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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) { $fields[$rowIndex / 3][$columnIndex / 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)
8.3.60.0150.00316.63
8.3.50.0110.00921.97
8.3.40.0130.00318.93
8.3.30.0060.00919.27
8.3.20.0040.00420.01
8.3.10.0050.00323.64
8.3.00.0080.00019.50
8.2.180.0030.01316.75
8.2.170.0040.01822.96
8.2.160.0100.00720.35
8.2.150.0050.00324.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0030.00522.21
8.2.110.0070.00419.27
8.2.100.0090.00317.84
8.2.90.0080.00019.21
8.2.80.0030.00817.97
8.2.70.0040.00417.63
8.2.60.0060.00318.04
8.2.50.0050.00318.10
8.2.40.0050.00319.88
8.2.30.0000.00818.23
8.2.20.0040.00417.77
8.2.10.0040.00418.15
8.2.00.0040.00417.89
8.1.280.0150.00025.92
8.1.270.0070.00324.01
8.1.260.0040.00426.35
8.1.250.0000.00828.09
8.1.240.0110.00022.31
8.1.230.0090.00317.77
8.1.220.0000.00817.74
8.1.210.0040.00418.77
8.1.200.0090.00017.47
8.1.190.0000.00817.22
8.1.180.0030.00618.10
8.1.170.0000.00818.63
8.1.160.0040.00422.09
8.1.150.0050.00318.66
8.1.140.0000.00817.48
8.1.130.0020.00517.73
8.1.120.0000.00717.41
8.1.110.0030.00617.39
8.1.100.0030.00517.39
8.1.90.0040.00417.45
8.1.80.0000.00717.48
8.1.70.0030.00517.48
8.1.60.0100.00317.53
8.1.50.0060.00317.56
8.1.40.0060.00317.61
8.1.30.0060.00317.61
8.1.20.0000.00817.70
8.1.10.0040.00417.60
8.1.00.0000.01017.45
8.0.300.0040.00418.77
8.0.290.0030.00616.88
8.0.280.0000.00718.52
8.0.270.0000.00717.25
8.0.260.0000.00717.17
8.0.250.0050.00216.98
8.0.240.0040.00416.92
8.0.230.0040.00416.89
8.0.220.0030.00316.93
8.0.210.0080.00016.93
8.0.200.0070.00016.88
8.0.190.0040.00416.97
8.0.180.0000.01016.87
8.0.170.0060.00316.82
8.0.160.0080.00016.81
8.0.150.0000.00716.89
8.0.140.0040.00416.93
8.0.130.0000.00713.32
8.0.120.0050.00316.80
8.0.110.0000.00817.00
8.0.100.0030.00516.93
8.0.90.0070.00016.84
8.0.80.0090.01216.89
8.0.70.0000.00716.82
8.0.60.0030.00716.76
8.0.50.0040.00416.82
8.0.30.0100.01317.14
8.0.20.0080.01117.40
8.0.10.0040.00417.07
8.0.00.0220.00516.87
7.4.330.0030.00315.02
7.4.320.0070.00016.46
7.4.300.0040.00416.53
7.4.290.0000.00716.68
7.4.280.0060.00316.56
7.4.270.0080.00016.53
7.4.260.0000.00716.55
7.4.250.0040.00416.54
7.4.240.0040.00416.61
7.4.230.0000.00716.64
7.4.220.0090.00916.72
7.4.210.0090.00816.58
7.4.200.0000.00716.30
7.4.190.0000.00716.70
7.4.160.0100.01016.56
7.4.150.0120.00617.40
7.4.140.0120.00517.86
7.4.130.0090.00916.58
7.4.120.0110.00816.65
7.4.110.0110.00716.59
7.4.100.0110.01116.58
7.4.90.0000.02116.59
