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) { $result = []; for($i = 0; $i < $count; $i++) { $pos = $index % strlen($letters); $result[] = $letters[$pos]; $index = ($index-$pos)/strlen($letters); $letters = substr($letters, 0, $pos) . substr($letters, $pos+1); } return sort($result); } $letters = 'abc'; $r = array(); //echo '1 letters from 4: '; for($i = 0; $i < getPermCount($letters, 1); $i++) $r[] = getPerm($letters, 1, $i); //echo '2 letters from 4: '; for($i = 0; $i < getPermCount($letters, 2); $i++) $r[] = getPerm($letters, 2, $i); //echo ' 3 letters from 4: '; for($i = 0; $i < getPermCount($letters, 3); $i++) $r[] = getPerm($letters, 3, $i); print_r(array_unique($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)
8.3.60.0170.00318.12
8.3.50.0070.01021.14
8.3.40.0030.01418.80
8.3.30.0070.01320.31
8.3.20.0080.00018.78
8.3.10.0090.00021.04
8.3.00.0070.01522.41
8.2.180.0150.00616.63
8.2.170.0110.00322.96
8.2.160.0070.01320.43
8.2.150.0080.00024.18
8.2.140.0080.00024.66
8.2.130.0080.00026.16
8.2.120.0110.00719.75
8.2.110.0060.00321.06
8.2.100.0060.00617.91
8.2.90.0060.00319.22
8.2.80.0000.00719.34
8.2.70.0000.00817.75
8.2.60.0040.00417.93
8.2.50.0050.00318.07
8.2.40.0070.00318.22
8.2.30.0040.00419.51
8.2.20.0000.00717.63
8.2.10.0000.00717.82
8.2.00.0050.00317.74
8.1.280.0070.00725.92
8.1.270.0040.01423.99
8.1.260.0110.00726.35
8.1.250.0070.01128.09
8.1.240.0050.00519.46
8.1.230.0040.00720.97
8.1.220.0080.00018.77
8.1.210.0050.00318.77
8.1.200.0030.00717.13
8.1.190.0040.00417.39
8.1.180.0040.00418.10
8.1.170.0000.00818.66
8.1.160.0000.00818.88
8.1.150.0000.00818.51
8.1.140.0050.00217.36
8.1.130.0070.00017.87
8.1.120.0000.00717.48
8.1.110.0000.00817.37
8.1.100.0000.00717.36
8.1.90.0040.00417.36
8.1.80.0040.00417.37
8.1.70.0030.00317.34
8.1.60.0040.00417.57
8.1.50.0040.00417.41
8.1.40.0080.00017.42
8.1.30.0020.00517.64
8.1.20.0040.00417.66
8.1.10.0000.00817.54
8.1.00.0070.00417.52
8.0.300.0000.00820.08
8.0.290.0070.00017.16
8.0.280.0000.00818.44
8.0.270.0000.00717.16
8.0.260.0070.00016.72
8.0.250.0070.00016.96
8.0.240.0000.00816.92
8.0.230.0000.00716.91
8.0.220.0060.00316.90
8.0.210.0030.00516.82
8.0.200.0000.00716.84
8.0.190.0000.00816.93
8.0.180.0080.00016.90
8.0.170.0040.00416.78
8.0.160.0070.00016.91
8.0.150.0000.00716.79
8.0.140.0040.00416.75
8.0.130.0060.00013.40
8.0.120.0000.00916.86
8.0.110.0060.00316.92
8.0.100.0070.00016.92
8.0.90.0040.00417.01
8.0.80.0060.00916.83
8.0.70.0040.00416.92
8.0.60.0030.00616.93
8.0.50.0040.00416.92
8.0.30.0120.00717.22
8.0.20.0110.00817.40
8.0.10.0040.00417.01
8.0.00.0090.00916.74
7.4.330.0020.00216.77
7.4.320.0000.00816.62
7.4.300.0030.00316.46
7.4.290.0030.00316.42
