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 = '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));

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)
8.3.60.0090.01218.43
8.3.50.0200.00522.01
8.3.40.0070.00718.63
8.3.30.0090.01219.04
8.3.20.0040.00420.33
8.3.10.0040.00423.48
8.3.00.0040.00420.90
8.2.180.0100.01018.42
8.2.170.0100.01022.96
8.2.160.0070.00720.43
8.2.150.0040.00424.18
8.2.140.0050.00324.66
8.2.130.0050.00326.16
8.2.120.0000.00720.89
8.2.110.0100.00021.04
8.2.100.0090.00318.16
8.2.90.0040.00719.06
8.2.80.0030.00517.97
8.2.70.0030.00617.50
8.2.60.0040.00417.93
8.2.50.0030.00518.10
8.2.40.0050.00220.30
8.2.30.0050.00219.21
8.2.20.0000.00817.66
8.2.10.0000.00818.01
8.2.00.0090.00017.69
8.1.280.0130.00625.92
8.1.270.0040.00422.06
8.1.260.0080.00026.35
8.1.250.0070.00028.09
8.1.240.0120.00020.84
8.1.230.0070.00320.27
8.1.220.0040.00417.74
8.1.210.0030.00618.77
8.1.200.0030.00617.35
8.1.190.0000.00917.23
8.1.180.0000.00818.10
8.1.170.0080.00018.38
8.1.160.0030.00518.89
8.1.150.0040.00420.16
8.1.140.0050.00317.42
8.1.130.0000.00717.80
8.1.120.0000.00717.50
8.1.110.0080.00017.45
8.1.100.0030.00517.47
8.1.90.0070.00017.46
8.1.80.0000.00717.52
8.1.70.0000.00717.36
8.1.60.0000.00817.59
8.1.50.0040.00417.56
8.1.40.0080.00017.47
8.1.30.0040.00417.67
8.1.20.0040.00417.59
8.1.10.0040.00417.58
8.1.00.0040.00417.47
8.0.300.0050.00318.77
8.0.290.0040.00416.75
8.0.280.0000.00918.47
8.0.270.0000.00717.17
8.0.260.0030.00317.21
8.0.250.0070.00016.92
8.0.240.0030.00616.95
8.0.230.0030.00316.96
8.0.220.0000.00716.97
8.0.210.0030.00316.85
8.0.200.0030.00616.82
8.0.190.0000.00716.95
8.0.180.0000.00716.98
8.0.170.0080.00016.82
8.0.160.0000.00716.82
8.0.150.0090.00016.87
8.0.140.0000.00716.88
8.0.130.0060.00313.30
8.0.120.0050.00316.88
8.0.110.0040.00416.90
8.0.100.0000.00716.90
8.0.90.0020.00516.69
8.0.80.0120.00316.89
8.0.70.0070.00016.94
8.0.60.0070.00016.77
8.0.50.0040.00416.88
8.0.30.0090.00916.96
8.0.20.0090.01117.40
8.0.10.0050.00217.14
8.0.00.0100.01016.91
7.4.330.0050.00015.09
7.4.320.0030.00316.60
7.4.300.0040.00416.61
7.4.290.0000.00716.54
7.4.280.0000.00716.65
7.4.270.0000.00716.62
7.4.260.0040.00416.51
7.4.250.0000.00716.54
7.4.240.0030.00416.60
7.4.230.0030.00316.52
7.4.220.0100.00716.45
7.4.210.0000.01416.71
7.4.200.0000.00716.35
7.4.160.0120.00816.69
7.4.150.0100.00717.40
7.4.140.0120.00717.86
7.4.130.0100.01016.45
7.4.120.0110.00616.52
7.4.110.0100.00616.64
7.4.100.0110.01516.50
7.4.90.0120.00616.53
7.4.80.0130.01019.39
7.4.70.0090.01216.34
7.4.60.0060.01316.45
7.4.50.0040.00016.47
7.4.40.0060.00916.48
7.4.30.0100.00616.59
7.4.00.0080.00814.98
7.3.330.0000.00613.36
7.3.320.0070.00013.38
7.3.310.0040.00416.39
7.3.300.0030.00316.23
