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 = 'x1 x2 x3'; $r = array(); //echo '1 letters from 4: '; for($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, $i); print_r($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)
8.3.70.0120.00616.63
8.3.60.0130.00318.54
8.3.50.0100.01021.33
8.3.40.0070.00718.83
8.3.30.0120.00320.35
8.3.20.0070.00318.77
8.3.10.0080.00021.17
8.3.00.0050.00319.81
8.2.180.0090.00916.75
8.2.170.0090.00622.96
8.2.160.0030.01020.35
8.2.150.0030.00524.18
8.2.140.0040.00424.66
8.2.130.0000.00926.16
8.2.120.0040.00419.95
8.2.110.0060.00322.16
8.2.100.0080.00417.84
8.2.90.0050.00319.23
8.2.80.0040.00419.25
8.2.70.0040.00417.50
8.2.60.0060.00317.93
8.2.50.0060.00318.07
8.2.40.0000.00920.00
8.2.30.0040.00419.41
8.2.20.0040.00417.79
8.2.10.0080.00017.77
8.2.00.0000.00817.79
8.1.280.0000.01425.92
8.1.270.0050.00223.99
8.1.260.0080.00026.35
8.1.250.0050.00328.09
8.1.240.0090.00320.62
8.1.230.0070.00420.88
8.1.220.0030.00618.77
8.1.210.0040.00418.89
8.1.200.0090.00017.23
8.1.190.0040.00417.66
8.1.180.0000.00818.10
8.1.170.0050.00318.65
8.1.160.0000.00718.91
8.1.150.0020.00518.73
8.1.140.0040.00417.49
8.1.130.0050.00317.79
8.1.120.0070.00017.46
8.1.110.0040.00417.36
8.1.100.0040.00417.36
8.1.90.0030.00517.49
8.1.80.0080.00017.50
8.1.70.0000.00717.50
8.1.60.0060.00317.53
8.1.50.0050.00317.55
8.1.40.0000.00917.42
8.1.30.0040.00417.61
8.1.20.0050.00317.55
8.1.10.0060.00317.45
8.1.00.0070.00317.50
8.0.300.0090.00020.03
8.0.290.0040.00417.18
8.0.280.0050.00218.34
8.0.270.0070.00017.22
8.0.260.0000.00716.76
8.0.250.0040.00416.98
8.0.240.0000.00816.86
8.0.230.0000.00816.86
8.0.220.0040.00416.96
8.0.210.0000.00716.93
8.0.200.0000.00716.96
8.0.190.0030.00617.02
8.0.180.0050.00316.92
8.0.170.0040.00416.88
8.0.160.0040.00416.82
8.0.150.0000.00716.93
8.0.140.0000.00716.91
8.0.130.0030.00313.32
8.0.120.0030.00616.91
8.0.110.0050.00316.87
8.0.100.0000.00717.03
8.0.90.0000.00716.92
8.0.80.0000.01716.84
8.0.70.0040.00416.89
8.0.60.0000.00716.91
8.0.50.0030.00516.82
8.0.30.0100.00817.03
8.0.20.0160.00717.40
8.0.10.0000.00817.08
8.0.00.0160.00516.80
7.4.330.0000.00516.62
7.4.320.0060.00016.65
7.4.300.0030.00316.47
7.4.290.0000.00716.48
7.4.280.0070.00016.43
7.4.270.0000.00816.56
7.4.260.0000.00513.37
7.4.250.0040.00416.54
7.4.240.0040.00416.60
7.4.230.0080.00016.41
7.4.220.0100.01016.55
7.4.210.0070.00816.64
7.4.200.0040.00416.65
7.4.190.0040.00416.79
7.4.160.0130.01016.60
7.4.150.0110.01017.40
7.4.140.0110.01117.86
7.4.130.0060.01216.45
7.4.120.0110.00816.52
