0070.00714.96
7.3.110.0110.00614.65
7.3.100.0120.00415.15
7.3.90.0070.01014.89
7.3.80.0030.01215.02
7.3.70.0130.00315.08
7.3.60.0000.01114.76
7.3.50.0040.01114.92
7.3.40.0030.01315.00
7.3.30.0110.00714.87
7.3.20.0000.01416.65
7.3.10.0040.00816.53
7.3.00.0100.00316.88
7.2.330.0070.01016.54
7.2.320.0090.00916.79
7.2.310.0120.00516.52
7.2.300.0120.00916.81
7.2.290.0100.00816.86
7.2.250.0100.01014.99
7.2.240.0130.00615.36
7.2.230.0110.00315.24
7.2.220.0110.00714.63
7.2.210.0070.00715.22
7.2.200.0070.01115.27
7.2.190.0080.00415.08
7.2.180.0070.00714.96
7.2.170.0060.01015.19
7.2.00.0060.00619.59
7.1.330.0070.01015.95
7.1.320.0060.00615.95
7.1.310.0060.00615.78
7.1.300.0030.01015.82
7.1.290.0100.00315.74
7.1.280.0090.00915.92
7.1.270.0060.01215.75
7.1.260.0060.01015.75
7.1.200.0100.00615.61
7.1.100.0250.00817.96
7.1.70.0090.00617.09
7.1.60.0060.00617.33
7.1.50.0100.01017.02
7.1.00.0030.03322.45
7.0.200.0030.01016.70
7.0.140.0000.07722.00
7.0.100.0370.08020.02
7.0.90.0270.07019.90
7.0.80.0100.08019.96
7.0.70.0200.06719.97
7.0.60.0200.08720.02
7.0.50.0200.05720.38
7.0.40.0030.07320.14
7.0.30.0100.05020.09
7.0.20.0130.08320.03
7.0.10.0000.08720.09
7.0.00.0100.07720.14
5.6.280.0030.07020.82
5.6.250.0070.09720.64
5.6.240.0170.07020.79
5.6.230.0070.05020.52
5.6.220.0000.06020.70
5.6.210.0100.06320.60
5.6.200.0070.09021.00
5.6.190.0100.08021.10
5.6.180.0070.07321.07
5.6.170.0100.05021.21
5.6.160.0030.04321.02
5.6.150.0030.07721.14
5.6.140.0070.04020.99
5.6.130.0030.05021.06
5.6.120.0130.08721.10
5.6.110.0030.06021.16
5.6.100.0030.08721.11
5.6.90.0100.08321.07
5.6.80.0000.05020.45
5.6.70.0070.08320.49
5.6.60.0130.07020.48
5.6.50.0030.07320.47
5.6.40.0030.08320.40
5.6.30.0030.06320.42
5.6.20.0000.08020.50
5.6.10.0130.04720.42
5.6.00.0030.08320.42
5.5.380.0170.06720.45
5.5.370.0070.07720.39
5.5.360.0100.07320.52
5.5.350.0030.08320.47
5.5.340.0170.04020.84
5.5.330.0100.05320.84
5.5.320.0130.06720.95
5.5.310.0030.08720.86
5.5.300.0070.07020.97
5.5.290.0130.07720.86
5.5.280.0100.07320.94
5.5.270.0100.07720.94
5.5.260.0100.07720.84
5.5.250.0030.06320.73
5.5.240.0070.07320.32
5.5.230.0100.08320.33
5.5.220.0100.07320.02
5.5.210.0100.07720.18
5.5.200.0070.05320.16
5.5.190.0230.05720.23
5.5.180.0170.06720.15
5.5.160.0070.06020.12
5.5.150.0100.09320.31
5.5.140.0100.04320.27
5.5.130.0070.07720.27
5.5.120.0030.06720.23
5.5.110.0130.04020.23
5.5.100.0030.07720.02
5.5.90.0030.03720.16
5.5.80.0030.07019.98
5.5.70.0030.05020.04
5.5.60.0100.07020.10
5.5.50.0070.06320.16
5.5.40.0070.06020.18
5.5.30.0100.03720.09
5.5.20.0000.08320.14
5.5.10.0130.06720.06
5.5.00.0130.07020.00
5.4.450.0000.08019.21
5.4.440.0030.05019.27
5.4.430.0100.08019.41
5.4.420.0170.04019.37
5.4.410.0070.07319.14
