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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(null,3,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)
8.3.60.0000.01516.75
8.3.50.0160.00522.07
8.3.40.0060.01019.01
8.3.30.0060.00919.20
8.3.20.0030.00620.33
8.3.10.0080.00023.54
8.3.00.0040.00419.50
8.2.180.0080.01516.75
8.2.170.0140.00422.96
8.2.160.0030.01020.34
8.2.150.0050.00324.18
8.2.140.0000.00824.66
8.2.130.0090.00926.16
8.2.120.0000.00822.29
8.2.110.0090.00022.15
8.2.100.0110.00017.97
8.2.90.0000.00819.17
8.2.80.0000.00817.97
8.2.70.0030.00617.88
8.2.60.0000.00817.93
8.2.50.0030.00518.07
8.2.40.0030.00618.09
8.2.30.0000.00718.19
8.2.20.0020.00517.93
8.2.10.0040.00418.30
8.2.00.0060.00317.91
8.1.280.0040.01125.92
8.1.270.0080.00022.17
8.1.260.0080.00026.35
8.1.250.0040.00428.09
8.1.240.0000.00923.86
8.1.230.0000.01019.23
8.1.220.0000.00817.77
8.1.210.0080.00018.77
8.1.200.0060.00317.25
8.1.190.0060.00317.66
8.1.180.0080.00018.10
8.1.170.0050.00318.50
8.1.160.0020.00522.01
8.1.150.0050.00318.70
8.1.140.0040.00417.42
8.1.130.0030.00317.98
8.1.120.0050.00317.38
8.1.110.0000.00717.40
8.1.100.0040.00417.50
8.1.90.0030.00617.48
8.1.80.0040.00417.55
8.1.70.0050.00317.39
8.1.60.0040.00417.65
8.1.50.0060.00317.58
8.1.40.0040.00417.48
8.1.30.0030.00517.56
8.1.20.0050.00517.58
8.1.10.0030.00517.59
8.1.00.0030.00617.49
8.0.300.0070.00018.77
8.0.290.0070.00017.30
8.0.280.0070.00018.44
8.0.270.0080.00017.34
8.0.260.0030.00316.98
8.0.250.0000.00816.95
8.0.240.0040.00417.11
8.0.230.0040.00417.03
8.0.220.0000.00716.88
8.0.210.0030.00317.05
8.0.200.0000.00717.01
8.0.190.0050.00317.12
8.0.180.0000.00816.96
8.0.170.0030.00616.89
8.0.160.0000.00717.03
8.0.150.0040.00416.94
8.0.140.0040.00416.99
8.0.130.0030.00613.45
8.0.120.0040.00416.95
8.0.110.0000.00816.93
8.0.100.0070.00016.81
8.0.90.0050.00316.89
8.0.80.0070.01117.05
8.0.70.0050.00316.97
8.0.60.0000.00716.85
8.0.50.0000.00817.01
8.0.30.0100.00817.02
8.0.20.0030.01517.40
8.0.10.0080.00017.02
8.0.00.0070.01016.77
7.4.330.0060.00015.03
7.4.320.0060.00016.67
7.4.300.0030.00316.54
7.4.290.0030.00316.55
7.4.280.0030.00316.65
7.4.270.0030.00316.58
7.4.260.0000.00716.58
7.4.250.0000.00816.52
7.4.240.0000.00716.52
7.4.230.0070.00016.40
7.4.220.0150.01216.75
7.4.210.0080.01116.60
7.4.200.0030.00316.45
7.4.190.0040.00416.73
7.4.160.0110.00816.56
7.4.150.0060.01217.40
7.4.140.0070.01017.86
7.4.130.0080.01016.59
7.4.120.0080.01016.64
7.4.110.0090.00916.63
7.4.100.0120.01216.63
7.4.90.0090.00916.39
7.4.80.0090.00919.39
7.4.70.0110.00616.71
7.4.60.0040.01216.67
7.4.50.0080.00016.21
7.4.40.0060.00922.77
7.4.30.0100.01016.64
