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 = '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)
8.3.60.0070.00718.68
8.3.50.0090.00621.15
8.3.40.0090.00618.75
8.3.30.0100.00320.17
8.3.20.0040.00418.73
8.3.10.0040.00421.02
8.3.00.0040.00423.66
8.2.180.0180.00316.50
8.2.170.0090.01222.96
8.2.160.0100.00320.43
8.2.150.0060.00324.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0000.00819.95
8.2.110.0000.00920.56
8.2.100.0060.00617.91
8.2.90.0090.00019.21
8.2.80.0070.00019.28
8.2.70.0100.00017.63
8.2.60.0040.00417.93
8.2.50.0000.00818.07
8.2.40.0040.00420.01
8.2.30.0030.00719.47
8.2.20.0040.00417.74
8.2.10.0040.00417.62
8.2.00.0040.00417.64
8.1.280.0120.00625.92
8.1.270.0040.00423.99
8.1.260.0040.00426.35
8.1.250.0060.00328.09
8.1.240.0060.00321.99
8.1.230.0090.00620.71
8.1.220.0040.00417.88
8.1.210.0040.00418.77
8.1.200.0000.00817.35
8.1.190.0040.00417.53
8.1.180.0030.00718.10
8.1.170.0030.00618.54
8.1.160.0070.00018.92
8.1.150.0000.00818.61
8.1.140.0000.00817.41
8.1.130.0000.00717.84
8.1.120.0070.00017.48
8.1.110.0080.00017.38
8.1.100.0030.00317.49
8.1.90.0000.00717.36
8.1.80.0050.00217.54
8.1.70.0070.00017.45
8.1.60.0080.00017.62
8.1.50.0050.00317.40
8.1.40.0000.00917.37
8.1.30.0000.00817.56
8.1.20.0060.00317.57
8.1.10.0020.00517.55
8.1.00.0060.00317.57
8.0.300.0040.00418.77
8.0.290.0050.00217.18
8.0.280.0040.00418.52
8.0.270.0000.00817.33
8.0.260.0000.00616.84
8.0.250.0080.00016.96
8.0.240.0000.00716.86
8.0.230.0000.00716.84
8.0.220.0030.00316.98
8.0.210.0070.00016.80
8.0.200.0030.00316.86
8.0.190.0070.00016.86
8.0.180.0030.00616.84
8.0.170.0000.00716.76
8.0.160.0040.00416.91
8.0.150.0040.00416.97
8.0.140.0030.00316.80
8.0.130.0030.00313.33
8.0.120.0040.00416.97
8.0.110.0070.00016.86
8.0.100.0070.00316.78
8.0.90.0030.00416.92
8.0.80.0130.00316.95
8.0.70.0040.00416.77
8.0.60.0040.00416.92
8.0.50.0000.00816.95
8.0.30.0070.01117.22
8.0.20.0090.01217.40
8.0.10.0040.00417.00
8.0.00.0130.00516.86
7.4.330.0000.00714.89
7.4.320.0050.00216.55
7.4.300.0060.00316.43
7.4.290.0000.00716.54
7.4.280.0070.00016.45
7.4.270.0030.00316.59
7.4.260.0030.00313.22
7.4.250.0090.00016.59
7.4.240.0030.00316.39
7.4.230.0040.00416.60
7.4.220.0200.00316.43
7.4.210.0110.00816.60
7.4.200.0030.00316.70
7.4.190.0000.00716.77
7.4.160.0140.00316.39
7.4.150.0090.00917.40
7.4.140.0100.00717.86
7.4.130.0080.01016.63
7.4.120.0130.00616.48
7.4.110.0130.00916.39
7.4.100.0110.00716.62
7.4.90.0130.00316.51
7.4.80.0160.00319.39
7.4.70.0090.00916.39
7.4.60.0100.01016.50
7.4.50.0060.00316.54
7.4.40.0110.00622.77
7.4.30.0030.01316.67
7.4.00.0110.00414.89
7.3.330.0000.00613.34
7.3.320.0030.00313.37
7.3.310.0000.00716.49
7.3.300.0000.00716.26
7.3.290.0080.00616.37
7.3.280.0090.00916.41
7.3.270.0140.00717.40
7.3.260.0120.01018.24
7.3.250.0130.00716.50
7.3.240.0070.01016.46
7.3.230.0150.00316.56
7.3.210.0060.01216.65
7.3.200.0120.01119.39
7.3.190.0150.00416.37
7.3.180.0060.00916.56
7.3.170.0040.01816.69
7.3.160.0060.01016.65
7.3.120.0030.01214.85
7.2.330.0110.00816.81
7.2.320.0100.01316.85
7.2.310.0100.01416.75
7.2.300.0040.01216.76
7.2.290.0040.01216.48
7.2.00.0060.00619.29
7.1.100.0060.01018.23
7.1.70.0140.00717.06
7.1.60.0030.01619.17
7.1.50.0030.01016.95
7.1.00.0030.03322.57
7.0.200.0000.00916.52
7.0.140.0100.06322.12
7.0.60.0070.04319.84
7.0.50.0100.07017.88
7.0.40.0030.04320.11
7.0.30.0230.06720.30
7.0.20.0500.06020.07
7.0.10.0130.08020.10
7.0.00.0170.08020.29