7.4.110.0140.01116.53
7.4.100.0040.01316.50
7.4.90.0130.00916.45
7.4.80.0070.01019.39
7.4.70.0150.00916.52
7.4.60.0140.00416.48
7.4.50.0030.00616.44
7.4.40.0030.01322.77
7.4.30.0060.01016.57
7.4.00.0100.00715.19
7.3.330.0000.00513.26
7.3.320.0030.00313.20
7.3.310.0080.00016.42
7.3.300.0030.00316.35
7.3.290.0060.01016.31
7.3.280.0080.01116.40
7.3.270.0120.00617.40
7.3.260.0120.00818.24
7.3.250.0080.01016.40
7.3.240.0140.00316.69
7.3.230.0140.00716.46
7.3.210.0120.00816.71
7.3.200.0040.01919.39
7.3.190.0140.00416.30
7.3.180.0060.01216.48
7.3.170.0090.00816.47
7.3.160.0060.01216.48
7.3.120.0100.00715.02
7.3.110.0020.01314.99
7.3.100.0080.00814.87
7.3.90.0100.00514.91
7.3.80.0120.00514.81
7.3.70.0060.00914.85
7.3.60.0090.00614.80
7.3.50.0050.01014.87
7.3.40.0030.01214.70
7.3.30.0080.00614.74
7.3.20.0050.00916.67
7.3.10.0060.00716.73
7.3.00.0080.00816.64
7.2.330.0090.00916.56
7.2.320.0070.01116.72
7.2.310.0140.01116.73
7.2.300.0040.01416.43
7.2.290.0000.01716.55
7.2.250.0030.01415.27
7.2.240.0050.01115.26
7.2.230.0070.00415.06
7.2.220.0050.01115.18
7.2.210.0110.00514.87
7.2.200.0110.00514.89
7.2.190.0110.00615.09
7.2.180.0060.00815.18
7.2.170.0070.00915.03
7.2.160.0100.00715.13
7.2.150.0070.01117.03
7.2.140.0180.00017.02
7.2.130.0020.01217.03
7.2.120.0110.00417.04
7.2.110.0050.00716.90
7.2.100.0090.00616.91
7.2.90.0060.00716.92
7.2.80.0080.00716.88
7.2.70.0030.00917.01
7.2.60.0030.01116.93
7.2.50.0050.00916.92
7.2.40.0040.00916.96
7.2.30.0050.01017.12
7.2.20.0030.01116.82
7.2.10.0070.00716.80
7.2.00.0080.00617.57
7.1.330.0040.01115.78
7.1.320.0080.00715.70
7.1.310.0040.01115.88
7.1.300.0020.01215.80
7.1.290.0080.00615.88
7.1.280.0090.00515.73
7.1.270.0030.01015.77
7.1.260.0080.00615.88
7.1.250.0090.00515.76
7.1.240.0040.00415.95
7.1.230.0000.01415.66
7.1.220.0030.01015.79
7.1.210.0090.00915.89
7.1.200.0030.01015.64
7.1.190.0030.00715.86
7.1.180.0090.00315.59
7.1.170.0040.01115.77
7.1.160.0040.01115.72
7.1.150.0100.00315.77
7.1.140.0070.01115.50
7.1.130.0090.00615.55
7.1.120.0070.01115.85
7.1.110.0060.01215.90
7.1.100.0070.00517.12
7.1.90.0080.00815.62
7.1.80.0030.00715.73
7.1.70.0010.01016.39
7.1.60.0080.01317.45
7.1.50.0170.00625.23
7.1.40.0000.01115.77
7.1.30.0070.00715.75
7.1.20.0120.00315.59
7.1.10.0080.00815.61
7.1.00.0030.02119.12
7.0.330.0060.01215.45
7.0.320.0070.01415.13
7.0.310.0200.00015.36
7.0.300.0110.00315.18
7.0.290.0030.01015.50
7.0.280.0040.01115.40
7.0.270.0140.00415.41
7.0.260.0060.01215.57
7.0.250.0140.00715.50
7.0.240.0070.01415.57
