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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 = $this->sudokuColumns; foreach ($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) { $fields[(3 * ($columnIndex / 3)) + $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(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)
8.3.60.0190.00318.68
8.3.50.0120.00722.11
8.3.40.0090.00918.76
8.3.30.0110.00418.84
8.3.20.0050.00318.95
8.3.10.0030.00620.71
8.3.00.0040.00421.76
8.2.180.0180.00316.75
8.2.170.0060.00922.96
8.2.160.0150.00320.29
8.2.150.0030.00524.18
8.2.140.0030.00524.66
8.2.130.0090.00626.16
8.2.120.0080.00019.36
8.2.110.0080.00320.91
8.2.100.0040.00817.91
8.2.90.0030.00519.21
8.2.80.0030.00618.05
8.2.70.0030.00617.63
8.2.60.0090.00017.93
8.2.50.0000.00918.07
8.2.40.0000.00818.18
8.2.30.0060.00618.08
8.2.20.0040.00417.76
8.2.10.0000.00817.66
8.2.00.0050.00517.77
8.1.270.0050.00323.99
8.1.260.0000.00826.35
8.1.250.0040.00428.09
8.1.240.0040.01122.56
8.1.230.0040.00820.92
8.1.220.0060.00318.77
8.1.210.0040.00418.89
8.1.200.0000.01017.35
8.1.190.0000.00817.53
8.1.180.0000.00818.10
8.1.170.0000.00818.90
8.1.160.0040.00418.92
8.1.150.0040.00418.68
8.1.140.0080.00017.49
8.1.130.0040.00417.78
8.1.120.0070.00317.51
8.1.110.0020.00517.50
8.1.100.0040.00417.54
8.1.90.0080.00017.40
8.1.80.0050.00317.38
8.1.70.0000.00717.41
8.1.60.0080.00017.64
8.1.50.0030.00517.51
8.1.40.0040.00417.60
8.1.30.0000.00817.67
8.1.20.0000.00817.71
8.1.10.0040.00417.61
8.1.00.0040.00417.41
8.0.300.0000.00820.01
8.0.290.0080.00016.58
8.0.280.0030.00318.39
8.0.270.0020.00517.27
8.0.260.0000.00716.74
8.0.250.0000.00716.99
8.0.240.0030.00616.91
8.0.230.0060.00016.96
8.0.220.0030.00316.94
8.0.210.0000.00816.95
8.0.200.0030.00316.98
8.0.190.0030.00317.03
8.0.180.0000.00816.94
8.0.170.0090.00016.93
8.0.160.0040.00416.93
8.0.150.0030.00616.94
8.0.140.0040.00416.85
8.0.130.0030.00313.40
8.0.120.0000.00816.91
8.0.110.0040.00416.93
8.0.100.0050.00316.80
8.0.90.0030.00616.83
8.0.80.0060.01016.91
8.0.70.0000.00816.80
8.0.60.0000.00716.77
8.0.50.0040.00416.86
8.0.30.0070.01517.05
8.0.20.0100.00917.40
8.0.10.0000.00817.06
8.0.00.0110.00716.77
7.4.330.0060.00014.71
7.4.320.0000.00616.53
7.4.300.0070.00016.56
7.4.290.0030.00316.66
7.4.280.0040.00416.59
7.4.270.0000.00716.62
7.4.260.0030.00313.38
7.4.250.0050.00316.45
7.4.240.0040.00416.53
7.4.230.0030.00316.58
7.4.220.0070.01916.65
7.4.210.0070.00816.62
7.4.200.0030.00416.44
7.4.190.0000.00716.49
7.4.160.0100.00716.46
7.4.150.0150.00917.40
7.4.140.0100.01217.86
7.4.130.0090.01016.57
7.4.120.0080.00916.52
7.4.110.0080.00816.81
7.4.100.0120.00916.58
7.4.90.0070.01016.52
7.4.80.0030.01519.04
7.4.70.0110.00716.51
7.4.60.0120.00816.50
7.4.50.0000.00916.24
7.4.40.0030.01322.27
7.4.30.0030.01716.42
7.4.00.0030.01315.00
7.3.330.0000.00513.27
7.3.320.0000.00713.19
7.3.310.0000.00716.46
7.3.300.0030.00516.36