7.4.00.0100.00615.01
7.3.330.0000.00513.27
7.3.320.0050.00013.48
7.3.310.0040.00416.58
7.3.300.0070.00016.50
7.3.290.0100.00616.41
7.3.280.0060.01016.51
7.3.270.0070.01117.40
7.3.260.0080.01116.54
7.3.250.0130.00916.47
7.3.240.0140.00316.72
7.3.230.0060.01116.59
7.3.210.0090.00916.45
7.3.200.0110.00619.39
7.3.190.0080.01116.42
7.3.180.0070.01116.43
7.3.170.0140.00316.64
7.3.160.0090.01516.65
7.3.120.0100.00714.93
7.2.330.0090.01516.48
7.2.320.0060.01316.89
7.2.310.0030.01316.71
7.2.300.0060.01216.45
7.2.290.0130.01016.83
7.2.60.0100.00317.00
7.2.00.0040.00719.42
7.1.200.0040.01115.95
7.1.100.0100.00718.18
7.1.70.0030.00617.06
7.1.60.0040.02119.33
7.1.50.0040.01517.10
7.1.00.0070.07322.57
7.0.200.0050.00516.94
7.0.140.0000.07722.08
7.0.110.0000.08319.96
7.0.100.0200.07020.05
7.0.90.0130.04719.98
7.0.80.0030.04319.91
7.0.70.0070.08320.02
7.0.60.0030.04720.07
7.0.50.0030.05019.96
7.0.40.0070.03719.85
7.0.30.0100.06319.88
7.0.20.0130.07719.86
7.0.10.0100.06719.79
7.0.00.0170.07319.65
5.6.280.0030.07720.93
5.6.260.0070.08020.78
5.6.250.0000.05020.75
5.6.240.0100.08020.72
5.6.230.0070.06020.59
5.6.220.0100.07320.60
5.6.210.0070.08320.63
5.6.200.0070.06720.70
5.6.190.0100.07720.59
5.6.180.0000.05320.51
5.6.170.0070.07720.66
5.6.160.0130.07720.59
5.6.150.0100.07720.69
5.6.140.0100.08720.60
5.6.130.0130.07020.68
5.6.120.0070.03720.52
5.6.110.0170.07320.68
5.6.100.0030.08320.48
5.6.90.0100.06320.72
5.6.80.0130.02720.08
5.6.70.0000.08320.09
5.6.60.0000.04320.05
5.6.50.0100.07020.07
5.6.40.0100.07020.04
5.6.30.0070.07320.04
5.6.20.0100.07720.07
5.6.10.0100.07320.04
5.6.00.0000.05320.03
5.5.380.0100.04017.55
5.5.370.0130.07017.55
5.5.360.0030.04317.61
5.5.350.0000.05017.63
5.5.340.0100.04718.05
5.5.330.0100.08318.10
5.5.320.0070.06018.26
5.5.310.0030.08317.93
5.5.300.0000.08018.23
5.5.290.0030.04717.95
5.5.280.0030.08318.09
5.5.270.0100.06717.83
5.5.260.0000.07317.92
5.5.250.0170.07018.04
5.5.240.0070.06717.48
5.5.230.0100.07317.48
5.5.220.0070.06017.47
5.5.210.0130.07317.49
5.5.200.0170.06717.30
5.5.190.0100.07317.57
5.5.180.0170.07317.60
5.5.160.0070.07717.60
5.5.150.0070.07717.58
5.5.140.0100.07317.33
5.5.130.0130.07317.28
5.5.120.0070.07017.43
5.5.110.0030.07317.27
5.5.100.0070.08017.48
5.5.90.0030.07317.47
5.5.80.0070.07717.35
5.5.70.0100.07717.15
5.5.60.0070.07317.10
5.5.50.0130.04017.34
5.5.40.0170.06317.19
5.5.30.0030.08017.35
5.5.20.0130.07317.09
5.5.10.0130.07017.55
5.5.00.0070.07717.33
5.4.450.0000.06019.64
5.4.440.0070.07719.51
5.4.430.0030.03719.58
5.4.420.0100.05319.33
5.4.410.0000.07319.38
5.4.400.0100.06018.95
5.4.390.0000.08019.16
5.4.380.0030.07019.16
