3v4l.org

run code in 300+ PHP versions simultaneously
<?php // Returns the total number of $count-length strings generatable from $letters. function getPermCount($letters, $count) { $result = 1; // k characters from a set of n has n!/(n-k)! possible combinations for($i = strlen($letters) - $count + 1; $i <= strlen($letters); $i++) { $result *= $i; } return $result; } // Decodes $index to a $count-length string from $letters, no repeat chars. function getPerm($letters, $count, $index) { $result = array(); for($i = 0; $i < $count; $i++) { $pos = $index % strlen($letters); $result[] = $letters[$pos]; $index = ($index-$pos)/strlen($letters); $letters = substr($letters, 0, $pos) . substr($letters, $pos+1); } sort($result); $result = array_unique($result, SORT_REGULAR); return implode("", $result); } $r = array(); //$letters = 'abcdefghijklm'; $letters = 'abcdefghi'; $len = strlen($letters); for ($c = 1; $c <= $len; $c++) { for($i = 0; $i < getPermCount($letters, $c); $i++) $r[] = getPerm($letters, $c, $i); } //print_r(array_unique($r, SORT_REGULAR)); $r = array_unique($r, SORT_REGULAR); print_r(count($r));

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)
8.3.60.0201.98360.08
8.3.50.0701.93554.96
8.3.40.0371.17745.13
8.3.30.0401.25346.37
8.3.20.0370.62645.02
8.3.10.0070.64645.87
8.3.00.0100.68548.14
8.2.180.0671.94157.70
8.2.170.0201.18844.89
8.2.160.0301.15946.46
8.2.150.0200.61444.88
8.2.140.0200.62146.50
8.2.130.0200.63946.89
8.2.120.0070.66045.77
8.2.110.0201.01045.38
8.2.100.0230.91843.99
8.2.90.0170.91145.20
8.2.80.0070.87945.28
8.2.70.0130.95643.79
8.2.60.0170.94544.08
8.2.50.0130.91744.23
8.2.40.0200.85446.65
8.2.30.0331.06245.37
8.2.20.0170.92843.80
8.2.10.0200.93043.85
8.2.00.0130.90743.66
8.1.280.0601.13051.85
8.1.270.0370.25138.12
8.1.260.0300.25636.25
8.1.250.0070.27838.66
8.1.240.0200.40838.18
8.1.230.0300.38733.87
8.1.220.0030.42733.86
8.1.210.0030.40733.25
8.1.200.0100.41233.35
8.1.190.0170.40733.32
8.1.180.0100.40833.48
8.1.170.0070.39834.75
8.1.160.0200.39734.91
8.1.150.0170.36336.34
8.1.140.0100.40933.45
8.1.130.0100.39533.96
8.1.120.0130.41533.44
8.1.110.0030.41133.41
8.1.100.0170.41333.57
8.1.90.0070.42933.55
8.1.80.0100.39633.43
8.1.70.0100.40633.54
8.1.60.0070.43933.65
8.1.50.0070.43633.47
8.1.40.0100.43733.59
8.1.30.0130.43033.72
8.1.20.0070.44133.66
8.1.10.0230.93251.73
8.1.00.0270.98051.66
8.0.300.0500.95752.06
8.0.290.0200.88450.77
8.0.280.0270.86252.49
8.0.270.0370.85851.21
8.0.260.0170.90450.80
8.0.250.0200.90050.82
8.0.240.0761.14550.90
8.0.230.0100.91050.89
8.0.220.0200.91950.90
8.0.210.0100.95651.00
8.0.200.0270.89050.91
8.0.190.0230.94451.01
8.0.180.0401.03350.91
8.0.170.0430.92850.81
8.0.160.0270.94850.83
8.0.150.0100.95950.77
8.0.140.0170.94250.89
8.0.130.0531.948109.32
8.0.120.0270.95650.82
8.0.110.0130.95050.89
8.0.100.0200.93850.89
8.0.90.0230.93350.94
8.0.80.0461.60750.79
8.0.70.0130.94650.96
8.0.60.0330.94250.91
8.0.50.0370.92550.93
8.0.30.0611.63251.10
8.0.20.0801.65251.40
8.0.10.0200.96050.89
8.0.00.0671.71848.17
7.4.330.0371.00248.82
7.4.320.0100.95050.57
7.4.300.0130.95550.59
7.4.290.0171.01950.52
7.4.280.0101.02850.40
7.4.270.0231.02650.58
7.4.260.0671.94176.74
7.4.250.0401.04350.58
7.4.240.0231.01750.51
7.4.230.0201.00850.24
7.4.220.0821.91949.59
7.4.210.0631.66350.62
7.4.200.0270.99050.62
7.4.190.0171.00750.66
7.4.160.0731.58150.66
7.4.150.0631.61950.55
7.4.140.0611.60150.47
7.4.130.0731.71050.49
7.4.120.0661.57150.63
7.4.110.0721.70450.40
7.4.100.1021.58150.48
7.4.90.0792.34747.43
7.4.80.0901.71150.46
7.4.70.0791.86950.67
7.4.60.0761.63350.56
7.4.50.0270.79250.50
7.4.40.0131.79650.48
7.4.30.0732.06450.52
7.3.330.0331.97373.98
7.3.320.0601.93970.03
7.3.310.0171.07950.28
7.3.300.0131.06150.24
7.3.290.0801.88050.37
7.3.280.0611.89349.96
7.3.270.0851.63750.50
7.3.260.1411.81547.58
7.3.250.0731.71850.52
7.3.240.0591.71950.43
7.3.230.0761.83350.27
7.3.210.0962.11950.45
7.3.200.0752.38844.94
7.3.190.0731.83750.58
7.3.180.0461.58750.27
7.3.170.0561.72350.52
7.3.160.0561.57950.40
7.2.330.0431.62550.43
7.2.320.0852.38350.23
7.2.310.0982.18450.47
7.2.300.0731.61450.82
7.2.290.0461.72850.80
7.2.91.0800.80728.73
7.2.81.3060.89334.49
7.1.210.7450.62125.77
7.1.201.1941.13829.76
7.0.311.1560.97929.48

preferences:
53.52 ms | 401 KiB | 5 Q