7.4.280.0000.00716.59
7.4.270.0060.00316.60
7.4.260.0050.00013.28
7.4.250.0050.00316.45
7.4.240.0030.00516.54
7.4.230.0050.00316.63
7.4.220.0150.00616.46
7.4.210.0090.00616.59
7.4.200.0070.00016.32
7.4.190.0000.00716.77
7.4.160.0070.01016.53
7.4.150.0130.00717.40
7.4.140.0060.01017.86
7.4.130.0120.00916.60
7.4.120.0160.00316.46
7.4.110.0140.00716.46
7.4.100.0140.00716.53
7.4.90.0150.00416.56
7.4.80.0030.01319.39
7.4.70.0090.00916.46
7.4.60.0090.00816.57
7.4.50.0050.00316.61
7.4.40.0040.00822.77
7.4.30.0090.00916.62
7.4.10.0060.01315.03
7.4.00.0100.00714.84
7.3.330.0000.00613.35
7.3.320.0060.00013.20
7.3.310.0000.00716.41
7.3.300.0070.00016.45
7.3.290.0080.00716.37
7.3.280.0130.00516.41
7.3.270.0040.01417.40
7.3.260.0110.00818.24
7.3.250.0150.01016.51
7.3.240.0140.00316.62
7.3.230.0130.00316.66
7.3.210.0070.01416.42
7.3.200.0130.00319.39
7.3.190.0060.01116.43
7.3.180.0080.00816.40
7.3.170.0030.01616.64
7.3.160.0060.01016.45
7.3.130.0070.01014.87
7.3.120.0070.00514.74
7.3.110.0090.00914.74
7.3.100.0110.00614.96
7.3.90.0090.00714.92
7.3.80.0030.01214.93
7.3.70.0050.00714.85
7.3.60.0060.01114.80
7.3.50.0060.00814.82
7.3.40.0080.00714.71
7.3.30.0050.00914.63
7.3.20.0000.01316.60
7.3.10.0060.00516.53
7.3.00.0060.00816.67
7.2.330.0040.01416.77
7.2.320.0030.01516.79
7.2.310.0060.01216.57
7.2.300.0080.00816.72
7.2.290.0060.01816.78
7.2.260.0110.00715.06
7.2.250.0070.01215.09
7.2.240.0070.01015.20
7.2.230.0050.01014.90
7.2.220.0130.00315.03
7.2.210.0050.01115.01
7.2.200.0100.00715.07
7.2.190.0060.00814.99
7.2.180.0080.00815.12
7.2.170.0120.00315.13
7.2.160.0000.00915.09
7.2.150.0040.01117.16
7.2.140.0100.00617.06
7.2.130.0000.01816.95
7.2.120.0060.00916.99
7.2.110.0070.00716.98
7.2.100.0030.00717.07
7.2.90.0030.00617.13
7.2.80.0040.00717.07
7.2.70.0070.01017.02
7.2.60.0080.00716.97
7.2.50.0030.01216.93
7.2.40.0150.00016.81
7.2.30.0070.00717.05
7.2.20.0050.00517.05
7.2.10.0040.01117.08
7.2.00.0040.00818.09
7.1.330.0020.01215.80
7.1.320.0100.00715.83
7.1.310.0070.00715.69
7.1.300.0060.00915.66
7.1.290.0110.00315.70
7.1.280.0060.01015.68
7.1.270.0070.00715.69
7.1.260.0050.01115.74
7.1.250.0000.01515.73
7.1.240.0070.00715.91
7.1.230.0040.00715.54
7.1.220.0030.00915.75
7.1.210.0090.00015.88
7.1.200.0060.00515.62
7.1.190.0120.00315.73
7.1.180.0040.01115.85
7.1.170.0040.01115.82
7.1.160.0100.00315.80
7.1.150.0060.01215.91
7.1.140.0080.00315.71
7.1.130.0070.00715.73
7.1.120.0030.01015.98
7.1.110.0070.00716.05
7.1.100.0070.00717.01
7.1.90.0060.00916.04
7.1.80.0070.00415.92
7.1.70.0030.00716.34
7.1.60.0040.00717.42
7.1.50.0050.01216.36
7.1.40.0140.00015.84
7.1.30.0000.00915.81
7.1.20.0000.01015.61
7.1.10.0070.00715.98
