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; } echo "PermCount: " . $result; 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); $result = array_unique($result, SORT_REGULAR); return implode("", $result); } $r = array(); //$letters = 'abcdefghijklm'; $letters = 'abcd'; $len = strlen($letters); for ($c = 1; $c <= $len; $c++) { for($i = 0; $i < getPermCount($letters, $c); $i++) $r[] = getPerm($letters, $c, $i); } //print_r(array_unique($r, SORT_REGULAR)); $r = array_unique($r, SORT_REGULAR); print_r(count($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)
8.3.60.0150.00418.43
8.3.50.0130.00821.14
8.3.40.0040.01118.86
8.3.30.0030.01020.13
8.3.20.0000.00918.90
8.3.10.0030.00521.13
8.3.00.0000.00823.64
8.2.180.0130.00318.14
8.2.170.0080.00822.96
8.2.160.0030.01020.53
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0050.00326.16
8.2.120.0040.00419.95
8.2.110.0000.00919.24
8.2.100.0090.00317.72
8.2.90.0000.00919.25
8.2.80.0000.00719.16
8.2.70.0050.00517.38
8.2.60.0060.00318.03
8.2.50.0050.00318.07
8.2.40.0000.00818.07
8.2.30.0060.00319.53
8.2.20.0080.00017.67
8.2.10.0030.00517.66
8.2.00.0020.00517.68
8.1.280.0130.00625.92
8.1.270.0080.00023.99
8.1.260.0060.00326.35
8.1.250.0080.00028.09
8.1.240.0050.00522.58
8.1.230.0080.00320.95
8.1.220.0040.00418.77
8.1.210.0040.00418.98
8.1.200.0100.00017.22
8.1.190.0000.00817.39
8.1.180.0100.00018.10
8.1.170.0000.00818.64
8.1.160.0040.00418.90
8.1.150.0040.00418.66
8.1.140.0000.00717.54
8.1.130.0040.00417.86
8.1.120.0040.00417.35
8.1.110.0080.00017.39
8.1.100.0070.00017.49
8.1.90.0000.00817.54
8.1.80.0000.00817.48
8.1.70.0000.00717.47
8.1.60.0030.00517.63
8.1.50.0040.00417.52
8.1.40.0040.00417.54
8.1.30.0090.00017.67
8.1.20.0000.00817.70
8.1.10.0050.00217.57
8.1.00.0030.00617.61
8.0.300.0000.00819.88
8.0.290.0050.00317.16
8.0.280.0070.00018.39
8.0.270.0000.00717.29
8.0.260.0000.00616.86
8.0.250.0030.00516.98
8.0.240.0030.00616.88
8.0.230.0070.00016.88
8.0.220.0000.00716.80
8.0.210.0000.00716.81
8.0.200.0030.00316.98
8.0.190.0000.00716.96
8.0.180.0000.00716.86
8.0.170.0080.00016.93
8.0.160.0040.00416.88
8.0.150.0000.00816.85
8.0.140.0070.00416.88
8.0.130.0000.00513.36
8.0.120.0030.00616.85
8.0.110.0040.00416.81
8.0.100.0030.00616.94
8.0.90.0040.00416.81
8.0.80.0130.00616.88
8.0.70.0000.00716.80
8.0.60.0000.00716.79
8.0.50.0080.00016.94
8.0.30.0140.00817.21
8.0.20.0100.01017.40
8.0.10.0020.00517.05
8.0.00.0130.00516.99
7.4.330.0020.00216.85
7.4.320.0030.00316.69
7.4.300.0000.00716.45
7.4.290.0000.01016.45
7.4.280.0050.00216.44
7.4.270.0030.00316.55
7.4.260.0000.00513.24
7.4.250.0000.00816.48
7.4.240.0030.00316.67