7.4.80.0080.01119.39
7.4.70.0100.01416.57
7.4.60.0070.01016.42
7.4.50.0030.00616.58
7.4.40.0060.01116.49
7.4.30.0120.01216.43
7.4.10.0060.01215.01
7.4.00.0060.01015.02
7.3.330.0000.00813.27
7.3.320.0060.00013.34
7.3.310.0000.00716.30
7.3.300.0070.00016.29
7.3.290.0070.00716.38
7.3.280.0120.00616.38
7.3.270.0110.00717.40
7.3.260.0090.00916.41
7.3.250.0110.01216.62
7.3.240.0080.01116.31
7.3.230.0150.00416.47
7.3.210.0170.00716.73
7.3.200.0100.01319.39
7.3.190.0130.01016.31
7.3.180.0100.01116.57
7.3.170.0160.00616.59
7.3.160.0100.01016.52
7.3.130.0100.01014.58
7.3.120.0110.00514.89
7.3.110.0090.01114.78
7.3.100.0080.00514.77
7.3.90.0060.00814.83
7.3.80.0090.00514.85
7.3.70.0070.01014.81
7.3.60.0080.00714.79
7.3.50.0100.00314.88
7.3.40.0030.01214.87
7.3.30.0020.01014.85
7.3.20.0050.00716.74
7.3.10.0080.00516.69
7.3.00.0020.01016.75
7.2.330.0060.01316.68
7.2.320.0090.01216.68
7.2.310.0150.01116.77
7.2.300.0120.00916.86
7.2.290.0140.01116.72
7.2.260.0000.01914.83
7.2.250.0070.01415.04
7.2.240.0060.01015.21
7.2.230.0020.01415.11
7.2.220.0040.01015.15
7.2.210.0050.00915.14
7.2.200.0050.01215.15
7.2.190.0060.00814.96
7.2.180.0070.00715.04
7.2.170.0030.01015.11
7.2.160.0000.01315.00
7.2.150.0090.00917.07
7.2.140.0030.01217.02
7.2.130.0060.00317.01
7.2.120.0030.01216.98
7.2.110.0100.01016.97
7.2.100.0040.01517.09
7.2.90.0060.00616.94
7.2.80.0100.00316.76
7.2.70.0100.00316.75
7.2.60.0000.01216.87
7.2.50.0070.00717.05
7.2.40.0070.01117.13
7.2.30.0030.01216.95
7.2.20.0070.00716.93
7.2.10.0030.01017.01
7.2.00.0090.00618.15
7.1.330.0020.01415.71
7.1.320.0060.00815.62
7.1.310.0110.00515.86
7.1.300.0030.01115.83
7.1.290.0050.00915.80
7.1.280.0050.01015.69
7.1.270.0030.01115.66
7.1.260.0080.00515.77
7.1.250.0000.01115.75
7.1.240.0030.00915.88
7.1.230.0090.00915.56
7.1.220.0080.00615.95
7.1.210.0060.00615.46
7.1.200.0040.01115.69
7.1.190.0060.00315.60
7.1.180.0000.01015.95
7.1.170.0000.01415.75
7.1.160.0040.01415.89
7.1.150.0030.01315.76
7.1.140.0060.00315.57
7.1.130.0070.00715.80
7.1.120.0030.01015.64
7.1.110.0090.00916.05
7.1.100.0090.00417.05
7.1.90.0000.01215.99
7.1.80.0060.00915.93
7.1.70.0060.00516.08
7.1.60.0050.00716.40
7.1.50.0090.00916.33
7.1.40.0030.00615.89
7.1.30.0060.00615.78
7.1.20.0040.01115.88
7.1.10.0070.01015.55
7.1.00.0000.04418.90
7.0.330.0030.00915.52
7.0.320.0040.01515.32
7.0.310.0030.01315.39
7.0.300.0060.01015.10
7.0.290.0120.00615.50
7.0.280.0030.00715.19
7.0.270.0090.00615.41
7.0.260.0060.00915.36
7.0.250.0110.01115.50
7.0.240.0060.00915.61
7.0.230.0080.00815.66
