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 = 0; $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)
8.3.60.0120.00418.31
8.3.50.0130.00322.12
8.3.40.0120.00618.89
8.3.30.0040.01119.17
8.3.20.0000.00820.25
8.3.10.0080.00023.71
8.3.00.0040.00420.95
8.2.180.0070.00716.47
8.2.170.0110.00322.96
8.2.160.0030.01020.48
8.2.150.0080.00024.18
8.2.140.0000.00824.66
8.2.130.0040.00426.16
8.2.120.0030.00520.82
8.2.110.0050.00522.26
8.2.100.0120.00017.91
8.2.90.0040.00418.03
8.2.80.0000.00917.97
8.2.70.0000.00917.63
8.2.60.0030.00617.93
8.2.50.0000.00818.07
8.2.40.0030.00619.77
8.2.30.0040.00418.36
8.2.20.0000.00717.86
8.2.10.0040.00418.21
8.2.00.0040.00417.66
8.1.280.0040.01125.92
8.1.270.0040.00423.59
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0040.00420.90
8.1.230.0040.00720.79
8.1.220.0030.00517.79
8.1.210.0000.00818.91
8.1.200.0090.00317.23
8.1.190.0000.00817.22
8.1.180.0030.00618.10
8.1.170.0000.00818.59
8.1.160.0030.00521.90
8.1.150.0040.00418.56
8.1.140.0050.00317.50
8.1.130.0070.00017.74
8.1.120.0070.00017.54
8.1.110.0000.00717.32
8.1.100.0070.00017.45
8.1.90.0000.00717.43
8.1.80.0050.00217.45
8.1.70.0000.00717.34
8.1.60.0060.00317.48
8.1.50.0040.00417.48
8.1.40.0070.00017.54
8.1.30.0000.00817.58
8.1.20.0080.00017.64
8.1.10.0040.00417.49
8.1.00.0080.00017.41
8.0.300.0090.00019.90
8.0.290.0000.00716.63
8.0.280.0050.00318.50
8.0.270.0030.00317.23
8.0.260.0000.00817.15
8.0.250.0030.00316.99
8.0.240.0050.00316.85
8.0.230.0030.00316.82
8.0.220.0030.00316.97
8.0.210.0040.00416.94
8.0.200.0060.00016.85
8.0.190.0000.00916.89
8.0.180.0030.00516.85
8.0.170.0040.00416.93
8.0.160.0070.00016.84
8.0.150.0030.00716.89
8.0.140.0060.00316.89
8.0.130.0000.00613.26
8.0.120.0000.00816.82
8.0.110.0000.00716.87
8.0.100.0000.00716.94
8.0.90.0070.00016.90
8.0.80.0150.00616.91
8.0.70.0040.00416.70
8.0.60.0030.00316.81
8.0.50.0000.00817.01
8.0.30.0060.01317.07
8.0.20.0110.00817.40
8.0.10.0080.00017.02
8.0.00.0080.01216.81
7.4.330.0050.00015.01
7.4.320.0030.00316.53
7.4.300.0000.00716.64
7.4.290.0080.00016.60
7.4.280.0000.00716.61
7.4.270.0000.00716.54
7.4.260.0030.00616.57
7.4.250.0090.00016.52
7.4.240.0030.00516.45
7.4.230.0000.00716.48
7.4.220.0120.00616.50
7.4.210.0110.00416.60
7.4.200.0000.00716.37
7.4.160.0120.00316.36
7.4.150.0060.01217.40
7.4.140.0100.00717.86
7.4.130.0110.00516.45
7.4.120.0120.00516.58
7.4.110.0140.00316.38
7.4.100.0150.00916.55
7.4.90.0100.00716.43
7.4.80.0160.00319.39
7.4.70.0140.00416.68
7.4.60.0120.00916.49
7.4.50.0060.00316.63
