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; } $letters = 'abcd'; echo '2 letters from 4:<br>'; for($i = 0; $i < getPermCount($letters, 2); $i++) echo getPerm($letters, 2, $i).' '; echo '<br>3 letters from 4:<br>'; for($i = 0; $i < getPermCount($letters, 3); $i++) echo getPerm($letters, 3, $i). " ";

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)
8.3.60.0140.00018.31
8.3.50.0230.00622.05
8.3.40.0110.00418.76
8.3.30.0030.01020.34
8.3.20.0060.00318.90
8.3.10.0040.00421.09
8.3.00.0120.00319.68
8.2.180.0110.00716.75
8.2.170.0110.00422.96
8.2.160.0100.00320.43
8.2.150.0080.00024.18
8.2.140.0030.00624.66
8.2.130.0040.00426.16
8.2.120.0050.00319.89
8.2.110.0030.00622.27
8.2.100.0000.01217.84
8.2.90.0000.00819.17
8.2.80.0000.00819.39
8.2.70.0090.00017.75
8.2.60.0040.00417.80
8.2.50.0070.00318.07
8.2.40.0000.00819.88
8.2.30.0050.00221.28
8.2.20.0000.00817.73
8.2.10.0040.00417.76
8.2.00.0130.00017.64
8.1.280.0120.00325.92
8.1.270.0030.00624.66
8.1.260.0040.00426.35
8.1.250.0000.00828.09
8.1.240.0060.00620.77
8.1.230.0070.00420.91
8.1.220.0030.00518.77
8.1.210.0080.00018.90
8.1.200.0040.00417.23
8.1.190.0070.00017.53
8.1.180.0030.00618.10
8.1.170.0030.00618.55
8.1.160.0000.00718.76
8.1.150.0000.00918.67
8.1.140.0000.00817.49
8.1.130.0000.00817.83
8.1.120.0080.00017.31
8.1.110.0040.00417.36
8.1.100.0030.00417.47
8.1.90.0000.00717.48
8.1.80.0040.00417.52
8.1.70.0040.00417.36
8.1.60.0000.00717.63
8.1.50.0050.00317.53
8.1.40.0040.00417.43
8.1.30.0060.00317.59
8.1.20.0080.00017.65
8.1.10.0040.00417.45
8.1.00.0060.00617.52
8.0.300.0020.00519.98
8.0.290.0030.00617.05
8.0.280.0000.00718.45
8.0.270.0000.00717.21
8.0.260.0000.00616.84
8.0.250.0080.00017.00
8.0.240.0000.00716.98
8.0.230.0000.00716.90
8.0.220.0000.00716.87
8.0.210.0030.00316.79
8.0.200.0030.00316.98
8.0.190.0070.00016.98
8.0.180.0030.00616.92
8.0.170.0000.00716.77
8.0.160.0000.00716.98
8.0.150.0040.00416.95
8.0.140.0000.00716.89
8.0.130.0030.00313.40
8.0.120.0030.00616.83
8.0.110.0040.00416.68
8.0.100.0000.00716.95
8.0.90.0070.00016.92
8.0.80.0060.00916.87
8.0.70.0080.00016.79
8.0.60.0080.00016.86
8.0.50.0000.00716.79
8.0.30.0140.00517.14
8.0.20.0140.00817.40
8.0.10.0040.00416.90
8.0.00.0110.00716.81
7.4.330.0050.00016.66
7.4.320.0030.00316.54
7.4.300.0040.00416.45
7.4.290.0030.00316.54
7.4.280.0030.00316.53
7.4.270.0020.00516.51
7.4.260.0030.00313.36
7.4.250.0000.00816.58
7.4.240.0030.00316.59
7.4.230.0030.00316.52
7.4.220.0070.01116.64
7.4.210.0100.00716.59
7.4.200.0040.00416.45
7.4.190.0030.00516.75
7.4.160.0150.00016.52
7.4.150.0090.00917.40
7.4.140.0140.00517.86
7.4.130.0060.01116.55
7.4.120.0140.00416.57
7.4.110.0160.00516.70
7.4.100.0170.00716.56
7.4.90.0070.01016.48
7.4.80.0140.00819.39
7.4.70.0060.01016.45
7.4.60.0200.00016.62
7.4.50.0060.00316.47
7.4.40.0070.00722.77
7.4.30.0100.01416.66
7.4.00.0070.00815.05
7.3.330.0000.00513.30
7.3.320.0030.00513.24
7.3.310.0000.00816.33
7.3.300.0030.00316.23
7.3.290.0100.00516.39
7.3.280.0060.01016.37
7.3.270.0070.01017.40
7.3.260.0130.00618.24
7.3.250.0130.00716.55
7.3.240.0110.00716.71
7.3.230.0080.00816.39