7.0.230.0030.01515.40
7.0.220.0100.00315.53
7.0.210.0070.00715.35
7.0.200.0110.00316.11
7.0.190.0060.01315.66
7.0.180.0070.01015.39
7.0.170.0100.00715.45
7.0.160.0100.00715.42
7.0.150.0180.00415.28
7.0.140.0080.04118.66
7.0.130.0070.01015.38
7.0.120.0040.01115.39
7.0.110.0060.01315.47
7.0.100.0250.02717.73
7.0.90.0050.04917.63
7.0.80.0170.03517.46
7.0.70.0100.04617.54
7.0.60.0290.03817.53
7.0.50.0080.03517.90
7.0.40.0100.03716.79
7.0.30.0110.03216.64
7.0.20.0030.04216.81
7.0.10.0090.02916.73
7.0.00.0140.04216.76
5.6.380.0070.01414.13
5.6.370.0110.00714.11
5.6.360.0090.01314.70
5.6.350.0120.00914.49
5.6.340.0040.01814.60
5.6.330.0000.02214.24
5.6.320.0040.01814.93
5.6.310.0070.01314.45
5.6.300.0100.01314.49
5.6.290.0070.01014.41
5.6.280.0060.04617.50
5.6.270.0060.01314.56
5.6.260.0040.01414.78
5.6.250.0080.04717.52
5.6.240.0050.05317.30
5.6.230.0150.02217.71
5.6.220.0100.03517.58
5.6.210.0030.05517.61
5.6.200.0100.04917.71
5.6.190.0120.02717.60
5.6.180.0130.04017.61
5.6.170.0100.03617.68
5.6.160.0100.03917.77
5.6.150.0110.04517.73
5.6.140.0130.03017.58
5.6.130.0110.03217.68
5.6.120.0100.03017.74
5.6.110.0130.04317.82
5.6.100.0050.03517.78
5.6.90.0060.02917.66
5.6.80.0100.03617.31
5.6.70.0110.03217.52
5.6.60.0110.04417.22
5.6.50.0070.04217.52
5.6.40.0080.02617.49
5.6.30.0120.03717.34
5.6.20.0070.04217.51
5.6.10.0100.04417.44
5.6.00.0060.03817.32
5.5.380.0200.02015.88
5.5.370.0070.04616.02
5.5.360.0050.03515.90
5.5.350.0090.03315.98
5.5.340.0070.02616.07
5.5.330.0070.04716.01
5.5.320.0060.04616.05
5.5.310.0070.03016.10
5.5.300.0100.04115.85
5.5.290.0120.03215.95
5.5.280.0140.03716.08
5.5.270.0030.03715.95
5.5.260.0050.03415.97
5.5.250.0050.04915.76
5.5.240.0050.02515.52
5.5.230.0090.03815.62
5.5.220.0040.02515.52
5.5.210.0100.03915.61
5.5.200.0020.03315.47
5.5.190.0050.02515.78
5.5.180.0130.04215.81
5.5.170.0070.01011.06
5.5.160.0100.03015.64
5.5.150.0080.04015.68
5.5.140.0070.02215.60
5.5.130.0050.04115.74
5.5.120.0050.03215.83
5.5.110.0080.04515.70
5.5.100.0130.04315.73
5.5.90.0050.04215.73
5.5.80.0030.03015.61
5.5.70.0060.03315.60
5.5.60.0100.02715.63
5.5.50.0120.03515.38
5.5.40.0100.04315.83
5.5.30.0070.03815.67
5.5.20.0070.04315.58
5.5.10.0060.03015.60
5.5.00.0050.02715.53
5.4.450.0060.04515.06
5.4.440.0130.03515.41
5.4.430.0030.04415.29
5.4.420.0050.02415.28
5.4.410.0050.02215.39
5.4.400.0080.04015.16
5.4.390.0070.04615.04
5.4.380.0120.02815.06
5.4.370.0080.04315.12
5.4.360.0090.04215.07
5.4.350.0090.02915.17
5.4.340.0080.04814.97
5.4.330.0030.00911.37
5.4.320.0070.02415.22
