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)); 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)
8.3.60.0100.01018.43
8.3.50.0160.00521.14
8.3.40.0090.00618.98
8.3.30.0060.00920.00
8.3.20.0040.00418.91
8.3.10.0040.00421.27
8.3.00.0040.00423.66
8.2.180.0110.00416.88
8.2.170.0070.00722.96
8.2.160.0070.00720.52
8.2.150.0030.00625.66
8.2.140.0040.00424.66
8.2.130.0030.00626.16
8.2.120.0040.00419.95
8.2.110.0100.00021.00
8.2.100.0060.00619.71
8.2.90.0030.00619.30
8.2.80.0030.00617.97
8.2.70.0030.00517.63
8.2.60.0040.00418.03
8.2.50.0000.00918.10
8.2.40.0040.00422.20
8.2.30.0080.00319.45
8.2.20.0050.00217.71
8.2.10.0000.00817.68
8.2.00.0060.00317.63
8.1.280.0060.00925.92
8.1.270.0000.00823.99
8.1.260.0030.00526.35
8.1.250.0000.00728.09
8.1.240.0150.00621.29
8.1.230.0030.00919.36
8.1.220.0030.00517.78
8.1.210.0040.00418.77
8.1.200.0030.00617.35
8.1.190.0000.00817.35
8.1.180.0000.00918.10
8.1.170.0050.00318.50
8.1.160.0000.00722.02
8.1.150.0000.00718.52
8.1.140.0000.00817.52
8.1.130.0000.00617.79
8.1.120.0040.00417.46
8.1.110.0000.00817.36
8.1.100.0000.00717.49
8.1.90.0050.00317.50
8.1.80.0080.00017.54
8.1.70.0030.00317.36
8.1.60.0000.00917.65
8.1.50.0040.00417.35
8.1.40.0020.00517.54
8.1.30.0000.00917.53
8.1.20.0090.00017.48
8.1.10.0030.00617.52
8.1.00.0040.00417.54
8.0.300.0000.00718.77
8.0.290.0040.00416.75
8.0.280.0040.00418.46
8.0.270.0000.00717.27
8.0.260.0030.00316.75
8.0.250.0040.00416.98
8.0.240.0060.00316.96
8.0.230.0030.00317.00
8.0.220.0080.00016.90
8.0.210.0040.00416.77
8.0.200.0020.00517.00
8.0.190.0050.00516.89
8.0.180.0060.00316.91
8.0.170.0000.00816.84
8.0.160.0040.00416.97
8.0.150.0040.00416.74
8.0.140.0030.00616.75
8.0.130.0000.00613.39
8.0.120.0070.00016.81
8.0.110.0040.00416.78
8.0.100.0070.00016.71
8.0.90.0000.00716.85
8.0.80.0090.00616.88
8.0.70.0000.00716.88
8.0.60.0000.00716.72
8.0.50.0000.00716.93
8.0.30.0110.00717.21
8.0.20.0130.00617.40
8.0.10.0050.00317.05
8.0.00.0060.01716.76
7.4.330.0050.00016.77
7.4.320.0070.00016.64
7.4.300.0030.00316.51
7.4.290.0030.00316.65
7.4.280.0030.00316.49
7.4.270.0000.00716.53
7.4.260.0050.00013.35
7.4.250.0050.00316.46
7.4.240.0020.00516.52
7.4.230.0030.00316.59
7.4.220.0060.01316.58
7.4.210.0080.00716.52
7.4.200.0030.00316.50
7.4.190.0000.00816.47
7.4.160.0150.00616.39
7.4.150.0030.01317.40
7.4.140.0100.01317.86
7.4.130.0070.01416.56
7.4.120.0050.01216.39
7.4.110.0060.01016.80
7.4.100.0120.01416.50
7.4.90.0120.00616.48
7.4.80.0120.01219.39
7.4.70.0130.00716.37
7.4.60.0040.01516.51
7.4.50.0040.00416.57
7.4.40.0070.01022.77
7.4.30.0060.01216.69
7.4.00.0080.00814.92
7.3.330.0000.00513.29
7.3.320.0030.00313.20
7.3.310.0050.00216.38
7.3.300.0040.00416.27
7.3.290.0120.00316.39
7.3.280.0100.00816.37
7.3.270.0060.01017.40
7.3.260.0070.01318.24
7.3.250.0100.00816.51