7.4.40.0080.01116.43
7.4.30.0040.01316.51
7.4.10.0090.00314.77
7.4.00.0090.00815.08
7.3.330.0060.00013.21
7.3.320.0060.00013.19
7.3.310.0070.00016.39
7.3.300.0030.00316.32
7.3.290.0090.00916.39
7.3.280.0090.01016.37
7.3.270.0100.01417.40
7.3.260.0140.00716.62
7.3.250.0130.00716.41
7.3.240.0120.00916.62
7.3.230.0140.00416.57
7.3.210.0120.01116.49
7.3.200.0090.00619.39
7.3.190.0090.01316.54
7.3.180.0130.00316.65
7.3.170.0090.00716.50
7.3.160.0030.01216.57
7.3.130.0040.01514.75
7.3.120.0030.01014.84
7.3.110.0130.00715.11
7.3.100.0080.00814.53
7.3.90.0040.00814.87
7.3.80.0030.01014.98
7.3.70.0090.00614.99
7.3.60.0070.01014.83
7.3.50.0030.00515.01
7.3.40.0050.00514.86
7.3.30.0030.01014.97
7.3.20.0040.01116.78
7.3.10.0120.00116.60
7.3.00.0100.00616.67
7.2.330.0150.00316.78
7.2.320.0110.00716.75
7.2.310.0070.01016.69
7.2.300.0120.00816.68
7.2.290.0090.01116.55
7.2.260.0030.01414.73
7.2.250.0070.01315.04
7.2.240.0030.01214.73
7.2.230.0100.00715.14
7.2.220.0080.00815.32
7.2.210.0110.00415.08
7.2.200.0030.00614.96
7.2.190.0040.01115.05
7.2.180.0030.01015.00
7.2.170.0070.00715.03
7.2.160.0070.00715.25
7.2.150.0060.00916.95
7.2.140.0040.01116.77
7.2.130.0110.00717.03
7.2.120.0090.00716.94
7.2.110.0100.00816.92
7.2.100.0050.00816.90
7.2.90.0080.00916.85
7.2.80.0070.00717.06
7.2.70.0050.00917.05
7.2.60.0070.00717.04
7.2.50.0060.01017.02
7.2.40.0080.00817.04
7.2.30.0060.01017.05
7.2.20.0060.01016.94
7.2.10.0050.00816.96
7.2.00.0070.00817.85
7.1.330.0030.01015.83
7.1.320.0060.00615.87
7.1.310.0030.01015.92
7.1.300.0070.00715.60
7.1.290.0030.00915.57
7.1.280.0030.01015.84
7.1.270.0000.01415.86
7.1.260.0060.00615.83
7.1.250.0050.00915.87
7.1.240.0060.00915.71
7.1.230.0070.00715.88
7.1.220.0130.00815.67
7.1.210.0090.00815.84
7.1.200.0100.00315.64
7.1.190.0050.00915.66
7.1.180.0090.00715.80
7.1.170.0070.01015.86
7.1.160.0080.00715.83
7.1.150.0100.00715.90
7.1.140.0050.00815.71
7.1.130.0070.00315.79
7.1.120.0080.00815.80
7.1.110.0080.00815.90
7.1.100.0100.00616.71
7.1.90.0090.00815.82
7.1.80.0070.00815.92
7.1.70.0050.00716.30
7.1.60.0110.00716.95
7.1.50.0060.00915.95
7.1.40.0090.00415.72
7.1.30.0000.00915.79
7.1.20.0050.00615.77
7.1.10.0060.00715.81
7.1.00.0090.02418.10
7.0.330.0080.00315.22
7.0.320.0040.01015.32
7.0.310.0060.00915.48
7.0.300.0090.00515.28
7.0.290.0090.00715.32
7.0.280.0120.00515.30
7.0.270.0080.00915.19
7.0.260.0050.01115.31
7.0.250.0090.00615.41
7.0.240.0000.01315.36
7.0.230.0110.00615.54
7.0.220.0040.00915.45
7.0.210.0120.00015.46