7.3.290.0110.00516.36
7.3.280.0100.00616.40
7.3.270.0060.01317.40
7.3.260.0090.00916.44
7.3.250.0080.01116.44
7.3.240.0060.01216.68
7.3.230.0130.00316.39
7.3.210.0090.00916.43
7.3.200.0030.01319.39
7.3.190.0140.00416.66
7.3.180.0060.01016.42
7.3.170.0100.00716.54
7.3.160.0110.00416.33
7.3.120.0040.01114.89
7.3.10.0090.00916.73
7.3.00.0050.00816.65
7.2.330.0110.01116.72
7.2.320.0100.00616.57
7.2.310.0130.01016.82
7.2.300.0100.00716.76
7.2.290.0170.00716.63
7.2.130.0060.00917.01
7.2.120.0030.01216.88
7.2.110.0030.01016.68
7.2.100.0070.00416.93
7.2.90.0090.00917.09
7.2.80.0070.00716.62
7.2.70.0070.00716.84
7.2.60.0070.00616.98
7.2.50.0070.00417.09
7.2.40.0100.00316.75
7.2.30.0000.01517.05
7.2.20.0070.00317.06
7.2.10.0040.01116.88
7.2.00.0050.00818.10
7.1.250.0040.00815.80
7.1.200.0040.00715.77
7.1.100.0000.00817.83
7.1.70.0030.00717.19
7.1.60.0030.00917.36
7.1.50.0000.02216.95
7.1.00.0070.07322.45
7.0.200.0000.00716.63
7.0.140.0030.07322.07
7.0.100.0130.03719.90
7.0.90.0030.04319.91
7.0.80.0130.07319.86
7.0.70.0100.07319.93
7.0.60.0270.04719.96
7.0.50.0270.07720.28
7.0.40.0100.07320.10
7.0.30.0070.08320.09
7.0.20.0070.06020.09
7.0.10.0070.08719.95
7.0.00.0100.05720.17
5.6.280.0000.07320.88
5.6.250.0030.05020.60
5.6.240.0170.08020.61
5.6.230.0170.04720.63
5.6.220.0030.05720.56
5.6.210.0070.07720.67
5.6.200.0070.06720.96
5.6.190.0070.05721.07
5.6.180.0170.06021.11
5.6.170.0070.05021.04
5.6.160.0100.04721.02
5.6.150.0170.06720.97
5.6.140.0100.06021.13
5.6.130.0070.08721.04
5.6.120.0200.05020.96
5.6.110.0130.08320.96
5.6.100.0170.03320.94
5.6.90.0030.05321.11
5.6.80.0070.06020.50
5.6.70.0230.02720.43
5.6.60.0070.04720.43
5.6.50.0070.04020.42
5.6.40.0000.06020.48
5.6.30.0070.04320.39
5.6.20.0070.07020.40
5.6.10.0070.05320.37
5.6.00.0100.03720.38
5.5.380.0070.08720.42
5.5.370.0070.04720.45
5.5.360.0100.04320.55
5.5.350.0200.06020.43
5.5.340.0130.07320.83
5.5.330.0100.04720.93
5.5.320.0100.06720.89
5.5.310.0100.08020.91
5.5.300.0100.08020.88
5.5.290.0070.07720.83
5.5.280.0100.07020.73
5.5.270.0170.06020.91
5.5.260.0100.06320.87
5.5.250.0030.05320.73
5.5.240.0070.04720.16
5.5.230.0130.03720.27
5.5.220.0100.03720.26
5.5.210.0070.03320.19
5.5.200.0070.03020.25
5.5.190.0130.04020.24
5.5.180.0100.03720.16
5.5.160.0130.04320.12
5.5.150.0030.07020.17
5.5.140.0130.06319.98
5.5.130.0070.06720.27
5.5.120.0100.03720.19
5.5.110.0030.04720.09
5.5.100.0000.05020.04
5.5.90.0070.04320.05
5.5.80.0070.07020.12
5.5.70.0070.05720.05
5.5.60.0030.05020.06
5.5.50.0070.04320.04
5.5.40.0000.07320.06
5.5.30.0030.05720.16
5.5.20.0030.05020.00
5.5.10.0130.03320.09
5.5.00.0100.06020.08
5.4.450.0100.08319.52
5.4.440.0030.05319.36
5.4.430.0130.03019.21
5.4.420.0070.07319.55