7.1.00.0030.04319.14
7.0.330.0060.00615.48
7.0.320.0000.01215.54
7.0.310.0100.01015.14
7.0.300.0030.01015.21
7.0.290.0030.01015.42
7.0.280.0070.00415.32
7.0.270.0080.00615.16
7.0.260.0040.00415.40
7.0.250.0060.00615.36
7.0.240.0060.00315.57
7.0.230.0030.00615.42
7.0.220.0000.01415.46
7.0.210.0060.00315.18
7.0.200.0020.00815.83
7.0.190.0070.00715.42
7.0.180.0060.00915.45
7.0.170.0030.00515.62
7.0.160.0060.00315.36
7.0.150.0100.00315.52
7.0.140.0030.04018.55
7.0.130.0060.00915.34
7.0.120.0100.00315.44
7.0.110.0050.00515.57
7.0.100.0030.04017.73
7.0.90.0180.02117.70
7.0.80.0200.02317.63
7.0.70.0260.02217.63
7.0.60.0170.02317.77
7.0.50.0120.02318.03
7.0.40.0050.02516.71
7.0.30.0030.02616.84
7.0.20.0030.02516.77
7.0.10.0070.02316.85
7.0.00.0030.02616.56
5.6.400.0070.00614.57
5.6.390.0030.01014.65
5.6.380.0030.01013.99
5.6.370.0100.00714.61
5.6.360.0060.00914.65
5.6.350.0000.01514.55
5.6.340.0030.00914.12
5.6.330.0110.00614.39
5.6.320.0070.00714.82
5.6.310.0030.01514.28
5.6.300.0090.00914.64
5.6.290.0040.01214.11
5.6.280.0050.05217.78
5.6.270.0100.00314.56
5.6.260.0100.00314.71
5.6.250.0080.03117.50
5.6.240.0100.02217.55
5.6.230.0070.02317.53
5.6.220.0020.03617.42
5.6.210.0090.03017.56
5.6.200.0040.02917.71
5.6.190.0020.02717.71
5.6.180.0080.03817.73
5.6.170.0060.02517.66
5.6.160.0110.01717.70
5.6.150.0030.02517.70
5.6.140.0050.02517.57
5.6.130.0030.03917.71
5.6.120.0070.02417.76
5.6.110.0050.04317.74
5.6.100.0030.02417.67
5.6.90.0060.03117.63
5.6.80.0030.02617.27
5.6.70.0030.02417.45
5.6.60.0030.03817.37
5.6.50.0010.04817.42
5.6.40.0060.04117.47
5.6.30.0020.04417.52
5.6.20.0130.01717.38
5.6.10.0070.04217.37
5.6.00.0070.02517.42
5.5.380.0050.03017.37
5.5.370.0070.02017.45
5.5.360.0060.02517.43
5.5.350.0040.02617.36
5.5.340.0020.02717.63
5.5.330.0000.02917.54
5.5.320.0020.02717.63
5.5.310.0070.02317.59
5.5.300.0070.02317.56
5.5.290.0080.02117.65
5.5.280.0060.02617.60
5.5.270.0030.02517.63
5.5.260.0080.02317.60
5.5.250.0090.02417.39
5.5.240.0030.02417.34
5.5.230.0050.02417.28
5.5.220.0030.02617.33
5.5.210.0050.04317.43
5.5.200.0080.02217.16
5.5.190.0080.03517.34
5.5.180.0050.02317.27
5.5.170.0120.00314.43
5.5.160.0110.03817.15
5.5.150.0000.04617.35
5.5.140.0020.04617.16
5.5.130.0100.03817.14
5.5.120.0080.04017.34
5.5.110.0070.03017.45
5.5.100.0100.02517.20
5.5.90.0080.02917.19
5.5.80.0110.04317.12
5.5.70.0080.04017.15
5.5.60.0050.03517.24
5.5.50.0070.04017.32
5.5.40.0050.04017.26
5.5.30.0040.04417.17
5.5.20.0070.03517.12
5.5.10.0070.04217.19
5.5.00.0100.03717.36
5.4.450.0070.03615.36
5.4.440.0080.02215.33
5.4.430.0040.03515.46
5.4.420.0020.02515.41
5.4.410.0000.02715.17
5.4.400.0050.02214.96
5.4.390.0070.03615.12
