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; } print_r("PermCount: " . $result); 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 = 'abcd'; $len = strlen($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)
8.3.70.0160.00316.50
8.3.60.0070.00716.63
8.3.50.0100.01121.99
8.3.40.0040.01218.92
8.3.30.0090.00619.09
8.3.20.0040.00420.34
8.3.10.0080.00023.67
8.3.00.0000.00822.40
8.2.180.0110.00418.14
8.2.170.0080.00822.96
8.2.160.0140.00020.38
8.2.150.0080.00024.18
8.2.140.0080.00024.66
8.2.130.0040.00426.16
8.2.120.0070.00022.11
8.2.110.0030.00721.11
8.2.100.0040.00818.03
8.2.90.0040.00419.21
8.2.80.0060.00317.97
8.2.70.0000.00817.63
8.2.60.0060.00318.16
8.2.50.0030.00518.10
8.2.40.0000.00818.22
8.2.30.0000.00718.22
8.2.20.0060.00317.63
8.2.10.0040.00417.79
8.2.00.0000.00717.80
8.1.280.0040.01125.92
8.1.270.0030.01024.02
8.1.260.0000.00826.35
8.1.250.0040.00428.09
8.1.240.0060.00322.21
8.1.230.0080.00417.83
8.1.220.0040.00417.79
8.1.210.0110.00618.77
8.1.200.0030.00617.38
8.1.190.0040.00417.23
8.1.180.0030.00618.10
8.1.170.0040.00418.71
8.1.160.0000.00821.96
8.1.150.0000.00818.59
8.1.140.0000.00717.45
8.1.130.0040.00417.81
8.1.120.0040.00417.51
8.1.110.0000.00817.39
8.1.100.0000.00817.50
8.1.90.0070.00017.39
8.1.80.0030.00317.34
8.1.70.0030.00317.36
8.1.60.0080.00017.57
8.1.50.0030.00517.46
8.1.40.0030.00517.51
8.1.30.0040.00417.53
8.1.20.0090.00017.71
8.1.10.0050.00317.62
8.1.00.0050.00317.46
8.0.300.0050.00218.77
8.0.290.0040.00416.88
8.0.280.0080.00018.53
8.0.270.0040.00417.18
8.0.260.0030.00316.82
8.0.250.0030.00317.01
8.0.240.0050.00316.96
8.0.230.0000.00716.93
8.0.220.0070.00016.91
8.0.210.0040.00416.93
8.0.200.0030.00317.06
8.0.190.0040.00416.91
8.0.180.0030.00516.97
8.0.170.0050.00216.91
8.0.160.0000.00716.89
8.0.150.0040.00416.89
8.0.140.0000.00716.82
8.0.130.0000.00713.46
8.0.120.0000.00816.86
8.0.110.0040.00416.84
8.0.100.0000.00816.99
8.0.90.0000.00716.90
8.0.80.0060.01216.93
8.0.70.0000.00716.89
8.0.60.0030.00516.84
8.0.50.0040.00416.79
8.0.30.0100.01017.19
8.0.20.0100.01017.40
8.0.10.0030.00517.00
8.0.00.0130.01016.60
7.4.330.0030.00315.12
7.4.320.0000.00716.66
7.4.300.0000.00616.57
7.4.290.0000.00816.61
7.4.280.0000.00716.55
7.4.270.0030.00516.63
7.4.260.0070.00016.54
7.4.250.0000.00816.68
7.4.240.0020.00516.64
7.4.230.0070.00016.47
7.4.220.0150.00316.54
7.4.210.0090.00716.62
7.4.200.0070.00016.68
7.4.190.0090.00016.46
7.4.160.0100.00716.38
7.4.150.0060.01217.40
7.4.140.0110.01017.86
7.4.130.0090.00816.61
7.4.120.0090.01016.53
7.4.110.0060.01216.36
7.4.100.0200.00716.53
7.4.90.0120.01216.55
7.4.80.0160.01019.39
7.4.70.0000.01716.57
7.4.60.0150.00616.46
7.4.50.0050.00016.45
7.4.40.0100.00722.77
7.4.30.0030.01316.61
7.4.00.0070.00715.05
7.3.330.0000.00613.40
7.3.320.0000.00513.40
7.3.310.0000.00816.26
7.3.300.0030.00316.30
7.3.290.0030.01416.44
7.3.280.0130.00616.42
7.3.270.0090.00917.40
7.3.260.0060.01216.64
7.3.250.0090.00916.54
7.3.240.0090.00916.53
7.3.230.0150.00316.47
7.3.210.0040.01416.45
7.3.200.0150.00819.39
7.3.190.0130.01016.54
7.3.180.0100.01016.37
7.3.170.0140.00716.68
7.3.160.0050.01416.56
7.3.120.0080.00814.76
7.2.330.0140.00616.75
7.2.320.0090.01016.52
7.2.310.0110.01216.60
7.2.300.0070.01316.52
7.2.290.0100.00716.53
7.2.00.0060.00919.43
7.1.200.0000.01315.75
7.1.100.0060.00617.95
7.1.70.0130.00017.00
7.1.60.0150.01119.29
7.1.50.0040.01517.06
7.1.00.0000.07722.51
7.0.200.0000.01016.81
7.0.140.0000.07721.99
7.0.60.0030.04019.95
7.0.50.0100.03717.90
