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); //array_unique($r, SORT_REGULAR); return implode("", $result); } $r = array(); //$letters = 'abcdefghijklm'; $letters = 'abc'; $len = strlen($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)
8.3.60.0170.00318.56
8.3.50.0130.00821.20
8.3.40.0170.00318.84
8.3.30.0140.00020.09
8.3.20.0080.00018.90
8.3.10.0070.00021.14
8.3.00.0030.00523.59
8.2.180.0090.01216.88
8.2.170.0070.00722.96
8.2.160.0080.00620.39
8.2.150.0030.00624.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0040.00419.83
8.2.110.0070.00320.58
8.2.100.0080.00418.03
8.2.90.0000.00719.17
8.2.80.0000.00919.23
8.2.70.0040.00417.63
8.2.60.0050.00318.02
8.2.50.0030.00818.07
8.2.40.0040.00418.16
8.2.30.0070.00019.46
8.2.20.0040.00417.63
8.2.10.0080.00017.83
8.2.00.0070.00017.65
8.1.280.0100.01025.92
8.1.270.0040.00423.99
8.1.260.0030.00626.35
8.1.250.0040.00428.09
8.1.240.0000.00920.73
8.1.230.0040.00720.86
8.1.220.0060.00318.77
8.1.210.0050.00318.88
8.1.200.0040.00417.23
8.1.190.0070.00017.41
8.1.180.0040.00418.10
8.1.170.0050.00318.53
8.1.160.0040.00418.82
8.1.150.0000.00818.61
8.1.140.0050.00217.48
8.1.130.0000.00817.77
8.1.120.0060.00317.52
8.1.110.0000.00717.39
8.1.100.0000.00717.37
8.1.90.0070.00017.48
8.1.80.0000.00717.49
8.1.70.0080.00017.51
8.1.60.0030.00617.50
8.1.50.0040.00417.46
8.1.40.0040.00417.38
8.1.30.0000.00817.67
8.1.20.0040.00417.66
8.1.10.0040.00417.61
8.1.00.0000.00717.58
8.0.300.0070.00019.84
8.0.290.0040.00417.28
8.0.280.0000.00818.40
8.0.270.0000.00717.31
8.0.260.0000.00716.85
8.0.250.0040.00416.90
8.0.240.0030.00517.02
8.0.230.0000.00716.83
8.0.220.0030.00316.94
8.0.210.0030.00316.83
8.0.200.0000.00817.00
8.0.190.0040.00416.86
8.0.180.0030.00416.85
8.0.170.0040.00416.82
8.0.160.0000.00816.92
8.0.150.0000.00816.85
8.0.140.0070.00016.84
8.0.130.0000.00613.36
8.0.120.0040.00416.92
8.0.110.0040.00416.93
8.0.100.0000.00716.91
8.0.90.0040.00416.82
8.0.80.0040.01116.89
8.0.70.0000.00716.97
8.0.60.0040.00416.95
8.0.50.0040.00416.80
8.0.30.0050.01317.23
8.0.20.0070.01517.40
8.0.10.0000.00716.91
8.0.00.0130.00516.82
7.4.330.0030.00316.85
7.4.320.0040.00416.59
7.4.300.0030.00316.54
7.4.290.0070.00016.64
7.4.280.0030.00316.53
7.4.270.0040.00416.62
7.4.260.0030.00313.30
7.4.250.0050.00316.61
7.4.240.0000.00716.55
7.4.230.0030.00316.72
7.4.220.0120.01216.68
7.4.210.0100.00616.62
7.4.200.0040.00416.61
7.4.190.0070.00016.63
7.4.160.0120.00416.63
7.4.150.0110.00617.40
7.4.140.0120.00817.86
7.4.130.0110.00716.57
7.4.120.0080.01016.51