7.0.220.0130.00315.60
7.0.210.0140.00015.52
7.0.200.0100.00316.02
7.0.190.0060.00915.40
7.0.180.0070.00415.36
7.0.170.0070.00715.59
7.0.160.0120.00615.48
7.0.150.0100.00715.46
7.0.140.0070.04118.71
7.0.130.0030.01315.59
7.0.120.0030.01315.36
7.0.110.0060.01015.23
7.0.100.0120.00315.55
7.0.90.0070.00715.45
7.0.80.0060.00915.24
7.0.70.0050.04718.58
7.0.60.0050.04318.60
7.0.50.0070.04618.61
7.0.40.0100.04316.82
7.0.30.0090.04216.71
7.0.20.0090.04116.78
7.0.10.0050.03616.87
7.0.00.0050.04916.75
5.6.400.0090.00614.59
5.6.390.0120.00614.82
5.6.380.0100.00714.76
5.6.370.0000.01214.37
5.6.360.0030.01714.80
5.6.350.0040.00714.63
5.6.340.0130.00614.52
5.6.330.0060.01214.73
5.6.320.0070.01514.65
5.6.310.0150.00314.58
5.6.300.0030.01614.62
5.6.290.0110.00314.70
5.6.280.0100.04017.86
5.6.270.0160.00014.54
5.6.260.0000.01414.85
5.6.250.0100.00614.68
5.6.240.0070.00714.82
5.6.230.0100.00714.36
5.6.220.0050.03517.64
5.6.210.0060.04517.53
5.6.200.0130.03817.75
5.6.190.0080.04717.78
5.6.180.0130.02817.95
5.6.170.0100.04717.98
5.6.160.0150.04317.80
5.6.150.0090.04417.82
5.6.140.0070.04117.76
5.6.130.0140.04017.77
5.6.120.0070.04617.89
5.6.110.0090.04317.68
5.6.100.0050.04917.86
5.6.90.0020.05517.78
5.6.80.0080.03117.51
5.6.70.0120.03817.56
5.6.60.0040.02817.39
5.6.50.0030.04817.37
5.6.40.0020.03417.43
5.6.30.0020.04617.41
5.6.20.0030.04717.36
5.6.10.0030.04317.53
5.6.00.0030.04517.52
5.5.380.0100.01014.63
5.5.370.0080.01114.67
5.5.360.0050.04817.35
5.5.350.0070.04117.30
5.5.340.0050.04617.81
5.5.330.0090.02617.68
5.5.320.0080.03317.78
5.5.310.0070.04717.61
5.5.300.0090.04217.65
5.5.290.0080.04217.65
5.5.280.0030.05217.64
5.5.270.0100.02817.71
5.5.260.0050.02817.83
5.5.250.0080.04217.72
5.5.240.0030.04517.36
5.5.230.0080.04017.48
5.5.220.0030.02517.25
5.5.210.0050.03717.39
5.5.200.0130.03817.36
5.5.190.0050.04717.38
5.5.180.0080.04417.38
5.5.170.0100.00314.38
5.5.160.0070.04217.21
5.5.150.0070.04517.54
5.5.140.0100.04317.36
5.5.130.0060.03017.45
5.5.120.0120.04217.30
5.5.110.0110.04017.40
5.5.100.0070.04317.33
5.5.90.0100.03817.28
5.5.80.0110.03617.30
5.5.70.0040.04617.29
5.5.60.0070.04317.37
5.5.50.0090.03117.28
5.5.40.0090.03817.26
5.5.30.0100.02317.17
5.5.20.0080.04117.30
5.5.10.0090.03317.31
5.5.00.0070.03817.12
5.4.450.0080.04315.47
5.4.440.0070.04715.52
5.4.430.0070.03315.39
5.4.420.0050.03715.53
5.4.410.0050.04715.45
5.4.400.0080.02315.37
5.4.390.0100.03315.41
5.4.380.0040.03915.30
5.4.370.0090.02215.35
5.4.360.0100.03015.39
5.4.350.0030.04015.24
5.4.340.0130.03815.30
5.4.330.0130.00311.57
