Online PHP editor | perf for iSp7G

<?php class SudokuSolver { const NUMBERS = "123456789" protected $sudokuColumns; public function __construct ($sudoku) { $this->sudokuColumns = $sudoku; } // could be static as well public function printOut ($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; // 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) { $this->checkRow($rowIndex); } } protected function checkRow ($rowIndex, $row) { $numbers = self::NUMBERS; echo "checking $rowIndex..\n"; foreach ($row as $column) { if (false === strpos($column,$numbers)) { return false; } $numbers = str_replace($col,'',$numbers); } 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);

Version	System time (s)	User time (s)	Memory (MiB)
5.4.17	0.008	0.038	12.40
5.4.16	0.006	0.041	12.39
5.4.15	0.006	0.038	12.39
5.4.14	0.006	0.042	12.08
5.4.13	0.008	0.038	12.06
5.4.12	0.006	0.040	12.03
5.4.11	0.009	0.037	12.02
5.4.10	0.008	0.041	12.02
5.4.9	0.008	0.046	12.02
5.4.8	0.008	0.045	12.02
5.4.7	0.008	0.043	12.02
5.4.6	0.008	0.043	12.02
5.4.5	0.008	0.041	12.02
5.4.4	0.008	0.039	12.00
5.4.3	0.006	0.040	12.00
5.4.2	0.005	0.038	12.00
5.4.1	0.009	0.038	12.00
5.4.0	0.006	0.041	11.49
5.3.27	0.006	0.048	12.73
5.3.26	0.007	0.048	12.72
5.3.25	0.009	0.044	12.72
5.3.24	0.007	0.043	12.72
5.3.23	0.007	0.048	12.71
5.3.22	0.013	0.052	12.68
5.3.21	0.008	0.048	12.68
5.3.20	0.010	0.054	12.68
5.3.19	0.008	0.042	12.68
5.3.18	0.006	0.044	12.67
5.3.17	0.008	0.044	12.67
5.3.16	0.008	0.042	12.67
5.3.15	0.007	0.047	12.67
5.3.14	0.009	0.043	12.66
5.3.13	0.008	0.043	12.66
5.3.12	0.007	0.043	12.66
5.3.11	0.008	0.047	12.66
5.3.10	0.009	0.044	12.12
5.3.9	0.008	0.049	12.10
5.3.8	0.008	0.051	12.09
5.3.7	0.009	0.044	12.09
5.3.6	0.008	0.040	12.08
5.3.5	0.007	0.040	12.02
5.3.4	0.007	0.040	12.02
5.3.3	0.009	0.039	11.98
5.3.2	0.009	0.039	11.76
5.3.1	0.006	0.040	11.73
5.3.0	0.008	0.046	11.71