7.0.200.0080.00515.86
7.0.190.0090.00415.43
7.0.180.0090.00515.52
7.0.170.0100.00715.51
7.0.160.0090.00415.50
7.0.150.0070.01015.33
7.0.140.0120.02917.66
7.0.130.0090.00815.38
7.0.120.0060.00615.46
7.0.110.0080.00615.47
7.0.100.0100.02717.03
7.0.90.0070.03416.77
7.0.80.0030.02116.82
7.0.70.0070.02916.91
7.0.60.0170.02816.93
7.0.50.0110.03317.06
7.0.40.0140.03215.78
7.0.30.0040.03415.66
7.0.20.0100.02915.85
7.0.10.0090.03515.77
7.0.00.0100.03515.72
5.6.400.0030.01014.21
5.6.390.0000.01214.61
5.6.380.0050.00914.63
5.6.370.0040.00614.39
5.6.360.0080.00514.57
5.6.350.0040.00914.09
5.6.340.0060.00914.18
5.6.330.0070.01214.67
5.6.320.0050.00714.54
5.6.310.0070.00914.68
5.6.300.0090.00914.53
5.6.290.0030.01014.43
5.6.280.0090.02816.48
5.6.270.0050.01014.40
5.6.260.0070.01014.45
5.6.250.0070.01716.53
5.6.240.0100.03216.32
5.6.230.0070.03216.51
5.6.220.0040.02816.40
5.6.210.0110.03316.29
5.6.200.0130.02816.59
5.6.190.0130.03216.50
5.6.180.0210.03116.65
5.6.170.0210.02716.52
5.6.160.0160.03316.54
5.6.150.0220.02416.54
5.6.140.0220.03016.67
5.6.130.0180.03116.70
5.6.120.0200.02116.60
5.6.110.0110.03316.55
5.6.100.0160.02216.63
5.6.90.0190.03316.56
5.6.80.0230.01716.36
5.6.70.0100.03716.33
5.6.60.0150.03116.43
5.6.50.0190.03116.45
5.6.40.0120.02416.40
5.6.30.0100.02916.35
5.6.20.0140.02616.31
5.6.10.0110.02616.18
5.6.00.0080.03116.25
5.5.380.0070.03115.32
5.5.370.0060.03115.42
5.5.360.0090.02915.40
5.5.350.0100.03315.41
5.5.340.0140.02915.48
5.5.330.0110.03115.67
5.5.320.0060.02415.67
5.5.310.0040.03415.54
5.5.300.0170.03215.43
5.5.290.0210.02815.39
5.5.280.0140.01915.43
5.5.270.0130.03015.57
5.5.260.0170.03015.52
5.5.250.0180.03015.49
5.5.240.0110.03315.13
5.5.230.0140.02615.07
5.5.220.0130.03115.21
5.5.210.0140.03115.20
5.5.200.0090.03115.34
5.5.190.0100.01715.23
5.5.180.0050.03015.23
5.5.170.0070.00512.95
5.5.160.0080.02915.19
5.5.150.0080.03015.23
5.5.140.0090.03015.21
5.5.130.0150.02715.21
5.5.120.0070.02115.06
5.5.110.0080.02915.27
5.5.100.0050.02915.14
5.5.90.0130.02815.13
5.5.80.0060.02515.18
5.5.70.0060.03215.05
5.5.60.0090.02115.06
5.5.50.0060.03315.23
5.5.40.0090.02915.12
5.5.30.0040.03215.21
5.5.20.0110.03015.26
5.5.10.0090.02815.09
5.5.00.0080.02915.03
5.4.450.0070.03014.88
5.4.440.0070.03414.83
5.4.430.0120.03014.88
5.4.420.0080.02714.77
5.4.410.0060.02514.78
5.4.400.0110.02614.63
5.4.390.0110.02714.65
5.4.380.0090.02614.65
5.4.370.0150.02514.68
5.4.360.0060.02414.54
5.4.350.0080.02714.72
5.4.340.0050.03014.68
5.4.330.0090.00512.39
5.4.320.0060.02914.69