5.4.400.0100.07719.06
5.4.390.0100.07319.13
5.4.380.0070.07718.84
5.4.370.0230.05719.03
5.4.360.0130.07319.25
5.4.350.0100.07719.21
5.4.340.0000.08318.97
5.4.320.0000.06019.04
5.4.310.0030.07718.95
5.4.300.0070.08018.95
5.4.290.0100.06319.07
5.4.280.0170.09019.12
5.4.270.0030.05718.94
5.4.260.0130.06318.94
5.4.250.0070.05019.11
5.4.240.0070.07318.94
5.4.230.0100.06718.94
5.4.220.0130.07019.02
5.4.210.0070.04319.24
5.4.200.0100.07018.89
5.4.190.0070.04019.15
5.4.180.0030.03319.11
5.4.170.0030.04019.02
5.4.160.0100.06018.88
5.4.150.0070.05319.05
5.4.140.0130.05316.34
5.4.130.0030.03316.42
5.4.120.0070.04316.44
5.4.110.0170.06316.52
5.4.100.0100.04716.42
5.4.90.0070.07016.49
5.4.80.0100.05716.51
5.4.70.0030.03316.39
5.4.60.0000.07716.39
5.4.50.0030.07016.48
5.4.40.0100.07716.39
5.4.30.0070.06016.51
5.4.20.0000.06016.46
5.4.10.0070.07016.50
5.4.00.0100.05315.89
5.3.290.0070.04014.79
5.3.280.0030.07714.58
5.3.270.0100.06014.78
5.3.260.0000.04014.76
5.3.250.0130.06714.79
5.3.240.0100.03014.62
5.3.230.0000.04014.74
5.3.220.0030.04714.61
5.3.210.0030.03714.63
5.3.200.0030.03714.61
5.3.190.0030.04014.77
5.3.180.0100.06314.73
5.3.170.0030.07714.77
5.3.160.0100.03014.59
5.3.150.0070.06714.69
5.3.140.0100.06314.61
5.3.130.0070.08314.75
5.3.120.0070.05314.68
5.3.110.0130.03014.67
5.3.100.0000.04014.05
5.3.90.0100.07314.09
5.3.80.0070.03013.96
5.3.70.0030.05014.11
5.3.60.0070.07014.11
5.3.50.0030.04014.07
5.3.40.0030.07714.10
5.3.30.0100.07014.00
5.3.20.0100.07313.76
5.3.10.0100.04013.63
5.3.00.0000.03713.69
5.2.170.0030.07311.68
5.2.160.0070.04711.68
5.2.150.0030.06011.68
5.2.140.0030.03711.68
5.2.130.0030.04311.68
5.2.120.0030.03011.68
5.2.110.0130.04711.68
5.2.100.0030.06311.68
5.2.90.0100.04711.68
5.2.80.0030.05711.68
5.2.70.0100.03311.68
5.2.60.0000.04011.68
5.2.50.0070.06311.68
5.2.40.0030.02311.68
5.2.30.0000.06311.68
5.2.20.0000.05311.68
5.2.10.0070.03311.68
5.2.00.0000.05011.68
5.1.60.0070.04311.68
5.1.50.0000.05711.68
5.1.40.0030.05311.68
5.1.30.0070.03011.68
5.1.20.0030.03711.68
5.1.10.0030.05711.68
5.1.00.0030.03011.68
5.0.50.0000.03311.68
5.0.40.0030.04011.68
5.0.30.0030.06311.68
5.0.20.0030.03311.68
5.0.10.0030.04011.68
5.0.00.0000.05311.68
4.4.90.0030.03311.68
4.4.80.0000.01311.68
4.4.70.0030.03311.68
4.4.60.0030.02311.68
4.4.50.0000.01311.68
4.4.40.0000.02711.68
4.4.30.0030.01711.68
4.4.20.0070.01711.68
4.4.10.0030.02711.68
4.4.00.0000.02311.68
4.3.110.0030.03011.68
4.3.100.0130.02011.68
4.3.90.0100.02011.68
4.3.80.0000.02311.68
4.3.70.0030.01711.68
4.3.60.0000.03311.68
4.3.50.0000.02711.68
4.3.40.0000.03311.68
4.3.30.0070.01011.68
4.3.20.0000.03711.68
4.3.10.0000.02711.68
4.3.00.0000.03711.68

preferences:
70.8 ms | 401 KiB | 5 Q