7.4.110.0160.00316.58
7.4.100.0090.01116.57
7.4.90.0110.00716.71
7.4.80.0160.00619.39
7.4.70.0080.01116.53
7.4.60.0040.01416.45
7.4.50.0080.00016.71
7.4.40.0090.00622.77
7.4.30.0120.00816.48
7.4.00.0070.01115.07
7.3.330.0030.00313.21
7.3.320.0050.00013.40
7.3.310.0030.00316.46
7.3.300.0030.00516.27
7.3.290.0070.00716.43
7.3.280.0090.00616.39
7.3.270.0140.01117.40
7.3.260.0120.00618.24
7.3.250.0080.00816.68
7.3.240.0040.01216.70
7.3.230.0060.01216.57
7.3.210.0120.00916.49
7.3.200.0060.01219.39
7.3.190.0060.00916.59
7.3.180.0030.01316.49
7.3.170.0060.01216.63
7.3.160.0080.00816.62
7.3.120.0090.00914.93
7.3.110.0040.01114.34
7.3.100.0040.01114.86
7.3.90.0060.01015.00
7.3.80.0000.01514.66
7.3.70.0070.00714.87
7.3.60.0090.00614.94
7.3.50.0090.00314.81
7.3.40.0030.01014.84
7.3.30.0100.00314.82
7.3.20.0070.00716.77
7.3.10.0100.00716.69
7.3.00.0120.00616.64
7.2.330.0120.00816.79
7.2.320.0070.01516.75
7.2.310.0060.01216.52
7.2.300.0120.00416.79
7.2.290.0100.00616.57
7.2.250.0070.01015.09
7.2.240.0060.01314.95
7.2.230.0100.01015.07
7.2.220.0060.00914.99
7.2.210.0130.00315.00
7.2.200.0070.00715.03
7.2.190.0050.00514.99
7.2.180.0060.00615.04
7.2.170.0000.01115.04
7.2.00.0060.00619.40
7.1.330.0040.00715.83
7.1.320.0060.01015.98
7.1.310.0040.00815.75
7.1.300.0070.00715.71
7.1.290.0110.00315.95
7.1.280.0070.00715.59
7.1.270.0030.01015.59
7.1.260.0060.00615.82
7.1.100.0050.00518.21
7.1.70.0000.00817.22
7.1.60.0100.00719.17
7.1.50.0000.01916.96
7.1.00.0070.03022.45
7.0.200.0030.00716.87
7.0.140.0070.07322.01
7.0.60.0230.07321.77
7.0.50.0200.06717.92
7.0.40.0030.08020.24
7.0.30.0270.08020.23
7.0.20.0300.03720.26
7.0.10.0030.07320.21
7.0.00.0070.07720.23
5.6.280.0030.07321.10
5.6.210.0100.04720.71
5.6.200.0030.04018.20
5.6.190.0100.08320.61
5.6.180.0330.05720.65
5.6.170.0130.04020.54
5.6.160.0030.04020.50
5.6.150.0170.03718.16
5.6.140.0170.03718.17
5.6.130.0030.07318.15
5.6.120.0070.08321.03
5.6.110.0070.04021.01
5.6.100.0000.07021.05
5.6.90.0030.04321.02
5.6.80.0100.07720.52
5.5.350.0130.09020.38
5.5.340.0100.07317.95
5.5.330.0000.05320.40
5.5.320.0300.04720.32
5.5.310.0330.06720.31
5.5.300.0000.04718.00
5.5.290.0070.05717.92
5.5.280.0070.08020.86
5.5.270.0100.04320.82
5.5.260.0030.08020.87
5.5.250.0030.07020.47
5.5.240.0100.06320.07
5.4.450.0030.04019.37
5.4.440.0030.05019.56
5.4.430.0030.04319.47
5.4.420.0100.03319.58
5.4.410.0070.04019.36
5.4.400.0000.04018.97
5.4.390.0100.07319.22
5.4.380.0170.04019.17
5.4.370.0230.04018.97
5.4.360.0270.04319.15
5.4.350.0300.03018.93
5.4.340.0300.03319.06