7.4.230.0030.00516.52
7.4.220.0160.01016.52
7.4.210.0090.00816.62
7.4.200.0080.00016.36
7.4.190.0070.00016.71
7.4.160.0060.01216.70
7.4.150.0070.01117.40
7.4.140.0100.01317.86
7.4.130.0030.01616.50
7.4.120.0090.01016.48
7.4.110.0060.01216.76
7.4.100.0110.00716.52
7.4.90.0100.00916.66
7.4.80.0070.01119.39
7.4.70.0100.01016.68
7.4.60.0130.00716.59
7.4.50.0040.00416.62
7.4.40.0100.00322.77
7.4.30.0110.00616.25
7.4.10.0130.00716.35
7.4.00.0100.00815.48
7.3.330.0000.00513.43
7.3.320.0000.00513.21
7.3.310.0040.00416.25
7.3.300.0000.00816.25
7.3.290.0090.00616.39
7.3.280.0080.01216.38
7.3.270.0160.00317.40
7.3.260.0140.00618.24
7.3.250.0110.00716.42
7.3.240.0060.01216.49
7.3.230.0060.00916.48
7.3.210.0060.01216.68
7.3.200.0150.00919.39
7.3.190.0130.01016.44
7.3.180.0110.00616.70
7.3.170.0140.00316.47
7.3.160.0100.00716.52
7.3.130.0080.01516.31
7.3.120.0050.01015.37
7.3.110.0050.00915.56
7.3.100.0070.00715.71
7.3.90.0050.01115.73
7.3.80.0100.00615.77
7.3.70.0060.00815.63
7.3.60.0080.00415.49
7.3.50.0080.00615.68
7.3.40.0080.00515.46
7.3.30.0060.00815.59
7.3.20.0080.00617.37
7.3.10.0080.00617.38
7.3.00.0030.01117.33
7.2.330.0100.01016.81
7.2.320.0090.01516.85
7.2.310.0110.00816.51
7.2.300.0000.01816.78
7.2.290.0150.00316.68
7.2.260.0030.02016.62
7.2.250.0140.00615.87
7.2.240.0080.01215.78
7.2.230.0050.01115.84
7.2.220.0030.01015.78
7.2.210.0120.00515.71
7.2.200.0030.01015.74
7.2.190.0080.00915.78
7.2.180.0070.00515.88
7.2.170.0060.00615.75
7.2.160.0100.00316.54
7.2.150.0030.00818.51
7.2.140.0060.00918.41
7.2.130.0030.01018.36
7.2.120.0030.01818.47
7.2.110.0070.01318.27
7.2.100.0120.00318.39
7.2.90.0060.00918.45
7.2.80.0130.00718.31
7.2.70.0080.00418.29
7.2.60.0000.01318.36
7.2.50.0040.01118.23
7.2.40.0100.00718.57
7.2.30.0040.00818.43
7.2.20.0030.00718.29
7.2.10.0060.00918.34
7.2.00.0060.01018.92
7.1.330.0070.00716.51
7.1.320.0010.01016.65
7.1.310.0070.00616.54
7.1.300.0060.00616.41
7.1.290.0030.00816.59
7.1.280.0030.01116.58
7.1.270.0040.00916.52
7.1.260.0040.00716.52
7.1.250.0080.00617.39
7.1.240.0090.00917.29
7.1.230.0040.01417.30
7.1.220.0070.00717.41
7.1.210.0060.01017.11
7.1.200.0070.00417.33
7.1.190.0040.00717.21
7.1.180.0080.00417.38
7.1.170.0070.00417.35
7.1.160.0050.00817.25
7.1.150.0060.00917.26
7.1.140.0060.00617.27
7.1.130.0060.01217.28
7.1.120.0030.01017.47
7.1.110.0000.01717.36
7.1.100.0040.00717.63
7.1.90.0040.01117.36
7.1.80.0000.01417.17
7.1.70.0020.01017.25
7.1.60.0090.01118.18
7.1.50.0110.01017.09
7.1.40.0100.00017.58
7.1.30.0120.00417.32
7.1.20.0000.01317.54
7.1.10.0040.01217.25
7.1.00.0050.02819.94
7.0.330.0060.01016.95
7.0.320.0120.00317.01