5.4.410.0070.05719.14
5.4.400.0130.04719.23
5.4.390.0170.04319.23
5.4.380.0070.08019.16
5.4.370.0030.04319.04
5.4.360.0000.04019.14
5.4.350.0070.07319.16
5.4.340.0030.04019.23
5.4.320.0100.04319.09
5.4.310.0070.04319.12
5.4.300.0030.04719.22
5.4.290.0100.07019.16
5.4.280.0070.05719.04
5.4.270.0170.05719.03
5.4.260.0070.06319.12
5.4.250.0270.05718.87
5.4.240.0030.07019.18
5.4.230.0100.06719.11
5.4.220.0070.07019.23
5.4.210.0200.04719.11
5.4.200.0130.06719.04
5.4.190.0070.05319.03
5.4.180.0100.07719.17
5.4.170.0100.07019.15
5.4.160.0130.04318.85
5.4.150.0130.03319.01
5.4.140.0070.06716.34
5.4.130.0000.04716.44
5.4.120.0130.03316.43
5.4.110.0000.04316.40
5.4.100.0030.04016.41
5.4.90.0070.03716.54
5.4.80.0100.02316.40
5.4.70.0100.02316.54
5.4.60.0100.03016.31
5.4.50.0030.03716.24
5.4.40.0030.03716.45
5.4.30.0030.03316.48
5.4.20.0070.02716.49
5.4.10.0000.03716.29
5.4.00.0030.03315.78
5.3.290.0070.04314.68
5.3.280.0170.07014.71
5.3.270.0030.06714.57
5.3.260.0100.05314.60
5.3.250.0070.07014.62
5.3.240.0070.05714.62
5.3.230.0030.05714.75
5.3.220.0100.03014.67
5.3.210.0070.04714.58
5.3.200.0030.04014.66
5.3.190.0030.04014.60
5.3.180.0000.04014.52
5.3.170.0070.04314.62
5.3.160.0070.04714.57
5.3.150.0070.03314.68
5.3.140.0030.03014.54
5.3.130.0030.04714.70
5.3.120.0100.03314.62
5.3.110.0030.03714.56
5.3.100.0000.04014.18
5.3.90.0000.03714.04
5.3.80.0070.03314.04
5.3.70.0030.03314.13
5.3.60.0000.03714.07
5.3.50.0130.02314.07
5.3.40.0030.05013.98
5.3.30.0070.03314.02
5.3.20.0030.05013.73
5.3.10.0130.05013.58
5.3.00.0100.03013.62
5.2.170.0000.06712.36
5.2.160.0030.04712.36
5.2.150.0130.04012.36
5.2.140.0070.02712.36
5.2.130.0030.03012.36
5.2.120.0030.04012.36
5.2.110.0030.02312.36
5.2.100.0030.03012.36
5.2.90.0130.03312.36
5.2.80.0000.03712.36
5.2.70.0100.05012.36
5.2.60.0070.02312.36
5.2.50.0070.04712.36
5.2.40.0030.05012.36
5.2.30.0030.03012.36
5.2.20.0100.03312.36
5.2.10.0100.03312.36
5.2.00.0030.06312.36
5.1.60.0100.04312.36
5.1.50.0070.03312.36
5.1.40.0100.05312.36
5.1.30.0030.03312.36
5.1.20.0170.04712.36
5.1.10.0030.05712.36
5.1.00.0100.04712.36
5.0.50.0030.04312.36
5.0.40.0000.03712.36
5.0.30.0070.03712.36
5.0.20.0130.03712.36
5.0.10.0000.04312.36
5.0.00.0070.05012.36
4.4.90.0070.01312.36
4.4.80.0030.03712.36
4.4.70.0030.02012.36
4.4.60.0000.04312.36
4.4.50.0070.01312.36
4.4.40.0030.05712.36
4.4.30.0000.04312.36
4.4.20.0000.03012.36
4.4.10.0100.02712.36
4.4.00.0000.04012.36
4.3.110.0100.02012.36
4.3.100.0000.04012.36
4.3.90.0000.02712.36
4.3.80.0070.02012.36
4.3.70.0070.03012.36
4.3.60.0070.01312.36
4.3.50.0000.03012.36
4.3.40.0030.04012.36
4.3.30.0030.02712.36
4.3.20.0000.02012.36
4.3.10.0000.04012.36
4.3.00.0130.02012.36

preferences:
48.54 ms | 401 KiB | 5 Q