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); return implode("", $result); } $r = array(); //$letters = 'abcdefghijklm'; $letters = 'abcdef'; $len = strlen($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));

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)
8.3.60.0040.01318.43
8.3.50.0170.01018.07
8.3.40.0110.00718.88
8.3.30.0070.01119.20
8.3.20.0000.00920.46
8.3.10.0030.00623.65
8.3.00.0000.00920.77
8.2.180.0110.01118.22
8.2.170.0070.01122.96
8.2.160.0070.01120.60
8.2.150.0060.00324.18
8.2.140.0060.00324.66
8.2.130.0110.00726.16
8.2.120.0000.01020.91
8.2.110.0000.01121.18
8.2.100.0070.01018.03
8.2.90.0030.00719.16
8.2.80.0080.00317.97
8.2.70.0050.00517.88
8.2.60.0090.00318.13
8.2.50.0000.01018.10
8.2.40.0030.00718.16
8.2.30.0080.00318.57
8.2.20.0040.00717.99
8.2.10.0030.00718.24
8.2.00.0030.00718.00
8.1.280.0070.01025.92
8.1.270.0030.00723.92
8.1.260.0000.00926.35
8.1.250.0100.00328.09
8.1.240.0060.00622.39
8.1.230.0110.00418.14
8.1.220.0000.01118.01
8.1.210.0030.00718.77
8.1.200.0040.00817.47
8.1.190.0000.01017.48
8.1.180.0030.00718.10
8.1.170.0100.00018.91
8.1.160.0060.00322.18
8.1.150.0070.00318.88
8.1.140.0000.01017.61
8.1.130.0060.00318.09
8.1.120.0060.00317.79
8.1.110.0030.00717.55
8.1.100.0000.01017.61
8.1.90.0000.01017.64
8.1.80.0000.01017.78
8.1.70.0000.00917.73
8.1.60.0110.00017.86
8.1.50.0030.00717.80
8.1.40.0030.00717.73
8.1.30.0040.00817.84
8.1.20.0000.01017.78
8.1.10.0070.00317.70
8.1.00.0030.00717.84
8.0.300.0060.00318.77
8.0.290.0030.00616.75
8.0.280.0060.00318.82
8.0.270.0060.00317.52
8.0.260.0000.00917.39
8.0.250.0060.00317.13
8.0.240.0070.00317.23
8.0.230.0030.00617.07
8.0.220.0030.00717.02
8.0.210.0060.00317.16
8.0.200.0030.00917.23
8.0.190.0000.01017.11
8.0.180.0030.00717.03
8.0.170.0040.00717.05
8.0.160.0030.00717.11
8.0.150.0060.00317.13
8.0.140.0050.00517.13
8.0.130.0100.00313.52
8.0.120.0030.00717.07
8.0.110.0030.00717.04
8.0.100.0050.00516.97
8.0.90.0070.00317.04
8.0.80.0030.01617.13
8.0.70.0070.00316.98
8.0.60.0030.00617.10
8.0.50.0030.00717.14
8.0.30.0150.00817.47
8.0.20.0120.01117.45
8.0.10.0000.01017.07
8.0.00.0150.00717.10
7.4.330.0000.00815.14
7.4.320.0040.00416.79
7.4.300.0030.00516.77
7.4.290.0050.00516.87
7.4.280.0040.00816.71
7.4.270.0030.00616.67
7.4.260.0040.00816.86
7.4.250.0070.00416.73
7.4.240.0060.00516.73
7.4.230.0030.00616.77
7.4.220.0160.00916.80
7.4.210.0120.00616.82
7.4.200.0060.00316.93
7.4.160.0090.01217.04
7.4.150.0070.01717.40
7.4.140.0130.01017.86
7.4.130.0050.01616.81
7.4.120.0100.01116.71
7.4.110.0120.01016.65
7.4.100.0130.00716.77
7.4.90.0140.00716.82
7.4.80.0070.01719.39
7.4.70.0090.01216.82