5.6.280.0000.09020.99
5.6.210.0100.06320.72
5.6.200.0130.07718.19
5.6.190.0130.08320.41
5.6.180.0270.03320.64
5.6.170.0300.08320.51
5.6.160.0130.08020.39
5.6.150.0100.08718.14
5.6.140.0170.06718.28
5.6.130.0100.07018.15
5.6.120.0100.05020.91
5.6.110.0130.08321.02
5.6.100.0030.08721.05
5.6.90.0030.04320.99
5.6.80.0030.05320.48
5.5.350.0070.08020.31
5.5.340.0130.07017.96
5.5.330.0030.08720.37
5.5.320.0030.07320.35
5.5.310.0300.05720.41
5.5.300.0030.04017.98
5.5.290.0000.04318.02
5.5.280.0170.04320.80
5.5.270.0100.08320.77
5.5.260.0030.09020.88
5.5.250.0070.06020.62
5.5.240.0330.06720.29
5.4.450.0300.05719.49
5.4.440.0230.05719.55
5.4.430.0230.05719.54
5.4.420.0200.04019.45
5.4.410.0200.05319.33
5.4.400.0400.06319.09
5.4.390.0230.04019.20
5.4.380.0270.03719.25
5.4.370.0300.07319.16
5.4.360.0230.05719.20
5.4.350.0230.04719.06
5.4.340.0330.06019.13
5.4.320.0200.06019.09
5.4.310.0300.03718.87
5.4.300.0270.03319.14
5.4.290.0230.05018.87
5.4.280.0300.05319.01
5.4.270.0300.05019.22
5.4.260.0230.03719.09
5.4.250.0330.06019.12
5.4.240.0270.06018.83
5.4.230.0270.06319.23
5.4.220.0270.04319.06
5.4.210.0300.07019.05
5.4.200.0270.06019.05
5.4.190.0370.05319.05
5.4.180.0200.05019.15
5.4.170.0230.04019.07
5.4.160.0400.03019.07
5.4.150.0170.04019.07
5.4.140.0230.04316.51
5.4.130.0200.03316.40
5.4.120.0130.06016.55
5.4.110.0200.03716.40
5.4.100.0270.05316.33
5.4.90.0200.04716.31
5.4.80.0230.04316.57
5.4.70.0200.06016.59
5.4.60.0200.03316.49
5.4.50.0230.05716.27
5.4.40.0270.04016.57
5.4.30.0230.03316.51
5.4.20.0170.05016.25
5.4.10.0270.02716.51
5.4.00.0200.06715.96
5.3.290.0200.04314.83
5.3.280.0270.04714.58
5.3.270.0300.03014.59
5.3.260.0170.04014.66
5.3.250.0200.03314.52
5.3.240.0270.03014.52
5.3.230.0230.05714.69
5.3.220.0200.04014.66
5.3.210.0230.03314.66
5.3.200.0270.04314.57
5.3.190.0270.04014.58
5.3.180.0230.03314.55
5.3.170.0200.05314.65
5.3.160.0230.04014.47
5.3.150.0200.04014.56
5.3.140.0200.03714.54
5.3.130.0230.06014.56
5.3.120.0270.05014.48
5.3.110.0230.03314.46
5.3.100.0100.06314.29
5.3.90.0200.06714.11
5.3.80.0230.06714.18
5.3.70.0170.05014.25
5.3.60.0270.06713.98
5.3.50.0300.06313.87
5.3.40.0230.06713.84
5.3.30.0300.04013.82
5.3.20.0070.05713.72
5.3.10.0200.04013.59
5.3.00.0100.04713.77
5.2.170.0200.05011.31
5.2.160.0130.04011.06
5.2.150.0230.04711.24
5.2.140.0170.03011.38
5.2.130.0130.06311.03
5.2.120.0000.05011.09
5.2.110.0130.02311.27
5.2.100.0000.04011.12
5.2.90.0100.04311.02
5.2.80.0200.05711.10
5.2.70.0170.03011.16
5.2.60.0100.06310.96
5.2.50.0170.03711.00
5.2.40.0100.03010.93
5.2.30.0170.03011.10
5.2.20.0100.03010.89
5.2.10.0100.03710.88
5.2.00.0030.03310.84
5.1.60.0170.04710.84
5.1.50.0170.02710.84
5.1.40.0030.03010.84
5.1.30.0100.03010.84
5.1.20.0130.02310.84
5.1.10.0100.02310.84
5.1.00.0030.03010.84
5.0.50.0100.01710.84
5.0.40.0070.02310.84
5.0.30.0000.06710.84
5.0.20.0030.02710.84
5.0.10.0070.03010.84
5.0.00.0430.03010.84
4.4.90.0000.01710.84
4.4.80.0100.02310.84
4.4.70.0030.02310.84
4.4.60.0070.02010.84
4.4.50.0070.02010.84
4.4.40.0000.03310.84
4.4.30.0070.02710.84
4.4.20.0030.01710.84
4.4.10.0030.01710.84
4.4.00.0030.03710.84
4.3.110.0070.03710.84
4.3.100.0030.01710.84
4.3.90.0000.03310.84
4.3.80.1170.03310.84
4.3.70.0030.01710.84
4.3.60.0000.01710.84
4.3.50.0000.02010.84
4.3.40.0000.03010.84
4.3.30.0030.01310.84
4.3.20.0230.02010.84
4.3.10.0530.02710.84
4.3.00.0570.01710.84

preferences:
52.29 ms | 401 KiB | 5 Q