7.3.240.0030.01316.44
7.3.230.0030.01316.42
7.3.210.0090.01316.37
7.3.200.0120.00919.39
7.3.190.0060.01616.61
7.3.180.0080.00816.34
7.3.170.0030.01716.33
7.3.160.0040.01116.46
7.3.120.0080.00814.64
7.3.110.0100.00615.15
7.3.100.0000.01514.62
7.3.90.0080.00414.61
7.3.80.0100.00314.77
7.3.70.0030.00614.69
7.3.60.0090.00614.84
7.3.50.0040.00714.93
7.3.40.0070.00714.85
7.3.30.0060.01014.70
7.3.20.0040.00816.74
7.3.10.0040.01116.58
7.3.00.0000.01216.61
7.2.330.0090.00916.60
7.2.320.0180.00016.84
7.2.310.0060.01516.76
7.2.300.0070.01016.75
7.2.290.0070.01016.74
7.2.250.0070.01315.26
7.2.240.0090.00914.89
7.2.230.0030.00915.15
7.2.220.0030.01114.95
7.2.210.0030.01315.29
7.2.200.0060.00615.21
7.2.190.0000.01614.96
7.2.180.0070.00315.15
7.2.170.0040.01114.89
7.2.00.0000.01419.49
7.1.330.0060.00615.70
7.1.320.0040.01115.79
7.1.310.0080.00815.61
7.1.300.0040.00815.44
7.1.290.0000.01415.79
7.1.280.0000.01315.66
7.1.270.0000.01615.89
7.1.260.0090.00615.92
7.1.100.0040.00718.02
7.1.70.0000.00717.23
7.1.60.0030.02119.17
7.1.50.0140.01116.91
7.1.00.0000.03722.45
7.0.200.0000.00816.48
7.0.140.0130.06322.08
7.0.100.0400.07019.95
7.0.90.0030.05020.01
7.0.80.0370.07320.14
7.0.70.0070.04319.93
7.0.60.0070.03719.94
7.0.50.0070.05020.30
7.0.40.0070.04720.13
7.0.30.0070.04320.05
7.0.20.0070.04320.04
7.0.10.0100.03320.14
7.0.00.0000.08720.17
5.6.280.0030.07320.86
5.6.250.0070.07320.82
5.6.240.0070.08020.73
5.6.230.0030.06320.66
5.6.220.0130.03720.64
5.6.210.0070.04320.57
5.6.200.0000.05320.95
5.6.190.0100.05721.06
5.6.180.0170.03320.96
5.6.170.0070.03721.14
5.6.160.0130.07021.18
5.6.150.0030.08721.09
5.6.140.0030.04721.07
5.6.130.0070.04320.93
5.6.120.0170.06020.96
5.6.110.0130.06321.10
5.6.100.0100.07721.16
5.6.90.0070.08021.12
5.6.80.0200.04720.49
5.6.70.0070.04720.43
5.6.60.0230.07020.39
5.6.50.0130.06720.47
5.6.40.0030.06720.46
5.6.30.0030.08320.40
5.6.20.0200.08020.41
5.6.10.0130.08320.38
5.6.00.0100.07320.37
5.5.380.0230.06020.36
5.5.370.0100.08720.50
5.5.360.0100.04020.42
5.5.350.0030.04320.48
5.5.340.0100.04320.86
5.5.330.0000.04720.89
5.5.320.0070.04320.93
5.5.310.0070.04020.85
5.5.300.0170.07020.87
5.5.290.0100.08320.76
5.5.280.0070.07320.82
5.5.270.0130.07320.76
5.5.260.0170.08020.86
5.5.250.0130.06020.59
5.5.240.0130.06720.29
5.5.230.0030.04320.11
5.5.220.0030.09020.27
5.5.210.0130.07320.02
5.5.200.0100.06320.22
5.5.190.0070.08720.27
5.5.180.0070.05320.14
5.5.160.0070.07720.19
5.5.150.0000.06320.16
5.5.140.0170.07720.21
5.5.130.0130.07320.22
5.5.120.0100.05320.21
5.5.110.0170.05320.07
5.5.100.0100.06319.98
5.5.90.0070.07720.11
5.5.80.0100.07320.02
5.5.70.0130.07320.06
5.5.60.0070.06320.15
5.5.50.0100.07720.04
5.5.40.0070.08720.16
5.5.30.0070.07720.10
5.5.20.0170.07020.11
5.5.10.0070.08020.03
5.5.00.0000.08020.04
5.4.450.0070.06319.56