7.0.310.0090.00916.95
7.0.300.0040.01116.88
7.0.290.0040.00916.91
7.0.280.0070.01117.21
7.0.270.0110.00717.02
7.0.260.0060.00316.79
7.0.250.0060.00917.19
7.0.240.0060.00917.14
7.0.230.0040.00817.05
7.0.220.0030.00616.94
7.0.210.0040.01117.07
7.0.200.0050.00516.76
7.0.190.0090.00217.08
7.0.180.0080.00817.00
7.0.170.0110.00417.09
7.0.160.0060.00617.03
7.0.150.0090.00017.14
7.0.140.0070.03719.43
7.0.130.0090.00617.01
7.0.120.0040.01216.87
7.0.110.0110.00417.08
7.0.100.0170.02018.53
7.0.90.0190.02418.48
7.0.80.0210.01818.54
7.0.70.0140.02218.37
7.0.60.0060.02218.31
7.0.50.0210.03918.62
7.0.40.0060.02317.51
7.0.30.0060.02317.52
7.0.20.0030.04017.46
7.0.10.0030.04917.53
7.0.00.0030.03117.45
5.6.400.0030.01015.88
5.6.390.0040.01815.92
5.6.380.0080.00415.87
5.6.370.0080.00316.16
5.6.360.0030.01015.98
5.6.350.0030.01415.77
5.6.340.0000.01215.84
5.6.330.0070.01116.04
5.6.320.0070.00416.17
5.6.310.0140.00316.09
5.6.300.0060.00916.30
5.6.290.0000.01316.09
5.6.280.0030.04318.57
5.6.270.0130.00315.86
5.6.260.0000.01315.85
5.6.250.0040.02018.29
5.6.240.0020.02318.35
5.6.230.0080.02318.27
5.6.220.0050.02218.19
5.6.210.0030.02918.33
5.6.200.0040.02418.46
5.6.190.0070.02518.42
5.6.180.0050.04318.55
5.6.170.0060.02818.33
5.6.160.0080.02218.51
5.6.150.0060.02518.40
5.6.140.0060.02618.52
5.6.130.0050.02418.58
5.6.120.0060.03918.45
5.6.110.0030.03118.53
5.6.100.0050.04018.43
5.6.90.0070.02518.46
5.6.80.0060.04118.24
5.6.70.0020.03018.22
5.6.60.0050.02518.19
5.6.50.0030.02818.12
5.6.40.0000.04318.06
5.6.30.0070.03418.29
5.6.20.0030.04418.13
5.6.10.0070.03018.17
5.6.00.0050.02518.20
5.5.380.0060.02118.10
5.5.370.0080.02417.92
5.5.360.0040.02218.12
5.5.350.0040.02718.02
5.5.340.0080.02518.20
5.5.330.0070.03818.33
5.5.320.0060.02518.29
5.5.310.0070.02818.21
5.5.300.0080.02318.11
5.5.290.0000.03118.29
5.5.280.0080.04318.25
5.5.270.0060.02318.13
5.5.260.0050.04118.27
5.5.250.0080.04018.08
5.5.240.0100.03617.89
5.5.230.0050.02518.07
5.5.220.0050.02617.95
5.5.210.0040.02317.94
5.5.200.0050.02417.88
5.5.190.0040.02417.93
5.5.180.0050.04717.99
5.5.170.0080.00815.61
5.5.160.0050.04217.96
5.5.150.0080.02318.05
5.5.140.0030.04217.96
5.5.130.0040.02817.95
5.5.120.0050.04517.81
5.5.110.0060.02617.91
5.5.100.0080.02718.06
5.5.90.0050.02817.90
5.5.80.0090.02317.89
5.5.70.0070.02717.94
5.5.60.0080.03117.84
5.5.50.0080.03817.89
5.5.40.0050.02317.74
5.5.30.0120.02017.95
5.5.20.0030.02617.83
5.5.10.0140.03117.89
5.5.00.0070.04117.82
5.4.450.0080.02515.84
5.4.440.0070.02316.00
5.4.430.0020.02616.02
5.4.420.0100.01715.94
5.4.410.0070.02515.91
5.4.400.0020.02815.76
5.4.390.0050.03915.93
5.4.380.0040.02915.73