7.3.210.0090.00916.39
7.3.200.0060.01319.39
7.3.190.0130.01016.44
7.3.180.0060.01516.50
7.3.170.0090.01216.64
7.3.160.0030.01516.50
7.3.120.0100.00714.71
7.3.110.0090.00914.79
7.3.100.0040.01214.47
7.3.90.0120.00314.88
7.3.80.0000.01514.54
7.3.70.0060.00914.95
7.3.60.0060.00914.91
7.3.50.0040.00714.87
7.3.40.0070.01014.65
7.3.30.0070.00714.78
7.3.20.0100.00316.80
7.3.10.0070.00716.53
7.3.00.0120.00216.59
7.2.330.0070.01016.83
7.2.320.0130.00616.53
7.2.310.0130.00616.68
7.2.300.0090.00916.72
7.2.290.0090.00916.77
7.2.250.0160.00315.32
7.2.240.0100.01015.25
7.2.230.0100.00715.02
7.2.220.0100.01015.03
7.2.210.0070.01115.34
7.2.200.0030.00915.11
7.2.190.0000.01315.02
7.2.180.0060.00915.30
7.2.170.0040.00814.98
7.2.130.0140.00016.95
7.2.120.0030.00616.97
7.2.110.0070.00716.75
7.2.100.0060.00316.74
7.2.90.0060.00617.04
7.2.80.0040.00716.88
7.2.70.0000.00917.01
7.2.60.0000.01417.05
7.2.50.0060.00316.91
7.2.40.0120.00316.81
7.2.30.0060.00916.95
7.2.20.0100.00716.96
7.2.10.0040.00416.95
7.2.00.0030.00716.86
7.1.330.0040.01115.51
7.1.320.0100.00315.66
7.1.310.0000.01315.79
7.1.300.0040.00415.84
7.1.290.0030.00715.77
7.1.280.0120.00315.63
7.1.270.0000.01415.84
7.1.260.0070.00715.98
7.1.250.0070.01015.84
7.1.70.0040.00417.26
7.1.60.0030.00717.19
7.1.50.0070.00316.74
7.1.40.0000.01416.77
7.1.30.0060.00916.74
7.1.20.0120.01216.74
7.1.10.0000.01416.74
7.1.00.0000.00816.90
7.0.200.0000.00716.77
7.0.190.0040.00416.74
7.0.180.0070.00716.74
7.0.170.0000.00816.74
7.0.160.0060.00616.74
7.0.150.0060.00616.74
7.0.140.0040.00416.74
7.0.130.0040.00416.74
7.0.120.0000.00816.74
7.0.110.0030.00616.74
7.0.100.0030.00516.74
7.0.90.0000.00716.74
7.0.80.0030.00616.74
7.0.70.0040.00716.74
7.0.60.0050.00316.74
7.0.50.0030.00516.74
7.0.40.0060.00316.74
7.0.30.0040.00416.74
7.0.20.0000.00816.74
7.0.10.0040.00416.74
7.0.00.0000.01016.74
5.6.300.0000.07020.80
5.6.290.0070.04020.80
5.6.280.0030.04420.84
5.6.270.0000.04420.88
5.6.260.0060.03820.88
5.6.250.0030.04720.82
5.6.240.0100.03521.05
5.6.230.0100.05420.88
5.6.220.0070.04321.05
5.6.210.0130.04320.96
5.6.200.0060.04421.05
5.6.190.0030.04121.03
5.6.180.0140.03420.88
5.6.170.0030.03920.96
5.6.160.0030.04320.86
5.6.150.0070.04320.78
5.6.140.0030.04420.95
5.6.130.0000.05220.82
5.6.120.0070.03720.86
5.6.110.0000.05120.82
5.6.100.0030.04220.82
5.6.90.0140.04120.85
5.6.80.0130.04520.25
5.6.70.0030.03920.43
5.6.60.0000.04320.30
5.6.50.0030.04220.33
5.6.40.0060.04220.36
5.6.30.0030.04220.41
5.6.20.0100.04020.35
5.6.10.0000.04420.29
5.6.00.0100.03520.17
5.5.380.0060.04117.56
5.5.370.0100.03117.48
5.5.360.0000.04417.40
5.5.350.0030.04017.41
5.5.340.0030.04817.86
5.5.330.0040.03918.07
5.5.320.0000.04618.09
5.5.310.0000.04318.04
5.5.300.0030.04318.12
5.5.290.0130.03218.08
5.5.280.0070.04017.85
5.5.270.0070.03817.95
5.5.260.0000.05118.17
5.5.250.0000.05117.95
5.5.240.0070.04017.56
5.5.230.0030.04217.46
5.5.220.0000.04517.39
5.5.210.0030.03817.51
5.5.200.0000.03917.21
5.5.190.0030.04117.41
5.5.180.0030.04217.45
5.5.160.0060.04217.05
5.5.150.0000.04517.05
5.5.140.0030.04217.07
5.5.130.0070.04417.48
