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 $result; } $letters = 'abcd'; echo '2 letters from 4: '; for($i = 0; $i < getPermCount($letters, 2); $i++) echo getPerm($letters, 2, $i).' '; echo ' 3 letters from 4: '; $r = array(); for($i = 0; $i < getPermCount($letters, 3); $i++) $r[] = getPerm($letters, 3, $i); print_r($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)
8.3.60.0110.00718.30
8.3.50.0090.00922.05
8.3.40.0060.00918.80
8.3.30.0030.01020.17
8.3.20.0040.00418.77
8.3.10.0060.00321.21
8.3.00.0030.00619.80
8.2.180.0110.01116.50
8.2.170.0030.01022.96
8.2.160.0000.01420.22
8.2.150.0030.00524.18
8.2.140.0050.00324.66
8.2.130.0030.00626.16
8.2.120.0050.00219.96
8.2.110.0090.00319.19
8.2.100.0060.00617.72
8.2.90.0040.00419.22
8.2.80.0040.00419.43
8.2.70.0040.00417.59
8.2.60.0000.00817.80
8.2.50.0030.00618.07
8.2.40.0080.00018.14
8.2.30.0040.00421.27
8.2.20.0040.00417.82
8.2.10.0030.00517.78
8.2.00.0000.00817.69
8.1.280.0000.01525.92
8.1.270.0050.00323.99
8.1.260.0060.00326.35
8.1.250.0080.00028.09
8.1.240.0100.00022.50
8.1.230.0110.00020.93
8.1.220.0030.00618.77
8.1.210.0040.00818.84
8.1.200.0060.00517.25
8.1.190.0070.00017.54
8.1.180.0030.00518.10
8.1.170.0050.00318.55
8.1.160.0050.00318.91
8.1.150.0000.00818.73
8.1.140.0060.00317.43
8.1.130.0000.00717.77
8.1.120.0090.00017.45
8.1.110.0000.00817.43
8.1.100.0040.00417.53
8.1.90.0000.00817.41
8.1.80.0000.00817.38
8.1.70.0070.00017.42
8.1.60.0000.00817.47
8.1.50.0000.00717.43
8.1.40.0000.00817.53
8.1.30.0040.00417.64
8.1.20.0000.00917.73
8.1.10.0050.00317.47
8.1.00.0080.00017.55
8.0.300.0040.00419.79
8.0.290.0040.00417.18
8.0.280.0000.00818.52
8.0.270.0030.00317.29
8.0.260.0050.00216.73
8.0.250.0040.00417.00
8.0.240.0080.00316.86
8.0.230.0080.00017.05
8.0.220.0000.00716.88
8.0.210.0040.00416.82
8.0.200.0000.00616.87
8.0.190.0060.00316.98
8.0.180.0070.00016.93
8.0.170.0000.00716.93
8.0.160.0040.00416.86
8.0.150.0000.00716.87
8.0.140.0040.00316.90
8.0.130.0060.00013.38
8.0.120.0040.00416.94
8.0.110.0040.00316.81
8.0.100.0050.00316.92
8.0.90.0040.00416.91
8.0.80.0120.00916.88
8.0.70.0030.00516.98
8.0.60.0070.00016.81
8.0.50.0000.00716.94
8.0.30.0110.01016.98
8.0.20.0130.01017.40
8.0.10.0000.00717.04
8.0.00.0070.01016.72
7.4.330.0000.00516.79
7.4.320.0030.00316.63
7.4.300.0030.00316.54
7.4.290.0000.00716.64
7.4.280.0030.00316.55
7.4.270.0000.00716.56
7.4.260.0000.00513.26
7.4.250.0080.00016.49
7.4.240.0000.00816.64
7.4.230.0030.00316.64
7.4.220.0120.00616.69
7.4.210.0090.00716.59
7.4.200.0000.00716.73
