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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 => $cell) { echo "(3 * ($columnIndex / 3)) + ($rowIndex / 3) = ". (3 * ($columnIndex / 3)) ." + ". ($rowIndex / 3) ."\n"; $fields[(3 * ($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)
8.3.40.0090.00618.97
8.3.30.0120.00419.17
8.3.20.0080.00020.32
8.3.10.0040.00423.65
8.3.00.0090.00019.38
8.2.170.0160.00022.96
8.2.160.0120.00320.53
8.2.150.0090.00024.18
8.2.140.0090.00024.66
8.2.130.0110.00726.16
8.2.120.0120.00322.26
8.2.110.0060.00322.13
8.2.100.0060.00617.84
8.2.90.0060.00319.14
8.2.80.0060.00318.04
8.2.70.0030.00617.61
8.2.60.0040.00418.05
8.2.50.0030.00518.07
8.2.40.0090.00018.28
8.2.30.0050.00318.07
8.2.20.0040.00417.69
8.2.10.0060.00318.21
8.2.00.0000.01017.77
8.1.270.0000.00922.20
8.1.260.0040.00426.35
8.1.250.0030.00528.09
8.1.240.0030.00723.84
8.1.230.0060.00619.22
8.1.220.0040.00417.74
8.1.210.0000.00818.77
8.1.200.0000.00917.35
8.1.190.0030.00617.53
8.1.180.0030.00618.10
8.1.170.0030.00618.59
8.1.160.0050.00322.05
8.1.150.0080.00018.66
8.1.140.0040.00417.55
8.1.130.0000.00717.90
8.1.120.0000.00817.46
8.1.110.0040.00417.52
8.1.100.0000.00817.40
8.1.90.0070.00017.46
8.1.80.0060.00317.53
8.1.70.0040.00417.46
8.1.60.0090.00017.67
8.1.50.0040.00417.45
8.1.40.0000.00817.46
8.1.30.0040.00417.64
8.1.20.0030.00617.65
8.1.10.0060.00317.56
8.1.00.0000.00817.55
8.0.300.0030.00518.77
8.0.290.0040.00417.18
8.0.280.0000.00718.39
8.0.270.0050.00317.28
8.0.260.0030.00316.89
8.0.250.0020.00516.98
8.0.240.0000.00917.05
8.0.230.0000.00717.01
8.0.220.0030.00316.95
8.0.210.0030.00316.88
8.0.200.0000.00716.88
8.0.190.0040.00416.86
8.0.180.0070.00016.84
8.0.170.0000.00816.98
8.0.160.0050.00316.81
8.0.150.0000.00816.92
8.0.140.0070.00016.95
8.0.130.0000.00713.35
8.0.120.0040.00416.82
8.0.110.0000.00816.92
8.0.100.0000.00816.96
8.0.90.0080.00016.84
8.0.80.0040.01116.94
8.0.70.0090.00016.83
8.0.60.0040.00416.88
8.0.50.0050.00316.76
8.0.30.0150.00617.05
8.0.20.0140.00517.40
8.0.10.0040.00416.94
8.0.00.0100.01316.86
7.4.330.0050.00015.15
7.4.320.0060.00016.66
7.4.300.0070.00016.63
7.4.290.0000.00716.56
7.4.280.0000.00716.45
7.4.270.0000.00816.65
7.4.260.0040.00416.51
7.4.250.0030.00616.55
7.4.240.0060.00216.50
7.4.230.0000.00716.38
7.4.220.0060.01816.43
7.4.210.0130.00616.53
7.4.200.0040.00416.53
7.4.190.0070.00016.73
7.4.160.0110.00516.31
7.4.150.0040.01817.40
7.4.140.0090.01217.86
7.4.130.0080.01216.51
7.4.120.0100.01016.51
7.4.110.0140.00716.45
7.4.100.0110.00916.57
7.4.90.0110.00816.61
7.4.80.0130.00719.39
7.4.70.0140.01116.47
7.4.60.0130.00416.56
7.4.50.0060.00016.57
7.4.40.0110.00422.77
7.4.30.0100.00716.70
7.4.00.0100.00315.18
7.3.330.0030.00313.43
7.3.320.0000.00513.29
7.3.310.0040.00416.39
7.3.300.0030.00316.41
7.3.290.0100.00716.42
7.3.280.0090.00716.37
7.3.270.0110.00717.40
7.3.260.0090.00916.66
7.3.250.0140.00816.50
7.3.240.0120.00916.41
7.3.230.0160.00316.65
7.3.210.0100.01016.70
7.3.200.0040.01719.39
7.3.190.0130.00716.48
7.3.180.0070.01716.27
7.3.170.0030.01516.45
7.3.160.0100.00716.34
7.3.120.0120.00314.89
7.2.330.0120.00616.84
7.2.320.0090.00916.83
7.2.310.0110.01116.79
7.2.300.0060.01016.83
7.2.290.0110.00616.83
7.2.60.0150.00316.93
7.1.200.0030.01315.91
7.1.70.0040.01117.25
7.1.60.0070.01719.33
7.1.50.0090.00617.05
7.1.00.0070.07322.30
7.0.200.0000.01016.79
7.0.140.0000.07322.23
7.0.60.0100.03320.00
7.0.50.0170.07718.02
7.0.40.0030.05320.09