7.0.40.0100.05020.24
7.0.30.0330.07320.17
7.0.20.0230.09020.16
7.0.10.0200.05720.15
7.0.00.0230.06720.06
5.6.280.0130.06721.00
5.6.210.0000.09020.73
5.6.200.0070.08018.19
5.6.190.0030.08720.33
5.6.180.0100.07720.43
5.6.170.0200.07720.55
5.6.160.0100.05020.48
5.6.150.0030.07318.14
5.6.140.0030.04718.25
5.6.130.0030.09018.23
5.6.120.0100.08721.15
5.6.110.0070.08320.97
5.6.100.0100.07021.12
5.6.90.0170.06021.09
5.6.80.0130.07020.54
5.6.70.0370.06720.48
5.5.350.0130.07320.43
5.5.340.0130.08017.98
5.5.330.0030.04320.27
5.5.320.0000.05020.27
5.5.310.0070.05020.32
5.5.300.0100.04718.01
5.5.290.0100.06018.05
5.5.280.0000.04720.69
5.5.270.0070.04720.77
5.5.260.0100.06320.84
5.5.250.0100.07020.56
5.5.240.0030.04020.37
5.4.450.0730.04019.43
5.4.440.0630.06719.34
5.4.430.0670.05319.47
5.4.420.0330.05319.34
5.4.410.0630.06019.35
5.4.400.0500.06019.29
5.4.390.0500.05319.25
5.4.380.0200.05018.62
5.4.370.0170.05318.75
5.4.360.0200.05018.55
5.4.350.0130.05718.85
5.4.340.0300.03718.46
5.4.320.0040.04612.52
5.4.310.0100.04212.52
5.4.300.0090.03412.52
5.4.290.0080.03612.52
5.4.280.0040.03812.39
5.4.270.0030.04012.39
5.4.260.0060.03912.39
5.4.250.0100.03412.39
5.4.240.0060.03712.39
5.4.230.0070.03812.39
5.4.220.0020.04012.39
5.4.210.0070.03512.38
5.4.200.0060.03812.38
5.4.190.0080.03512.38
5.4.180.0060.03612.38
5.4.170.0020.04112.39
5.4.160.0070.03612.38
5.4.150.0050.03712.38
5.4.140.0070.03812.06
5.4.130.0040.03812.05
5.4.120.0070.03612.01
5.4.110.0010.04112.00
5.4.100.0060.03612.00
5.4.90.0110.03512.01
5.4.80.0100.03512.01
5.4.70.0080.03412.00
5.4.60.0050.03712.00
5.4.50.0040.03912.00
5.4.40.0110.04211.98
5.4.30.0060.03811.98
5.4.20.0060.03811.98
5.4.10.0050.04011.98
5.4.00.0070.03711.48
5.3.290.0090.03812.80
5.3.280.0020.04212.71
5.3.270.0060.03912.72
5.3.260.0050.04012.72
5.3.250.0070.03712.72
5.3.240.0070.03712.72
5.3.230.0080.03712.71
5.3.220.0040.04112.68
5.3.210.0040.04012.68
5.3.200.0070.03712.68
5.3.190.0060.03712.68
5.3.180.0060.03812.67
5.3.170.0040.04012.67
5.3.160.0060.03712.67
5.3.150.0040.04012.67
5.3.140.0070.04012.66
5.3.130.0060.03912.66
5.3.120.0070.03812.66
5.3.110.0060.04012.66
5.3.100.0070.03712.12
5.3.90.0080.03412.10
5.3.80.0070.03712.09
5.3.70.0070.03712.08
5.3.60.0060.03612.07
5.3.50.0030.04012.02
5.3.40.0060.03812.02
5.3.30.0080.03511.98
5.3.20.0070.03511.76
5.3.10.0080.03411.73
5.3.00.0070.03711.71
5.2.170.0070.0299.21
5.2.160.0060.0299.21
5.2.150.0060.0309.21
5.2.140.0070.0359.21
5.2.130.0040.0309.17
5.2.120.0060.0279.17
5.2.110.0040.0339.17
5.2.100.0070.0409.18
5.2.90.0050.0439.17
5.2.80.0060.0439.16
5.2.70.0080.0409.15
5.2.60.0080.0299.11
5.2.50.0070.0299.09
5.2.40.0040.0339.06
5.2.30.0060.0339.03
5.2.20.0080.0289.02
5.2.10.0030.0328.93
5.2.00.0060.0298.80
5.1.60.0040.0318.08
5.1.50.0060.0258.08
5.1.40.0040.0268.07
5.1.30.0060.0318.41
5.1.20.0080.0318.44
5.1.10.0060.0368.16
5.1.00.0050.0288.16
5.0.50.0050.0256.65
5.0.40.0040.0216.50
5.0.30.0040.0376.32
5.0.20.0060.0216.29
5.0.10.0050.0246.27
5.0.00.0020.0376.26
4.4.90.0020.0174.78
4.4.80.0070.0184.76
4.4.70.0030.0174.76
4.4.60.0040.0214.76
4.4.50.0030.0184.77
4.4.40.0050.0274.71
4.4.30.0020.0204.75
4.4.20.0010.0204.85
4.4.10.0030.0174.85
4.4.00.0030.0274.76
4.3.110.0040.0164.67
4.3.100.0030.0194.66
4.3.90.0060.0144.63
4.3.80.0050.0254.58
4.3.70.0020.0194.63
4.3.60.0040.0184.63
4.3.50.0040.0164.63
4.3.40.0020.0314.54
4.3.30.0040.0193.32
4.3.20.0050.0223.31
4.3.10.0020.0233.26
4.3.00.0070.01713.43

preferences:
50.85 ms | 401 KiB | 5 Q