5.4.320.0090.03815.31
5.4.310.0050.02515.34
5.4.300.0080.03815.30
5.4.290.0070.04015.22
5.4.280.0060.03815.24
5.4.270.0050.03015.22
5.4.260.0000.04215.30
5.4.250.0050.04215.40
5.4.240.0110.03015.21
5.4.230.0090.04015.21
5.4.220.0090.04215.33
5.4.210.0080.03515.22
5.4.200.0040.03115.35
5.4.190.0100.04015.33
5.4.180.0060.03515.21
5.4.170.0030.04315.30
5.4.160.0050.04015.20
5.4.150.0060.04415.30
5.4.140.0050.04114.06
5.4.130.0060.03114.02
5.4.120.0020.03114.04
5.4.110.0030.04114.01
5.4.100.0050.04313.99
5.4.90.0120.03214.05
5.4.80.0080.03614.05
5.4.70.0100.03814.04
5.4.60.0120.03814.00
5.4.50.0020.04514.05
5.4.40.0100.03714.05
5.4.30.0100.03713.99
5.4.20.0020.04513.96
5.4.10.0070.04214.04
5.4.00.0070.03013.80
5.3.290.0110.03313.13
5.3.280.0100.03813.10
5.3.270.0000.04413.08
5.3.260.0070.04513.12
5.3.250.0030.04413.18
5.3.240.0080.03813.11
5.3.230.0030.03813.18
5.3.220.0050.03813.12
5.3.210.0060.03813.15
5.3.200.0080.02013.09
5.3.190.0080.04013.09
5.3.180.0060.04013.12
5.3.170.0050.04213.07
5.3.160.0040.03913.06
5.3.150.0050.04313.06
5.3.140.0070.04213.16
5.3.130.0040.04413.09
5.3.120.0110.03813.13
5.3.110.0100.03013.15
5.3.100.0040.04412.88
5.3.90.0040.02412.79
5.3.80.0090.03712.79
5.3.70.0080.02512.83
5.3.60.0030.04212.88
5.3.50.0050.04012.79
5.3.40.0080.03512.75
5.3.30.0060.03812.80
5.3.20.0020.03412.68
5.3.10.0070.04012.59
5.3.00.0100.04012.70
5.2.170.0000.06013.51
5.2.160.0000.06313.51
5.2.150.0030.06713.51
5.2.140.0070.06313.51
5.2.130.0000.05313.51
5.2.120.0030.06313.51
5.2.110.0070.06013.51
5.2.100.0100.05713.51
5.2.90.0100.05313.51
5.2.80.0030.04013.51
5.2.70.0030.06713.51
5.2.60.0030.06313.51
5.2.50.0070.04313.51
5.2.40.0030.06313.51
5.2.30.0030.06713.51
5.2.20.0130.05013.51
5.2.10.0030.03013.51
5.2.00.0030.06013.51
5.1.60.0000.05713.51
5.1.50.0000.04013.51
5.1.40.0030.05313.51
5.1.30.0030.06013.51
5.1.20.0030.05313.51
5.1.10.0000.02713.51
5.1.00.0030.05313.51
5.0.50.0030.03713.51
5.0.40.0030.01713.51
5.0.30.0030.05013.51
5.0.20.0000.04013.51
5.0.10.0030.04713.51
5.0.00.0030.04313.51
4.4.90.0070.02713.51
4.4.80.0000.04013.51
4.4.70.0000.03313.51
4.4.60.0000.02013.51
4.4.50.0000.02313.51
4.4.40.0000.05313.51
4.4.30.0000.03713.51
4.4.20.0000.02313.51
4.4.10.0000.03013.51
4.4.00.0030.02013.51
4.3.110.0000.02313.51
4.3.100.0000.03313.51
4.3.90.0000.03013.51
4.3.80.0000.02013.51
4.3.70.0070.02713.51
4.3.60.0070.03713.51
4.3.50.0000.03313.51
4.3.40.0000.05713.51
4.3.30.0000.04013.51
4.3.20.0030.02713.51
4.3.10.0000.03713.51
4.3.00.0000.03013.51

preferences:
55.2 ms | 401 KiB | 5 Q