5.5.120.0060.03517.21
5.5.110.0070.04017.20
5.5.100.0030.05017.09
5.5.90.0070.03617.09
5.5.80.0030.04017.37
5.5.70.0030.03817.33
5.5.60.0000.04217.28
5.5.50.0160.03616.95
5.5.40.0070.03716.93
5.5.30.0000.04717.32
5.5.20.0070.04017.36
5.5.10.0030.03816.98
5.5.00.0000.04817.07
5.4.450.0030.03919.44
5.4.440.0030.05119.56
5.4.430.0000.04319.40
5.4.420.0000.04919.27
5.4.410.0060.03519.41
5.4.400.0030.03619.08
5.4.390.0030.03919.13
5.4.380.0100.03519.07
5.4.370.0000.04219.21
5.4.360.0090.03119.21
5.4.350.0040.03919.08
5.4.340.0060.03519.16
5.4.320.0070.03419.07
5.4.310.0060.03719.08
5.4.300.0000.04619.24
5.4.290.0040.03919.13
5.4.280.0000.04119.07
5.4.270.0000.04318.89
5.4.260.0000.05419.07
5.4.250.0030.04119.23
5.4.240.0060.03518.98
5.4.230.0030.04019.09
5.4.220.0030.03819.11
5.4.210.0060.03219.20
5.4.200.0000.04519.00
5.4.190.0070.03619.21
5.4.180.0070.03319.06
5.4.170.0000.04318.96
5.4.160.0030.04119.07
5.4.150.0000.04318.93
5.4.140.0030.04116.74
5.4.130.0070.03316.82
5.4.120.0030.03316.84
5.4.110.0000.04016.74
5.4.100.0030.03816.74
5.4.90.0000.04016.74
5.4.80.0030.03716.74
5.4.70.0070.07416.74
5.4.60.0070.03116.74
5.4.50.0030.05316.74
5.4.40.0000.03816.84
5.4.30.0030.03716.74
5.4.20.0070.03216.74
5.4.10.0030.04216.74
5.4.00.0030.03716.74
5.3.290.0030.04116.74
5.3.280.0030.03916.74
5.3.270.0000.05316.74
5.3.260.0100.03516.74
5.3.250.0070.03316.74
5.3.240.0190.03516.74
5.3.230.0040.03616.74
5.3.220.0030.03416.74
5.3.210.0000.04616.74
5.3.200.0070.04616.74
5.3.190.0030.04016.74
5.3.180.0030.03516.74
5.3.170.0130.02916.74
5.3.160.0000.04416.74
5.3.150.0110.02816.74
5.3.140.0000.04116.74
5.3.130.0000.04116.74
5.3.120.0030.04116.74
5.3.110.0000.04416.74
5.3.100.0000.04516.74
5.3.90.0070.03416.74
5.3.80.0000.03816.74
5.3.70.0070.03116.74
5.3.60.0000.03716.74
5.3.50.0070.03016.74
5.3.40.0030.03716.74
5.3.30.0030.03616.74
5.3.20.0000.07916.74
5.3.10.0030.08716.74
5.3.00.0070.03416.74
5.2.170.0000.03116.74
5.2.160.0000.03016.74
5.2.150.0030.05716.74
5.2.140.0000.03416.74
5.2.130.0070.03816.74
5.2.120.0030.02816.74
5.2.110.0000.03416.74
5.2.100.0030.02916.74
5.2.90.0000.03116.74
5.2.80.0000.03016.74
5.2.70.0000.03216.74
5.2.60.0000.03116.74
5.2.50.0030.03216.74
5.2.40.0030.02816.74
5.2.30.0040.02816.74
5.2.20.0060.02616.74
5.2.10.0100.02316.74
5.2.00.0070.02416.74
5.1.60.0000.03216.74
5.1.50.0030.02916.74
5.1.40.0000.02516.74
5.1.30.0000.02816.74
5.1.20.0030.02516.74
5.1.10.0000.03116.74
5.1.00.0040.02516.74
5.0.50.0060.01916.74
5.0.40.0030.02016.74
5.0.30.0060.03216.74
5.0.20.0060.01516.74
5.0.10.0030.02116.74
5.0.00.0000.03416.74
4.4.90.0000.01716.74
4.4.80.0030.01316.74
4.4.70.0000.01716.74
4.4.60.0000.01716.74
4.4.50.0040.01416.74
4.4.40.0000.02616.74
4.4.30.0030.01416.74
4.4.20.0000.01616.74
4.4.10.0070.02416.74
4.4.00.0000.02616.74
4.3.110.0000.01816.74
4.3.100.0030.01316.74
4.3.90.0000.02016.74
4.3.80.0000.02616.74
4.3.70.0000.02016.74
4.3.60.0000.01816.74
4.3.50.0070.01016.74
4.3.40.0000.05216.74
4.3.30.0000.01716.74
4.3.20.0000.01916.74
4.3.10.0000.01716.74
4.3.00.0000.01716.74

preferences:
48.58 ms | 401 KiB | 5 Q