5.4.380.0050.02214.95
5.4.370.0030.04315.24
5.4.360.0050.04215.07
5.4.350.0060.03114.97
5.4.340.0070.03315.12
5.4.330.0060.00611.39
5.4.320.0030.04314.92
5.4.310.0040.03715.03
5.4.300.0110.03115.08
5.4.290.0030.03514.94
5.4.280.0050.03815.13
5.4.270.0050.04115.05
5.4.260.0030.03415.07
5.4.250.0050.04015.26
5.4.240.0030.04115.25
5.4.230.0030.03815.24
5.4.220.0030.04015.03
5.4.210.0070.02515.05
5.4.200.0020.04015.17
5.4.190.0050.02715.02
5.4.180.0070.03515.06
5.4.170.0060.03215.11
5.4.160.0090.03414.97
5.4.150.0050.04415.13
5.4.140.0020.02713.95
5.4.130.0060.01913.76
5.4.120.0060.01913.85
5.4.110.0050.03513.85
5.4.100.0070.03513.83
5.4.90.0050.03513.88
5.4.80.0100.02613.72
5.4.70.0080.03513.88
5.4.60.0010.04113.75
5.4.50.0050.03813.63
5.4.40.0020.04113.73
5.4.30.0030.04113.90
5.4.20.0000.04213.69
5.4.10.0120.03013.84
5.4.00.0050.04113.55
5.3.290.0030.02512.35
5.3.280.0030.03612.39
5.3.270.0090.03512.46
5.3.260.0030.04112.50
5.3.250.0070.03912.42
5.3.240.0050.04112.42
5.3.230.0060.03812.38
5.3.220.0060.03012.42
5.3.210.0090.01712.25
5.3.200.0080.04112.44
5.3.190.0080.03312.26
5.3.180.0060.03812.41
5.3.170.0010.03612.49
5.3.160.0030.03712.49
5.3.150.0050.02412.46
5.3.140.0050.03812.50
5.3.130.0050.03712.50
5.3.120.0050.04012.42
5.3.110.0040.02512.46
5.3.100.0070.03412.15
5.3.90.0070.03512.20
5.3.80.0030.04212.28
5.3.70.0030.04112.16
5.3.60.0070.03312.17
5.3.50.0130.03312.05
5.3.40.0060.03712.11
5.3.30.0080.03111.92
5.3.20.0050.03811.92
5.3.10.0020.02211.88
5.3.00.0080.03611.85
5.2.170.0070.06011.13
5.2.160.0030.05711.13
5.2.150.0130.05011.13
5.2.140.0070.06011.13
5.2.130.0100.05311.13
5.2.120.0030.03011.19
5.2.110.0000.04011.13
5.2.100.0030.06311.13
5.2.90.0070.03311.22
5.2.80.0070.06011.23
5.2.70.0030.06011.19
5.2.60.0100.03311.13
5.2.50.0030.06311.13
5.2.40.0070.06011.13
5.2.30.0130.05011.13
5.2.20.0070.05711.13
5.2.10.0130.05011.13
5.2.00.0070.06011.13
5.1.60.0030.05311.13
5.1.50.0030.05311.13
5.1.40.0000.05011.13
5.1.30.0030.06011.13
5.1.20.0030.05011.13
5.1.10.0030.05711.13
5.1.00.0030.04311.13
5.0.50.0100.04011.13
5.0.40.0100.03711.13
5.0.30.0030.04011.13
5.0.20.0070.04311.13
5.0.10.0100.03711.13
5.0.00.0030.06011.13
4.4.90.0000.03711.13
4.4.80.0030.03311.13
4.4.70.0000.03311.13
4.4.60.0000.02011.13
4.4.50.0030.03711.13
4.4.40.0030.05311.13
4.4.30.0030.03311.13
4.4.20.0030.03311.13
4.4.10.0000.03311.13
4.4.00.0000.05311.13
4.3.110.0000.03711.13
4.3.100.0000.03011.13
4.3.90.0070.03011.13
4.3.80.0000.05011.13
4.3.70.0030.03311.13
4.3.60.0000.03711.13
4.3.50.0030.03011.13
4.3.40.0030.05011.13
4.3.30.0100.01311.13
4.3.20.0030.01711.13
4.3.10.0070.02711.13
4.3.00.0030.03311.13

preferences:
45.63 ms | 401 KiB | 5 Q