7.4.190.0040.00416.71
7.4.160.0090.01516.50
7.4.150.0290.00617.40
7.4.140.0060.01117.86
7.4.130.0090.00816.54
7.4.120.0100.01316.47
7.4.110.0000.01816.76
7.4.100.0050.01116.51
7.4.90.0220.00416.50
7.4.80.0130.01319.39
7.4.70.0100.01316.41
7.4.60.0130.00316.48
7.4.50.0000.00816.25
7.4.40.0030.00622.77
7.4.30.0130.00716.47
7.4.00.0050.01214.93
7.3.330.0030.00313.38
7.3.320.0030.00313.42
7.3.310.0030.00316.48
7.3.300.0000.00716.35
7.3.290.0030.01216.41
7.3.280.0030.01316.40
7.3.270.0150.00917.40
7.3.260.0110.01018.24
7.3.250.0140.00516.38
7.3.240.0090.00916.63
7.3.230.0090.00616.55
7.3.210.0100.01316.48
7.3.200.0140.00619.39
7.3.190.0130.01016.45
7.3.180.0090.00616.40
7.3.170.0040.01116.56
7.3.160.0030.01316.45
7.3.120.0100.00814.91
7.3.110.0100.00715.05
7.3.100.0100.00615.15
7.3.90.0070.00414.84
7.3.80.0040.00715.20
7.3.70.0040.00714.80
7.3.60.0060.00314.94
7.3.50.0090.00614.79
7.3.40.0040.01114.75
7.3.30.0000.01614.55
7.3.20.0090.00316.48
7.3.10.0060.00816.35
7.3.00.0070.00816.42
7.2.330.0100.01016.79
7.2.320.0040.01316.60
7.2.310.0120.00716.76
7.2.300.0100.00716.77
7.2.290.0060.01016.54
7.2.250.0060.01014.69
7.2.240.0030.01314.96
7.2.230.0120.00314.93
7.2.220.0070.00715.21
7.2.210.0090.00614.86
7.2.200.0040.01115.03
7.2.190.0030.01015.01
7.2.180.0070.00715.16
7.2.170.0040.01115.22
7.2.130.0060.00916.77
7.2.120.0050.00916.80
7.2.110.0100.00616.73
7.2.100.0080.00716.73
7.2.90.0110.00616.64
7.2.80.0100.00716.88
7.2.70.0060.01116.76
7.2.60.0080.01016.71
7.2.50.0090.01016.52
7.2.40.0060.00916.90
7.2.30.0080.00816.84
7.2.20.0110.00816.68
7.2.10.0130.00416.76
7.2.00.0080.00817.45
7.1.330.0040.01115.89
7.1.320.0120.00015.54
7.1.310.0060.00316.04
7.1.300.0070.00415.70
7.1.290.0070.01015.89
7.1.280.0070.00715.86
7.1.270.0000.01115.46
7.1.260.0070.00716.00
7.1.250.0080.00915.59
7.1.240.0000.01715.77
7.1.230.0050.00815.71
7.1.220.0030.01015.77
7.1.210.0040.01415.85
7.1.200.0070.00715.85
7.1.190.0090.00915.64
7.1.180.0140.00015.79
7.1.170.0100.00715.71
7.1.160.0000.01515.61
7.1.150.0150.00315.71
7.1.140.0040.00815.72
7.1.130.0130.00615.81
7.1.120.0110.00415.70
7.1.110.0040.01215.72
7.1.100.0020.01016.87
7.1.90.0030.00715.91
7.1.80.0030.01015.79
7.1.70.0050.00616.40
7.1.60.0080.00917.42
7.1.50.0120.00916.39
7.1.40.0130.00015.86
7.1.30.0120.00315.89
7.1.20.0070.01015.82
7.1.10.0030.00615.75
7.1.00.0050.02118.94
7.0.330.0110.00315.42
7.0.320.0040.00414.95
7.0.310.0080.00015.30
7.0.300.0070.01015.25
7.0.290.0060.00615.21
7.0.280.0000.00915.23
7.0.270.0060.00615.20
7.0.260.0000.01315.12