5.4.320.0270.03718.98
5.4.310.0230.04318.99
5.4.300.0300.03319.26
5.4.290.0130.04719.20
5.4.280.0230.03718.96
5.4.270.0230.03318.93
5.4.260.0200.04019.25
5.4.250.0200.04719.15
5.4.240.0230.03718.94
5.4.230.0130.04019.19
5.4.220.0170.04319.16
5.4.210.0200.03718.92
5.4.200.0200.04319.25
5.4.190.0430.07719.09
5.4.180.0270.03719.10
5.4.170.0330.07319.12
5.4.160.0230.06318.95
5.4.150.0130.08018.95
5.4.140.0070.08016.40
5.4.130.0130.05716.44
5.4.120.0170.04716.34
5.4.110.0200.07016.37
5.4.100.0070.05716.51
5.4.90.0100.06316.61
5.4.80.0070.04716.48
5.4.70.0230.03716.56
5.4.60.0170.04016.52
5.4.50.0170.05716.35
5.4.40.0130.06316.48
5.4.30.0170.03716.41
5.4.20.0230.04016.34
5.4.10.0200.03316.43
5.4.00.0170.05715.91
5.3.290.0230.04714.72
5.3.280.0200.04714.61
5.3.270.0230.04014.64
5.3.260.0230.04014.67
5.3.250.0170.04314.64
5.3.240.0200.06014.61
5.3.230.0030.05714.75
5.3.220.0130.05014.58
5.3.210.0200.05314.61
5.3.200.0230.07014.65
5.3.190.0170.06314.59
5.3.180.0200.03714.59
5.3.170.0070.06014.63
5.3.160.0130.05714.63
5.3.150.0170.03714.60
5.3.140.0200.04014.57
5.3.130.0230.06714.61
5.3.120.0200.05714.60
5.3.110.0230.03714.60
5.3.100.0230.04014.04
5.3.90.0330.05314.04
5.3.80.0330.03014.05
5.3.70.0330.05714.17
5.3.60.0470.05714.01
5.3.50.0400.06013.95
5.3.40.0230.06313.92
5.3.30.0270.04313.88
5.3.20.0430.06013.76
5.3.10.0430.07013.71
5.3.00.0270.05013.70
5.2.170.0330.05011.16
5.2.160.0300.05311.12
5.2.150.0170.04011.30
5.2.140.0370.05011.24
5.2.130.0330.05311.12
5.2.120.0370.05711.07
5.2.110.0300.05311.15
5.2.100.0200.05311.08
5.2.90.0170.03311.04
5.2.80.0270.03711.09
5.2.70.0300.04311.16
5.2.60.0400.04711.11
5.2.50.0300.04311.07
5.2.40.0200.04311.04
5.2.30.0270.03010.93
5.2.20.0230.03311.12
5.2.10.0170.03310.89
5.2.00.0130.06710.69
5.1.60.0270.04310.16
5.1.50.0130.04710.03
5.1.40.0200.0339.96
5.1.30.0200.03310.35
5.1.20.0200.05010.43
5.1.10.0200.04310.07
5.1.00.0170.02710.07
5.0.50.0030.0338.63
5.0.40.0030.0478.63
5.0.30.0070.0578.63
5.0.20.0130.0408.63
5.0.10.0130.0408.63
5.0.00.0230.0478.63
4.4.90.0130.0338.63
4.4.80.0130.0308.63
4.4.70.0170.0278.63
4.4.60.0100.0208.63
4.4.50.0170.0138.63
4.4.40.0070.0408.63
4.4.30.0030.0238.63
4.4.20.0030.0278.63
4.4.10.0070.0308.63
4.4.00.0070.0438.63
4.3.110.0070.0178.63
4.3.100.0130.0208.63
4.3.90.0170.0278.63
4.3.80.0100.0378.63
4.3.70.0130.0278.63
4.3.60.0130.0378.63
4.3.50.0170.0238.63
4.3.40.0100.0308.63
4.3.30.0030.0238.63
4.3.20.0100.0338.63
4.3.10.0130.0208.63
4.3.00.0070.0208.63

preferences:
39.44 ms | 401 KiB | 5 Q