5.4.440.0170.07319.38
5.4.430.0130.07319.36
5.4.420.0100.07319.19
5.4.410.0100.07319.41
5.4.400.0000.04319.12
5.4.390.0100.07719.09
5.4.380.0070.06719.24
5.4.370.0070.05019.22
5.4.360.0130.07018.91
5.4.350.0000.07719.18
5.4.340.0070.07718.85
5.4.320.0070.08019.18
5.4.310.0100.08319.16
5.4.300.0070.06319.01
5.4.290.0000.07319.04
5.4.280.0070.04719.16
5.4.270.0130.07319.20
5.4.260.0100.06319.03
5.4.250.0070.06319.16
5.4.240.0100.06718.90
5.4.230.0100.07319.11
5.4.220.0130.05719.12
5.4.210.0100.07719.21
5.4.200.0030.04718.84
5.4.190.0130.06719.13
5.4.180.0130.06019.11
5.4.170.0070.06719.19
5.4.160.0070.06719.14
5.4.150.0100.06319.10
5.4.140.0100.04716.33
5.4.130.0100.06016.42
5.4.120.0130.06716.41
5.4.110.0030.07716.54
5.4.100.0070.06316.40
5.4.90.0000.06016.52
5.4.80.0100.07016.53
5.4.70.0170.06016.38
5.4.60.0100.03716.46
5.4.50.0070.07016.48
5.4.40.0070.05716.41
5.4.30.0070.06016.45
5.4.20.0100.06316.40
5.4.10.0030.08016.48
5.4.00.0070.06315.84
5.3.290.0100.07314.72
5.3.280.0130.07714.66
5.3.270.0130.07314.54
5.3.260.0100.05714.56
5.3.250.0000.06714.63
5.3.240.0100.08314.62
5.3.230.0070.07714.54
5.3.220.0170.06014.53
5.3.210.0100.08014.58
5.3.200.0130.06314.61
5.3.190.0130.07714.53
5.3.180.0070.07014.55
5.3.170.0170.06314.59
5.3.160.0200.04314.68
5.3.150.0130.06314.59
5.3.140.0030.06314.63
5.3.130.0100.07314.70
5.3.120.0030.06314.58
5.3.110.0070.04314.62
5.3.100.0100.07013.98
5.3.90.0100.04314.00
5.3.80.0030.08714.16
5.3.70.0030.04714.03
5.3.60.0200.06714.11
5.3.50.0100.03713.84
5.3.40.0100.03713.97
5.3.30.0070.07313.98
5.3.20.0130.07313.71
5.3.10.0070.06013.67
5.3.00.0030.08013.77
5.2.170.0030.06712.19
5.2.160.0130.04712.19
5.2.150.0070.02712.19
5.2.140.0100.06012.19
5.2.130.0100.04712.19
5.2.120.0100.06312.19
5.2.110.0030.06312.19
5.2.100.0000.04312.19
5.2.90.0130.04712.19
5.2.80.0030.06712.19
5.2.70.0030.04312.19
5.2.60.0100.05712.19
5.2.50.0030.06312.19
5.2.40.0030.06012.19
5.2.30.0030.04712.19
5.2.20.0100.05712.19
5.2.10.0070.05712.19
5.2.00.0070.04312.19
5.1.60.0100.05012.19
5.1.50.0100.03712.19
5.1.40.0030.05312.19
5.1.30.0100.04312.19
5.1.20.0170.04712.19
5.1.10.0100.05012.19
5.1.00.0230.04012.19
5.0.50.0030.03712.19
5.0.40.0030.04312.19
5.0.30.0030.06012.19
5.0.20.0070.04312.19
5.0.10.0000.04012.19
5.0.00.0030.06012.19
4.4.90.0030.03312.19
4.4.80.0030.03012.19
4.4.70.0000.03712.19
4.4.60.0030.02712.19
4.4.50.0030.03312.19
4.4.40.0030.05712.19
4.4.30.0030.02312.19
4.4.20.0030.02012.19
4.4.10.0030.03312.19
4.4.00.0070.05012.19
4.3.110.0070.02312.19
4.3.100.0100.02312.19
4.3.90.0000.04012.19
4.3.80.0070.05312.19
4.3.70.0070.03012.19
4.3.60.0030.03712.19
4.3.50.0000.03312.19
4.3.40.0000.04312.19
4.3.30.0000.02712.19
4.3.20.0000.04012.19
4.3.10.0000.03012.19
4.3.00.0000.03712.19

preferences:
47.31 ms | 401 KiB | 5 Q