5.4.310.0030.02715.04
5.4.300.0100.02615.22
5.4.290.0090.02715.12
5.4.280.0080.02915.21
5.4.270.0100.02215.09
5.4.260.0120.02815.06
5.4.250.0050.03515.24
5.4.240.0070.02715.11
5.4.230.0110.03815.03
5.4.220.0130.04115.04
5.4.210.0090.03115.02
5.4.200.0100.03315.09
5.4.190.0050.02915.19
5.4.180.0090.02615.19
5.4.170.0070.04315.15
5.4.160.0080.04015.13
5.4.150.0080.04314.95
5.4.140.0100.02513.78
5.4.130.0080.04113.78
5.4.120.0120.03913.91
5.4.110.0050.03313.80
5.4.100.0050.03913.93
5.4.90.0100.04213.81
5.4.80.0130.02713.91
5.4.70.0050.02713.86
5.4.60.0020.04413.84
5.4.50.0070.02013.86
5.4.40.0080.02313.71
5.4.30.0050.02513.84
5.4.20.0070.02213.83
5.4.10.0050.02413.82
5.4.00.0030.02513.61
5.3.290.0050.02912.66
5.3.280.0100.04512.58
5.3.270.0050.02812.69
5.3.260.0070.03312.79
5.3.250.0070.03412.77
5.3.240.0070.04312.70
5.3.230.0070.03012.64
5.3.220.0100.03412.58
5.3.210.0070.02312.65
5.3.200.0080.03912.57
5.3.190.0070.03012.67
5.3.180.0070.02612.79
5.3.170.0070.03312.68
5.3.160.0070.02712.79
5.3.150.0090.02012.69
5.3.140.0070.02212.60
5.3.130.0100.02012.77
5.3.120.0040.02812.71
5.3.110.0120.02712.74
5.3.100.0050.02412.42
5.3.90.0090.01912.23
5.3.80.0050.02312.20
5.3.70.0020.02512.31
5.3.60.0080.02312.35
5.3.50.0050.02312.27
5.3.40.0100.01812.40
5.3.30.0050.01712.33
5.3.20.0080.01712.11
5.3.10.0050.01912.07
5.3.00.0070.02312.20
5.2.170.0070.01511.01
5.2.160.0070.02010.95
5.2.150.0060.01810.87
5.2.140.0030.02010.98
5.2.130.0030.02210.88
5.2.120.0080.01310.98
5.2.110.0050.02010.90
5.2.100.0020.02110.97
5.2.90.0050.02310.93
5.2.80.0050.02310.85
5.2.70.0080.02910.90
5.2.60.0060.02110.77
5.2.50.0120.01910.79
5.2.40.0060.02010.94
5.2.30.0060.01910.91
5.2.20.0030.02310.84
5.2.10.0050.01810.80
5.2.00.0030.01810.80
5.1.60.0030.02010.50
5.1.50.0080.01310.39
5.1.40.0090.01510.52
5.1.30.0040.01710.57
5.1.20.0100.01610.56
5.1.10.0120.01210.55
5.1.00.0050.01910.39
5.0.50.0050.01510.39
5.0.40.0020.02010.39
5.0.30.0090.02010.39
5.0.20.0060.01610.39
5.0.10.0070.01310.39
5.0.00.0050.02110.39
4.4.90.0030.01810.39
4.4.80.0060.01310.39
4.4.70.0020.01510.39
4.4.60.0010.01610.39
4.4.50.0010.01710.39
4.4.40.0020.02210.39
4.4.30.0060.01510.39
4.4.20.0030.01710.39
4.4.10.0030.01810.39
4.4.00.0030.02210.39
4.3.110.0050.01510.39
4.3.100.0050.01310.39
4.3.90.0040.01410.39
4.3.80.0030.01810.39
4.3.70.0050.01310.39
4.3.60.0050.01210.39
4.3.50.0070.01310.39
4.3.40.0050.01710.39
4.3.30.0070.01110.39
4.3.20.0020.01610.39
4.3.10.0030.01610.39
4.3.00.0020.01310.39

preferences:
72.26 ms | 401 KiB | 5 Q