5.4.370.0020.02815.84
5.4.360.0090.01815.94
5.4.350.0080.04015.80
5.4.340.0050.02215.87
5.4.330.0100.00312.64
5.4.320.0050.02315.89
5.4.310.0040.04315.72
5.4.300.0080.02015.90
5.4.290.0030.02515.78
5.4.280.0050.03115.81
5.4.270.0040.04215.54
5.4.260.0080.02715.76
5.4.250.0020.03115.82
5.4.240.0090.02815.72
5.4.230.0030.03315.97
5.4.220.0060.04815.83
5.4.210.0030.03615.68
5.4.200.0050.02215.90
5.4.190.0090.01815.72
5.4.180.0000.03915.75
5.4.170.0050.03015.68
5.4.160.0020.02815.82
5.4.150.0080.03215.81
5.4.140.0050.02014.45
5.4.130.0070.02014.49
5.4.120.0030.02614.39
5.4.110.0050.02214.56
5.4.100.0050.02314.34
5.4.90.0050.02214.41
5.4.80.0030.03814.43
5.4.70.0100.01814.45
5.4.60.0040.02614.47
5.4.50.0070.02114.39
5.4.40.0100.03514.39
5.4.30.0120.01514.59
5.4.20.0050.02814.50
5.4.10.0070.02014.51
5.4.00.0070.02014.32
5.3.290.0050.02413.91
5.3.280.0060.03013.83
5.3.270.0130.02013.95
5.3.260.0060.02313.91
5.3.250.0090.04213.89
5.3.240.0050.03613.80
5.3.230.0060.02313.87
5.3.220.0100.02213.93
5.3.210.0120.04213.84
5.3.200.0080.02313.77
5.3.190.0090.02413.85
5.3.180.0070.03413.87
5.3.170.0070.04413.91
5.3.160.0080.02313.97
5.3.150.0070.02513.95
5.3.140.0060.02413.90
5.3.130.0130.04013.85
5.3.120.0090.02713.84
5.3.110.0090.03413.93
5.3.100.0060.02913.66
5.3.90.0080.02313.64
5.3.80.0060.02413.66
5.3.70.0080.02313.49
5.3.60.0100.03813.69
5.3.50.0060.03713.60
5.3.40.0020.03713.69
5.3.30.0070.02613.48
5.3.20.0070.04213.42
5.3.10.0060.02413.29
5.3.00.0070.02213.30
5.2.170.0030.02711.20
5.2.160.0030.02711.10
5.2.150.0070.02711.23
5.2.140.0000.03011.03
5.2.130.0030.02711.14
5.2.120.0070.05011.04
5.2.110.0030.03011.14
5.2.100.0030.02711.06
5.2.90.0000.03311.18
5.2.80.0100.05711.03
5.2.70.0030.05311.17
5.2.60.0130.05311.10
5.2.50.0000.03310.96
5.2.40.0000.03011.07
5.2.30.0030.05711.00
5.2.20.0000.03011.07
5.2.10.0030.03710.94
5.2.00.0000.03310.79
5.1.60.0100.03310.02
5.1.50.0000.02710.10
5.1.40.0030.02710.10
5.1.30.0030.02710.41
5.1.20.0070.02010.39
5.1.10.0030.02310.09
5.1.00.0100.04710.09
5.0.50.0070.0308.69
5.0.40.0070.0338.43
5.0.30.0030.0308.29
5.0.20.0030.0208.22
5.0.10.0030.0438.19
5.0.00.0030.0678.20
4.4.90.0000.0177.50
4.4.80.0030.0137.52
4.4.70.0000.0307.52
4.4.60.0000.0237.52
4.4.50.0030.0237.52
4.4.40.0000.0277.52
4.4.30.0000.0177.52
4.4.20.0030.0177.52
4.4.10.0070.0177.56
4.4.00.0070.0537.70
4.3.110.0000.0277.77
4.3.100.0000.0407.81
4.3.90.0000.0177.95
4.3.80.0000.0438.02
4.3.70.0030.0178.02
4.3.60.0000.0178.02
4.3.50.0030.0138.02
4.3.40.0030.0208.02
4.3.30.0030.0178.02
4.3.20.0030.0278.02
4.3.10.0000.0178.02
4.3.00.0000.0378.02

preferences:
54.08 ms | 401 KiB | 5 Q