7.3.290.0150.00016.43
7.3.280.0090.01016.39
7.3.270.0120.00617.40
7.3.260.0070.01018.24
7.3.250.0160.00716.57
7.3.240.0060.01216.44
7.3.230.0070.01016.58
7.3.210.0060.01016.57
7.3.200.0100.00719.39
7.3.190.0070.01516.64
7.3.180.0100.01016.68
7.3.170.0140.00616.48
7.3.160.0120.00316.46
7.3.120.0000.01414.77
7.3.110.0030.00915.13
7.3.100.0040.01114.69
7.3.90.0070.00714.82
7.3.80.0070.00714.53
7.3.70.0030.00914.71
7.3.60.0040.00715.05
7.3.50.0000.01214.98
7.3.40.0080.00314.51
7.3.30.0000.01714.90
7.3.20.0100.00616.82
7.3.10.0080.00816.67
7.3.00.0060.01016.43
7.2.330.0130.00616.90
7.2.320.0100.00716.80
7.2.310.0070.01016.54
7.2.300.0100.01016.75
7.2.290.0160.00616.82
7.2.240.0030.01214.86
7.2.230.0040.01115.27
7.2.220.0110.00714.98
7.2.210.0000.01215.19
7.2.200.0070.00715.05
7.2.190.0030.01015.21
7.2.180.0090.00615.26
7.2.170.0040.01115.08
7.2.160.0070.00714.84
7.2.150.0070.00317.07
7.2.140.0090.00317.05
7.2.130.0070.01016.95
7.2.120.0090.00616.81
7.2.110.0120.00316.66
7.2.100.0060.00917.00
7.2.90.0070.01116.96
7.2.80.0030.01016.86
7.2.70.0090.00617.05
7.2.60.0110.00316.88
7.2.50.0000.01616.87
7.2.40.0090.00616.84
7.2.30.0000.01016.73
7.2.20.0070.01116.94
7.2.10.0000.01616.95
7.2.00.0030.00718.11
7.1.330.0000.00816.08
7.1.320.0000.01515.82
7.1.310.0060.01015.47
7.1.300.0070.01115.54
7.1.290.0060.00615.75
7.1.280.0040.01115.95
7.1.270.0080.00615.88
7.1.260.0090.00615.82
7.1.250.0030.01415.79
7.1.200.0060.00615.65
7.1.100.0000.00918.16
7.1.70.0000.01117.11
7.1.60.0120.00919.40
7.1.50.0060.01616.97
7.1.00.0000.06022.51
7.0.200.0070.00316.88
7.0.140.0100.07022.04
7.0.60.0100.07020.04
7.0.50.0030.05017.75
7.0.40.0030.04017.71
7.0.30.0030.04017.80
7.0.20.0070.03717.93
7.0.10.0070.03717.72
7.0.00.0000.04717.74
5.6.210.0100.08320.66
5.6.200.0070.05318.29
5.6.190.0000.04318.29
5.6.180.0000.04318.29
5.6.170.0070.03718.28
5.6.160.0030.04018.18
5.6.150.0000.04318.20
5.6.140.0070.07718.17
5.6.130.0030.04318.20
5.6.120.0030.08018.18
5.6.110.0100.04018.27
5.6.100.0030.04018.19
5.6.90.0030.04018.14
5.6.80.0070.03717.66
5.6.70.0030.03717.66
5.6.60.0070.03717.64
5.6.50.0070.04017.57
5.6.40.0030.04017.53
5.6.30.0100.03317.56
5.6.20.0030.03717.57
5.6.10.0070.03317.53
5.6.00.0030.04317.54
5.5.350.4130.04720.44
5.5.340.0070.06717.98
5.5.330.0070.03717.96
5.5.320.0070.03718.00
5.5.310.0030.04017.95
5.5.300.0030.04318.02
5.5.290.0130.07717.98
5.5.280.0030.08318.02
5.5.270.0030.08717.98
5.5.260.0070.04018.00
5.5.250.0000.04717.86
5.5.240.0070.03317.41
5.5.230.0030.05317.45
5.5.220.0030.03717.33
5.5.210.0000.04017.38
5.5.200.0000.04017.44
5.5.190.0000.04017.32
5.5.180.0000.04017.41
5.5.160.0130.03317.39
5.5.150.0030.03717.34
5.5.140.0030.04717.27
5.5.130.0000.04017.41
5.5.120.0200.04717.39
5.5.110.0070.07717.30
5.5.100.0100.06017.23
5.5.90.0100.08017.27
5.5.80.0100.05017.32
5.5.70.0100.05717.24
5.5.60.0100.04717.28
5.5.50.0470.05017.30