5.4.370.0030.07719.23
5.4.360.0200.06719.26
5.4.350.0130.06719.01
5.4.340.0100.07318.98
5.4.320.0100.06319.23
5.4.310.0100.07319.34
5.4.300.0070.07719.34
5.4.290.0070.04319.34
5.4.280.0070.07018.98
5.4.270.0200.06319.23
5.4.260.0030.08719.03
5.4.250.0070.07719.22
5.4.240.0030.08019.01
5.4.230.0100.06718.98
5.4.220.0070.08019.17
5.4.210.0030.07719.22
5.4.200.0070.07719.00
5.4.190.0070.07719.16
5.4.180.0170.04319.18
5.4.170.0000.08018.99
5.4.160.0170.06718.93
5.4.150.0070.06319.16
5.4.140.0100.05716.44
5.4.130.0030.05716.59
5.4.120.0000.06716.60
5.4.110.0070.06016.71
5.4.100.0070.05316.38
5.4.90.0070.06716.65
5.4.80.0030.03016.50
5.4.70.0130.05316.46
5.4.60.0070.03016.47
5.4.50.0000.06016.61
5.4.40.0000.05016.50
5.4.30.0070.02716.44
5.4.20.0000.03716.59
5.4.10.0000.04316.49
5.4.00.0030.03315.83
5.3.290.0070.08314.75
5.3.280.0030.07714.74
5.3.270.0070.07014.75
5.3.260.0030.07714.67
5.3.250.0100.05014.89
5.3.240.0030.07314.52
5.3.230.0130.05714.80
5.3.220.0070.07314.58
5.3.210.0030.04714.75
5.3.200.0030.04314.66
5.3.190.0100.04714.77
5.3.180.0070.07314.76
5.3.170.0030.03314.76
5.3.160.0130.06314.63
5.3.150.0070.07014.65
5.3.140.0100.06714.69
5.3.130.0070.03314.84
5.3.120.0070.04314.61
5.3.110.0070.06714.58
5.3.100.0000.04014.11
5.3.90.0030.04014.09
5.3.80.0000.03314.05
5.3.70.0030.03714.05
5.3.60.0000.04014.09
5.3.50.0030.03713.86
5.3.40.0000.04014.14
5.3.30.0030.03713.98
5.3.20.0000.03713.75
5.3.10.0000.03713.85
5.3.00.0000.03713.82
5.2.170.0000.03013.04
5.2.160.0000.03013.04
5.2.150.0000.03013.04
5.2.140.0000.03013.04
5.2.130.0000.03013.04
5.2.120.0070.03013.04
5.2.110.0030.02713.04
5.2.100.0070.02713.04
5.2.90.0030.02313.04
5.2.80.0030.03013.04
5.2.70.0100.05713.04
5.2.60.0100.05013.04
5.2.50.0070.06713.04
5.2.40.0030.03013.04
5.2.30.0030.02713.04
5.2.20.0030.04313.04
5.2.10.0000.02713.04
5.2.00.0100.05313.04
5.1.60.0030.05013.04
5.1.50.0030.02013.04
5.1.40.0130.04013.04
5.1.30.0000.04313.04
5.1.20.0100.03713.04
5.1.10.0000.02713.04
5.1.00.0000.02313.04
5.0.50.0000.03313.04
5.0.40.0030.01713.04
5.0.30.0000.03013.04
5.0.20.0000.02013.04
5.0.10.0000.02013.04
5.0.00.0000.03313.04
4.4.90.0000.01313.04
4.4.80.0000.02013.04
4.4.70.0000.01313.04
4.4.60.0000.01313.04
4.4.50.0000.03013.04
4.4.40.0000.05313.04
4.4.30.0000.03713.04
4.4.20.0030.01713.04
4.4.10.0070.02713.04
4.4.00.0000.02713.04
4.3.110.0000.01313.04
4.3.100.0000.01313.04
4.3.90.0000.01313.04
4.3.80.0000.02313.04
4.3.70.0030.01313.04
4.3.60.0000.01713.04
4.3.50.0000.01713.04
4.3.40.0000.02013.04
4.3.30.0030.01013.04
4.3.20.0000.01313.04
4.3.10.0000.01313.04
4.3.00.0000.01313.04

preferences:
44.05 ms | 401 KiB | 5 Q