7.4.60.0130.01316.93
7.4.50.0030.00916.67
7.4.40.0120.01716.71
7.4.30.0090.01216.77
7.4.00.0100.01015.52
7.3.330.0000.00813.64
7.3.320.0000.00913.49
7.3.310.0000.00916.67
7.3.300.0000.01016.50
7.3.290.0060.01616.60
7.3.280.0130.01016.63
7.3.270.0060.01617.40
7.3.260.0080.02316.85
7.3.250.0140.01316.77
7.3.240.0100.01916.87
7.3.230.0080.01316.92
7.3.210.0110.01116.74
7.3.200.0090.01219.39
7.3.190.0060.01516.74
7.3.180.0060.01316.83
7.3.170.0150.01516.94
7.3.160.0120.00916.80
7.3.120.0000.02114.98
7.2.330.0110.01216.66
7.2.320.0100.01316.84
7.2.310.0090.01217.08
7.2.300.0090.01217.05
7.2.290.0090.01216.86
7.2.60.0030.01317.01
7.2.00.0000.01519.65
7.1.200.0000.01415.57
7.1.100.0150.00417.72
7.1.70.0030.01917.02
7.1.60.0080.00816.86
7.1.50.0070.02116.98
7.1.00.0030.08322.33
7.0.200.0090.01216.78
7.0.140.0170.06722.15
7.0.100.0070.08720.16
7.0.90.0030.06020.13
7.0.80.0100.04020.24
7.0.70.0030.09320.21
7.0.60.0170.07020.33
7.0.50.0130.08020.55
7.0.40.0100.08020.11
7.0.30.0070.07320.09
7.0.20.0070.08320.10
7.0.10.0000.09019.95
7.0.00.0130.08320.14
5.6.250.0030.09321.17
5.6.240.0000.10321.27
5.6.230.0070.09321.23
5.6.220.0100.08021.16
5.6.210.0070.06321.20
5.6.200.0130.09321.61
5.6.190.0100.09021.54
5.6.180.0030.09021.68
5.6.170.0100.06021.50
5.6.160.0170.08321.58
5.6.150.0030.08721.65
5.6.140.0030.08321.56
5.6.130.0030.09721.56
5.6.120.0130.08721.65
5.6.110.0130.05721.55
5.6.100.0170.07721.56
5.6.90.0130.09321.55
5.6.80.0000.09720.98
5.6.70.0130.08320.89
5.6.60.0070.10021.09
5.6.50.0030.09721.01
5.6.40.0100.08720.91
5.6.30.0230.03720.83
5.6.20.0000.07720.94
5.6.10.0100.05020.93
5.6.00.0070.04720.97
5.5.380.0000.11020.93
5.5.370.0070.09720.99
5.5.360.0100.06720.89
5.5.350.0100.09021.00
5.5.340.0070.08721.34
5.5.330.0130.09721.18
5.5.320.0100.09721.46
5.5.310.0100.09021.43
5.5.300.0100.07021.36
5.5.290.0170.06021.41
5.5.280.0100.10021.38
5.5.270.0100.10021.30
5.5.260.0170.08721.45
5.5.250.0030.09721.29
5.5.240.0170.08020.85
5.5.230.0070.09720.78
5.5.220.0030.09720.65
5.5.210.0070.07020.81
5.5.200.0100.08320.81
5.5.190.0200.03720.75
5.5.180.0130.05320.62
5.5.160.0070.05320.68
5.5.150.0070.04720.66
5.5.140.0030.05020.52
5.5.130.0100.04320.81
5.5.120.0100.04020.63
5.5.110.0130.04320.77
5.5.100.0030.06320.70
5.5.90.0070.05320.52
5.5.80.0000.07320.59
5.5.70.0070.06020.45
5.5.60.0130.06320.55
5.5.50.0130.04020.63
5.5.40.0130.08720.55
5.5.30.0030.05020.64
5.5.20.0000.05720.60
5.5.10.0030.06020.54
5.5.00.0030.05020.59
5.4.450.0070.09019.91
5.4.440.0100.08020.11
5.4.430.0070.09319.83
5.4.420.0130.08019.82
5.4.410.0070.09319.68
5.4.400.0100.08319.60
5.4.390.0030.09019.52