5.5.40.0030.05317.25
5.5.30.0070.06017.20
5.5.20.0030.05017.33
5.5.10.0070.06317.26
5.5.00.0070.08717.20
5.4.450.0030.04319.38
5.4.440.0070.07319.45
5.4.430.0000.04319.44
5.4.420.0000.04319.37
5.4.410.0030.04319.21
5.4.400.0030.03718.89
5.4.390.0100.03318.89
5.4.380.0030.03719.05
5.4.370.0070.03718.98
5.4.360.0030.03718.89
5.4.350.0000.04018.89
5.4.340.0000.04318.98
5.4.320.0100.03719.05
5.4.310.0100.03719.03
5.4.300.0070.03319.11
5.4.290.0130.03018.97
5.4.280.0130.06019.01
5.4.270.0230.03019.12
5.4.260.0070.06019.05
5.4.250.0130.06319.02
5.4.240.0030.07019.05
5.4.230.0030.08319.05
5.4.220.0000.04319.04
5.4.210.0070.03719.08
5.4.200.0030.04019.10
5.4.190.0030.06319.26
5.4.180.0030.05019.05
5.4.170.0100.07719.11
5.4.160.0100.07719.01
5.4.150.0030.04319.03
5.4.140.0070.03716.37
5.4.130.0000.05316.48
5.4.120.0100.03716.35
5.4.110.0070.07316.53
5.4.100.0130.04716.34
5.4.90.0200.06016.45
5.4.80.0070.07716.41
5.4.70.0070.06016.48
5.4.60.0100.06316.50
5.4.50.0130.06716.61
5.4.40.0100.05316.36
5.4.30.0030.05016.48
5.4.20.0170.06716.37
5.4.10.0100.05316.35
5.4.00.0070.06315.80
5.3.290.0030.03714.77
5.3.280.0030.08014.87
5.3.270.0070.08314.73
5.3.260.0070.08014.70
5.3.250.0000.08014.71
5.3.240.0000.04714.51
5.3.230.0070.04314.68
5.3.220.0100.04314.63
5.3.210.0100.03714.67
5.3.200.0130.06714.69
5.3.190.0070.08314.67
5.3.180.0100.04714.58
5.3.170.0100.07714.58
5.3.160.0070.06714.67
5.3.150.0030.08014.58
5.3.140.0070.04314.62
5.3.130.0130.05714.62
5.3.120.0100.07014.66
5.3.110.0100.07014.65
5.3.100.0070.05314.31
5.3.90.0070.05714.10
5.3.80.0100.07714.06
5.3.70.0100.06013.97
5.3.60.0130.07013.96
5.3.50.0170.06714.04
5.3.40.0070.07714.05
5.3.30.0030.04714.06
5.3.20.0030.04313.65
5.3.10.0000.05313.76
5.3.00.0030.07713.70
5.2.170.0030.05011.28
5.2.160.0030.05011.05
5.2.150.0000.04711.24
5.2.140.0100.04311.42
5.2.130.0070.03711.06
5.2.120.0000.06711.08
5.2.110.0130.05011.15
5.2.100.0000.04011.24
5.2.90.0030.03011.21
5.2.80.0030.03311.16
5.2.70.0070.06311.20
5.2.60.0030.06011.16
5.2.50.0070.06311.12
5.2.40.0000.06310.95
5.2.30.0030.05311.07
5.2.20.0100.02711.09
5.2.10.0130.05310.80
5.2.00.0200.05010.88
5.1.60.0030.04010.03
5.1.50.0070.03710.11
5.1.40.0030.03310.09
5.1.30.0070.05310.42
5.1.20.0130.04710.50
5.1.10.0100.03310.07
5.1.00.0130.04710.19
5.0.50.0070.0308.61
5.0.40.0070.0438.60
5.0.30.0000.0478.26
5.0.20.0030.0438.35
5.0.10.0030.0408.47
5.0.00.0070.0678.25
4.4.90.0070.0337.91
4.4.80.0030.0237.91
4.4.70.0130.0207.91
4.4.60.0030.0337.91
4.4.50.0070.0307.91
4.4.40.0030.0537.91
4.4.30.0000.0207.91
4.4.20.0130.0207.91
4.4.10.0000.0307.91
4.4.00.0130.0477.91
4.3.110.0070.0207.91
4.3.100.0100.0307.91
4.3.90.0130.0237.91
4.3.80.0130.0407.91
4.3.70.0030.0307.91
4.3.60.0000.0237.91
4.3.50.0000.0337.91
4.3.40.0030.0277.91
4.3.30.0000.0177.91
4.3.20.0030.0337.91
4.3.10.0000.0307.91
4.3.00.0000.0337.91

preferences:
57.21 ms | 400 KiB | 5 Q