7.0.250.0100.00315.34
7.0.240.0030.01015.13
7.0.230.0060.00915.32
7.0.220.0070.00715.15
7.0.210.0060.00915.26
7.0.200.0030.01015.94
7.0.190.0030.00915.35
7.0.180.0120.00015.39
7.0.170.0030.01215.17
7.0.160.0060.00915.04
7.0.150.0070.01015.39
7.0.140.0060.04118.76
7.0.130.0030.01015.40
7.0.120.0030.01015.40
7.0.110.0090.00415.16
7.0.100.0050.04317.46
7.0.90.0060.04617.67
7.0.80.0130.04017.48
7.0.70.0180.04017.66
7.0.60.0220.04817.67
7.0.50.0050.02817.89
7.0.40.0050.03616.63
7.0.30.0080.02316.74
7.0.20.0070.04416.74
7.0.10.0070.04416.57
7.0.00.0050.04716.70
5.6.380.0110.00714.39
5.6.370.0180.00914.13
5.6.360.0200.00314.53
5.6.350.0140.00714.39
5.6.340.0070.01014.27
5.6.330.0100.00514.57
5.6.320.0070.01013.75
5.6.310.0070.00714.52
5.6.300.0070.00714.26
5.6.290.0080.00413.90
5.6.280.0000.04317.91
5.6.270.0000.01114.44
5.6.260.0030.01014.28
5.6.250.0080.04617.61
5.6.240.0070.04717.49
5.6.230.0100.04017.52
5.6.220.0080.04217.44
5.6.210.0060.03017.48
5.6.200.0070.02317.53
5.6.190.0050.04217.72
5.6.180.0080.05217.52
5.6.170.0060.02417.64
5.6.160.0020.04617.71
5.6.150.0090.04317.82
5.6.140.0070.04817.70
5.6.130.0120.01917.56
5.6.120.0110.03417.57
5.6.110.0080.04417.73
5.6.100.0070.03617.63
5.6.90.0050.03417.71
5.6.80.0070.04517.40
5.6.70.0070.04317.28
5.6.60.0110.02717.43
5.6.50.0070.03217.51
5.6.40.0100.02517.30
5.6.30.0080.05017.39
5.6.20.0070.03017.27
5.6.10.0050.03817.27
5.6.00.0050.03017.20
5.5.380.0080.03815.78
5.5.370.0050.04015.79
5.5.360.0100.03015.96
5.5.350.0080.04315.71
5.5.340.0070.04216.01
5.5.330.0030.04615.98
5.5.320.0070.04116.10
5.5.310.0090.04115.95
5.5.300.0120.04215.94
5.5.290.0110.04016.02
5.5.280.0070.03215.92
5.5.270.0030.04816.21
5.5.260.0100.04015.97
5.5.250.0030.04015.98
5.5.240.0050.03515.51
5.5.230.0070.03015.54
5.5.220.0100.03015.61
5.5.210.0070.02315.77
5.5.200.0070.03215.70
5.5.190.0090.04215.75
5.5.180.0030.04015.47
5.5.170.0070.00411.29
5.5.160.0150.01315.55
5.5.150.0070.03315.66
5.5.140.0070.04815.84
5.5.130.0100.04215.76
5.5.120.0120.03515.80
5.5.110.0050.02415.51
5.5.100.0050.02715.69
5.5.90.0080.03315.64
5.5.80.0050.04415.53
5.5.70.0050.03915.55
5.5.60.0080.02315.55
5.5.50.0050.04015.72
5.5.40.0050.04215.52
5.5.30.0080.02315.67
5.5.20.0130.02615.43
5.5.10.0080.03315.68
5.5.00.0130.01915.55
5.4.450.0040.03415.26
5.4.440.0040.04515.24
5.4.430.0070.03715.20
5.4.420.0060.04315.24
5.4.410.0080.03215.16
5.4.400.0070.03014.92
5.4.390.0050.03715.11
5.4.380.0030.04015.02
5.4.370.0050.04215.01
5.4.360.0080.04814.91
5.4.350.0070.04215.15
5.4.340.0050.04515.03