5.4.380.0030.08719.33
5.4.370.0030.09319.70
5.4.360.0100.08719.53
5.4.350.0130.05719.66
5.4.340.0030.06719.52
5.4.320.0100.08019.38
5.4.310.0030.05019.36
5.4.300.0100.05019.57
5.4.290.0070.04719.71
5.4.280.0130.05019.50
5.4.270.0070.05019.42
5.4.260.0100.05319.41
5.4.250.0070.04319.59
5.4.240.0100.06719.54
5.4.230.0030.05019.36
5.4.220.0070.09719.42
5.4.210.0000.05019.36
5.4.200.0030.05019.50
5.4.190.0070.04319.57
5.4.180.0130.03319.65
5.4.170.0100.04319.68
5.4.160.0030.05019.45
5.4.150.0030.05019.40
5.4.140.0030.04716.85
5.4.130.0030.04316.96
5.4.120.0030.04716.86
5.4.110.0030.07316.95
5.4.100.0070.05317.00
5.4.90.0000.04716.77
5.4.80.0030.04317.10
5.4.70.0000.05716.79
5.4.60.0030.04716.90
5.4.50.0100.05016.89
5.4.40.0000.05316.78
5.4.30.0030.06016.99
5.4.20.0100.08016.84
5.4.10.0170.08016.79
5.4.00.0070.08016.34
5.3.290.0070.04715.37
5.3.280.0030.08315.37
5.3.270.0030.04715.21
5.3.260.0030.08315.29
5.3.250.0000.05315.38
5.3.240.0000.06015.27
5.3.230.0100.04315.30
5.3.220.0030.05015.23
5.3.210.0000.05315.27
5.3.200.0070.04015.30
5.3.190.0030.04715.36
5.3.180.0130.04015.19
5.3.170.0030.04315.18
5.3.160.0030.05715.29
5.3.150.0070.07715.29
5.3.140.0030.04715.28
5.3.130.0030.05315.30
5.3.120.0030.05015.21
5.3.110.0100.08015.23
5.3.100.0030.06714.80
5.3.90.0070.06314.80
5.3.80.0030.09314.73
5.3.70.0130.08714.77
5.3.60.0030.06314.78
5.3.50.0100.08714.68
5.3.40.0030.10014.71
5.3.30.0070.08014.47
5.3.20.0030.08714.27
5.3.10.0100.05314.32
5.3.00.0030.08714.23
5.2.170.0030.08311.55
5.2.160.0030.06711.48
5.2.150.0070.08011.49
5.2.140.0030.08711.27
5.2.130.0070.08311.23
5.2.120.0070.07711.30
5.2.110.0100.07711.30
5.2.100.0170.06311.30
5.2.90.0030.08311.36
5.2.80.0130.07011.50
5.2.70.0030.08311.41
5.2.60.0030.08311.34
5.2.50.0030.08011.36
5.2.40.0070.08311.31
5.2.30.0030.08011.15
5.2.20.0070.07711.37
5.2.10.0000.08311.16
5.2.00.0070.07310.86
5.1.60.0000.07310.63
5.1.50.0030.07710.63
5.1.40.0030.07310.54
5.1.30.0130.06710.76
5.1.20.0000.08311.01
5.1.10.0070.07310.70
5.1.00.0030.07010.69
5.0.50.0070.0509.17
5.0.40.0070.0839.07
5.0.30.0030.0938.66
5.0.20.0100.0708.84
5.0.10.0030.0778.82
5.0.00.0000.0878.79
4.4.90.0070.0737.95
4.4.80.0000.0737.95
4.4.70.0070.0707.95
4.4.60.0000.0937.95
4.4.50.0130.0637.95
4.4.40.0030.0877.95
4.4.30.0130.0377.95
4.4.20.0000.0777.95
4.4.10.0000.0707.95
4.4.00.0030.0837.95
4.3.110.0030.0677.95
4.3.100.0000.0777.95
4.3.90.0070.0707.95
4.3.80.0100.0437.95
4.3.70.0030.0737.95
4.3.60.0030.0537.95
4.3.50.0000.0807.95
4.3.40.0030.0837.95
4.3.30.0030.0737.95
4.3.20.0000.0637.95
4.3.10.0030.0707.95
4.3.00.0030.0477.95

preferences:
54.46 ms | 400 KiB | 5 Q