7.0.30.0400.04720.12
7.0.20.0270.08320.08
7.0.10.0100.03720.10
7.0.00.0070.07020.22
5.6.280.0000.08021.19
5.6.210.0070.04020.80
5.6.200.0030.05718.29
5.6.190.0030.05020.47
5.6.180.0330.04720.50
5.6.170.0200.05020.52
5.6.160.0100.06720.49
5.6.150.0030.04718.18
5.6.140.0070.06018.24
5.6.130.0070.04318.15
5.6.120.0100.07321.02
5.6.110.0130.06320.93
5.6.100.0100.08721.13
5.6.90.0030.08021.07
5.6.80.0030.05020.32
5.6.70.4700.04020.32
5.5.350.0070.08320.48
5.5.340.0100.03717.99
5.5.330.0070.08720.47
5.5.320.0170.04020.27
5.5.310.0270.08320.23
5.5.300.0070.04718.00
5.5.290.0130.07317.98
5.5.280.0030.08720.81
5.5.270.0070.09020.98
5.5.260.0100.07020.68
5.5.250.0030.09020.81
5.5.240.0100.04320.32
5.4.450.1570.03319.17
5.4.440.1000.04719.57
5.4.430.1000.08019.48
5.4.420.0270.05719.63
5.4.410.0270.05019.36
5.4.400.0200.05019.25
5.4.390.0100.06718.86
5.4.380.0130.06718.75
5.4.370.0200.05718.63
5.4.360.0200.06018.83
5.4.350.0430.06018.80
5.4.340.0170.06018.60
5.4.320.0080.04412.56
5.4.310.0090.03912.56
5.4.300.0080.04312.56
5.4.290.0090.04212.57
5.4.280.0070.03612.46
5.4.270.0100.03912.46
5.4.260.0100.04412.46
5.4.250.0050.04112.46
5.4.240.0060.04412.46
5.4.230.0070.03912.45
5.4.220.0120.03712.46
5.4.210.0080.03612.45
5.4.200.0110.03812.45
5.4.190.0100.03612.45
5.4.180.0140.03512.45
5.4.170.0210.04312.45
5.4.160.0160.04812.45
5.4.150.0170.05512.44
5.4.140.0240.04212.12
5.4.130.0420.08712.11
5.4.120.0230.04112.07
5.4.110.0180.04712.06
5.4.100.0200.04512.06
5.4.90.0190.04812.06
5.4.80.0210.04812.07
5.4.70.0150.04912.06
5.4.60.0220.04312.06
5.4.50.0200.04212.06
5.4.40.0230.06912.05
5.4.30.0220.04112.04
5.4.20.0190.04412.04
5.4.10.0360.06412.04
5.4.00.0210.04411.54
5.3.290.0120.04012.82
5.3.280.0080.03912.75
5.3.270.0240.04612.77
5.3.260.0370.09012.77
5.3.250.0230.04312.76
5.3.240.0200.04612.76
5.3.230.0160.05112.76
5.3.220.0280.06612.73
5.3.210.0160.05212.73
5.3.200.0200.04612.73
5.3.190.0240.04812.72
5.3.180.0360.04112.72
5.3.170.0470.08712.72
5.3.160.0380.08912.72
5.3.150.0390.09012.72
5.3.140.0220.04712.71
5.3.130.0210.04812.71
5.3.120.0400.06212.71
5.3.110.0190.04912.70
5.3.100.0170.04912.20
5.3.90.0210.04812.17
5.3.80.0200.04812.16
5.3.70.0270.07412.16
5.3.60.0210.04412.15
5.3.50.0240.04012.09
5.3.40.0200.04412.09
5.3.30.0210.04112.06
5.3.20.0230.04111.84
5.3.10.0210.04011.80
5.3.00.0370.09411.79
5.2.170.0180.0359.30
5.2.160.0160.0369.29
5.2.150.0200.0349.30
5.2.140.0130.0399.30
5.2.130.0120.0419.25
5.2.120.0390.0809.25
5.2.110.0230.0339.26
5.2.100.0150.0369.26
5.2.90.0140.0389.25
5.2.80.0220.0349.25
5.2.70.0200.0339.25
5.2.60.0310.0829.20
5.2.50.0130.0399.17
5.2.40.0190.0359.15
5.2.30.0140.0369.12
5.2.20.0200.0369.12
5.2.10.0250.0569.04
5.2.00.0190.0318.89
5.1.60.0140.0328.19
5.1.50.0180.0308.19
5.1.40.0170.0308.16
5.1.30.0200.0298.51
5.1.20.0210.0578.55
5.1.10.0240.0548.28
5.1.00.0140.0318.28
5.0.50.0140.0256.77
5.0.40.0120.0246.63
5.0.30.0100.0396.44
5.0.20.0100.0286.41
5.0.10.0120.0256.39
5.0.00.0150.0396.38
4.4.90.0080.0214.78
4.4.80.0080.0194.75
4.4.70.0070.0194.75
4.4.60.0140.0444.76
4.4.50.0110.0194.77
4.4.40.0070.0294.71
4.4.30.0070.0204.76
4.4.20.0080.0184.85
4.4.10.0100.0164.85
4.4.00.0090.0284.76
4.3.110.0080.0174.67
4.3.100.0060.0194.66
4.3.90.0080.0174.63
4.3.80.0100.0274.58
4.3.70.0050.0224.63
4.3.60.0070.0184.63
4.3.50.0050.0214.62
4.3.40.0080.0264.54
4.3.30.0070.0183.31
4.3.20.0060.0203.30
4.3.10.0050.0203.25
4.3.00.0070.02315.59

preferences:
43.89 ms | 400 KiB | 5 Q