5.4.330.0000.00611.18
5.4.320.0070.04015.22
5.4.310.0040.02314.91
5.4.300.0030.04415.05
5.4.290.0030.04315.02
5.4.280.0070.03815.17
5.4.270.0070.04015.22
5.4.260.0030.02515.09
5.4.250.0110.03615.07
5.4.240.0050.03515.11
5.4.230.0080.04115.13
5.4.220.0050.03515.05
5.4.210.0080.03814.95
5.4.200.0030.02814.99
5.4.190.0100.03015.16
5.4.180.0130.02815.10
5.4.170.0110.02314.85
5.4.160.0040.02614.95
5.4.150.0070.03315.01
5.4.140.0020.02713.78
5.4.130.0130.03413.75
5.4.120.0040.02913.83
5.4.110.0030.04113.84
5.4.100.0020.03113.72
5.4.90.0100.03613.71
5.4.80.0020.04113.58
5.4.70.0120.03513.77
5.4.60.0040.03813.73
5.4.50.0060.02313.80
5.4.40.0010.03513.77
5.4.30.0090.03113.76
5.4.20.0080.02013.73
5.4.10.0060.02013.63
5.4.00.0050.04113.47
5.3.290.0030.03312.58
5.3.280.0060.02212.56
5.3.270.0130.02212.54
5.3.260.0050.03812.67
5.3.250.0080.04012.66
5.3.240.0030.03612.60
5.3.230.0070.04012.59
5.3.220.0070.03312.57
5.3.210.0030.02512.57
5.3.200.0030.03012.55
5.3.190.0050.02512.61
5.3.180.0060.04112.71
5.3.170.0030.04012.55
5.3.160.0050.03812.52
5.3.150.0050.04012.73
5.3.140.0020.03012.70
5.3.130.0030.04312.61
5.3.120.0030.03612.63
5.3.110.0050.03612.52
5.3.100.0060.04112.34
5.3.90.0090.03912.36
5.3.80.0050.04112.36
5.3.70.0050.04012.13
5.3.60.0020.02712.29
5.3.50.0070.03012.21
5.3.40.0110.02712.24
5.3.30.0020.02312.09
5.3.20.0000.03912.16
5.3.10.0070.02012.04
5.3.00.0000.04112.07
5.2.170.0010.03110.34
5.2.160.0030.03310.40
5.2.150.0030.03510.32
5.2.140.0070.02310.38
5.2.130.0050.02610.30
5.2.120.0000.02410.27
5.2.110.0070.01410.22
5.2.100.0040.01710.39
5.2.90.0030.02010.26
5.2.80.0030.01710.31
5.2.70.0060.01510.32
5.2.60.0030.02010.27
5.2.50.0020.01810.27
5.2.40.0000.01810.31
5.2.30.0040.02010.25
5.2.20.0060.01510.25
5.2.10.0010.01910.21
5.2.00.0030.01610.12
5.1.60.0100.0089.74
5.1.50.0010.0139.71
5.1.40.0000.0159.71
5.1.30.0020.0159.95
5.1.20.0070.0089.94
5.1.10.0020.0179.78
5.1.00.0030.0139.74
5.0.50.0020.0129.71
5.0.40.0000.0129.71
5.0.30.0020.0169.71
5.0.20.0020.0109.71
5.0.10.0020.0159.71
5.0.00.0050.0179.71
4.4.90.0050.0169.71
4.4.80.0030.0119.71
4.4.70.0000.0109.71
4.4.60.0000.0139.71
4.4.50.0020.0129.71
4.4.40.0020.0129.71
4.4.30.0000.0129.71
4.4.20.0010.0109.71
4.4.10.0020.0089.71
4.4.00.0000.0129.71
4.3.110.0020.0089.71
4.3.100.0020.0089.71
4.3.90.0030.0089.71
4.3.80.0000.0149.71
4.3.70.0020.0099.71
4.3.60.0010.0109.71
4.3.50.0020.0089.71
4.3.40.0000.0179.71
4.3.30.0020.0119.71
4.3.20.0000.0119.71
4.3.10.0020.0089.71
4.3.00.0030.0069.71

preferences:
38.44 ms | 401 KiB | 5 Q