5.4.310.0030.03414.58
5.4.300.0090.03214.60
5.4.290.0080.02914.63
5.4.280.0060.02914.65
5.4.270.0120.02314.68
5.4.260.0050.02914.76
5.4.250.0110.02614.71
5.4.240.0100.02614.56
5.4.230.0060.03014.70
5.4.220.0120.02514.77
5.4.210.0080.02814.60
5.4.200.0060.01914.59
5.4.190.0040.03114.70
5.4.180.0080.02914.71
5.4.170.0060.02214.73
5.4.160.0060.03014.68
5.4.150.0060.03014.75
5.4.140.0070.01813.78
5.4.130.0080.02813.67
5.4.120.0100.02213.92
5.4.110.0060.02913.75
5.4.100.0140.02513.75
5.4.90.0130.03013.70
5.4.80.0090.02213.75
5.4.70.0070.02813.78
5.4.60.0070.02913.74
5.4.50.0100.02613.81
5.4.40.0040.03113.62
5.4.30.0130.02113.79
5.4.20.0070.02613.68
5.4.10.0090.02313.71
5.4.00.0100.02713.58
5.3.290.0090.02812.99
5.3.280.0040.03113.02
5.3.270.0120.02013.08
5.3.260.0100.03112.99
5.3.250.0110.02513.05
5.3.240.0090.02613.02
5.3.230.0050.03513.06
5.3.220.0060.02812.92
5.3.210.0090.02913.00
5.3.200.0100.02912.95
5.3.190.0050.03212.99
5.3.180.0130.02213.11
5.3.170.0060.02812.94
5.3.160.0100.02313.04
5.3.150.0040.03113.07
5.3.140.0060.02012.93
5.3.130.0050.02812.94
5.3.120.0040.02412.93
5.3.110.0010.03213.00
5.3.100.0060.03112.92
5.3.90.0090.02512.85
5.3.80.0090.02012.77
5.3.70.0060.02512.76
5.3.60.0020.01912.76
5.3.50.0100.02312.74
5.3.40.0080.02812.84
5.3.30.0050.02612.84
5.3.20.0060.02812.66
5.3.10.0080.01912.62
5.3.00.0060.02312.51
5.2.170.0030.03310.66
5.2.160.0090.03010.60
5.2.150.0030.03610.60
5.2.140.0070.03210.53
5.2.130.0030.02810.58
5.2.120.0090.03410.61
5.2.110.0090.02910.60
5.2.100.0020.03510.52
5.2.90.0100.02810.52
5.2.80.0070.03210.57
5.2.70.0030.03610.52
5.2.60.0080.02310.61
5.2.50.0080.03010.47
5.2.40.0060.03310.54
5.2.30.0120.01810.56
5.2.20.0050.03410.47
5.2.10.0080.03510.46
5.2.00.0100.02810.41
5.1.60.0060.01610.01
5.1.50.0090.02510.01
5.1.40.0050.0299.95
5.1.30.0080.03010.16
5.1.20.0050.03110.25
5.1.10.0050.03010.04
5.1.00.0090.01710.08
5.0.50.0060.0239.35
5.0.40.0120.0159.30
5.0.30.0020.0359.30
5.0.20.0020.0229.30
5.0.10.0050.0189.30
5.0.00.0050.0349.30
4.4.90.0060.0189.30
4.4.80.0070.0189.30
4.4.70.0040.0139.30
4.4.60.0040.0189.30
4.4.50.0020.0209.30
4.4.40.0000.0349.30
4.4.30.0040.0189.30
4.4.20.0070.0159.30
4.4.10.0020.0199.30
4.4.00.0030.0289.30
4.3.110.0050.0179.30
4.3.100.0030.0159.30
4.3.90.0050.0189.30
4.3.80.0030.0309.30
4.3.70.0030.0189.30
4.3.60.0030.0139.30
4.3.50.0020.0199.30
4.3.40.0030.0289.30
4.3.30.0030.0209.30
4.3.20.0060.0179.30
4.3.10.0020.0179.30
4.3.00.0040.0149.30

preferences:
46.88 ms | 401 KiB | 5 Q