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) { $result = array(); for($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); //array_unique($r, SORT_REGULAR); return implode("", $result); } $r = array(); //$letters = 'abcdefghijklm'; $letters = 'abc'; $len = strlen($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)
8.3.60.0090.01218.43
8.3.50.0150.00321.09
8.3.40.0150.00318.92
8.3.30.0040.01120.09
8.3.20.0050.00318.77
8.3.10.0030.00521.04
8.3.00.0060.00323.68
8.2.180.0090.00916.50
8.2.170.0150.00322.96
8.2.160.0090.00420.35
8.2.150.0040.00424.18
8.2.140.0080.00024.66
8.2.130.0100.00026.16
8.2.120.0040.00419.96
8.2.110.0000.00920.59
8.2.100.0080.00317.91
8.2.90.0080.00019.25
8.2.80.0000.00719.13
8.2.70.0060.00617.63
8.2.60.0040.00417.93
8.2.50.0030.00618.07
8.2.40.0040.00917.97
8.2.30.0040.00419.41
8.2.20.0030.00617.80
8.2.10.0040.00417.75
8.2.00.0040.00417.78
8.1.280.0060.01225.92
8.1.270.0080.00023.99
8.1.260.0000.00826.35
8.1.250.0070.00028.09
8.1.240.0040.00722.61
8.1.230.0080.00420.89
8.1.220.0030.00518.77
8.1.210.0040.00418.88
8.1.200.0070.00717.35
8.1.190.0000.00817.30
8.1.180.0050.00318.10
8.1.170.0060.00320.48
8.1.160.0060.00318.96
8.1.150.0030.00518.65
8.1.140.0040.00417.38
8.1.130.0030.00317.83
8.1.120.0040.00417.47
8.1.110.0030.00517.49
8.1.100.0000.00817.47
8.1.90.0030.00517.36
8.1.80.0000.00717.43
8.1.70.0070.00017.29
8.1.60.0030.00617.44
8.1.50.0000.00717.36
8.1.40.0080.00017.57
8.1.30.0040.00417.64
8.1.20.0030.00617.65
8.1.10.0050.00317.58
8.1.00.0040.00417.44
8.0.300.0060.00319.90
8.0.290.0070.00017.30
8.0.280.0030.00318.41
8.0.270.0030.00317.31
8.0.260.0000.00716.74
8.0.250.0030.00517.00
8.0.240.0040.00417.00
8.0.230.0040.00416.87
8.0.220.0030.00317.00
8.0.210.0000.00816.92
8.0.200.0080.00016.97
8.0.190.0090.00016.85
8.0.180.0000.01116.94
8.0.170.0040.00416.87
8.0.160.0080.00016.93
8.0.150.0070.00016.89
8.0.140.0090.00016.85
8.0.130.0050.00013.36
8.0.120.0040.00416.84
8.0.110.0050.00316.75
8.0.100.0040.00416.77
8.0.90.0030.00616.95
8.0.80.0090.00616.91
8.0.70.0000.00817.01
8.0.60.0000.00816.96
8.0.50.0040.00416.93
8.0.30.0090.01017.16
8.0.20.0070.01217.40
8.0.10.0040.00416.84
8.0.00.0050.01416.84
7.4.330.0000.00516.85
7.4.320.0070.00016.47
7.4.300.0030.00316.61
7.4.290.0030.00316.64
7.4.280.0000.00716.63
7.4.270.0070.00016.51
7.4.260.0050.00216.66
7.4.250.0070.00016.43
7.4.240.0040.00416.61
7.4.230.0030.00316.72
7.4.220.0070.01316.42
7.4.210.0070.00916.54
7.4.200.0000.00716.39
7.4.190.0040.00416.65
7.4.160.0130.01016.64
7.4.150.0170.00717.40
7.4.140.0090.01117.86
7.4.130.0050.01216.49
7.4.120.0100.00716.58
7.4.110.0130.00316.51
7.4.100.0100.00716.68
7.4.90.0090.01316.54
7.4.80.0000.01819.39
7.4.70.0130.01016.31
7.4.60.0090.00616.55
7.4.50.0050.00016.41
7.4.40.0000.01322.77
7.4.30.0100.00716.35
7.4.00.0070.00814.96
7.3.330.0000.00513.35
7.3.320.0020.00213.24
7.3.310.0070.00016.17
7.3.300.0070.00016.23
7.3.290.0030.01016.38
7.3.280.0100.00816.36
7.3.270.0100.01017.40
7.3.260.0090.01218.24
7.3.250.0080.01116.51
7.3.240.0110.00716.46
7.3.230.0120.00716.39
7.3.210.0100.00716.36
7.3.200.0050.01319.39
7.3.190.0030.01416.69
7.3.180.0040.01116.61
7.3.170.0030.01316.38
7.3.160.0070.01416.40
7.3.120.0100.00814.93
7.3.110.0150.00415.01
7.3.100.0040.01215.05
7.3.90.0090.00614.90
7.3.80.0070.01114.52
7.3.70.0060.00614.81
7.3.60.0000.00915.02
7.3.50.0030.01015.05
7.3.40.0030.01314.80
7.3.30.0040.00814.97
7.3.20.0060.00616.89
7.3.10.0050.01316.65
7.3.00.0030.01116.72
7.2.330.0070.01116.79
7.2.320.0150.00616.79
7.2.310.0160.00416.70
7.2.300.0070.01016.77
7.2.290.0050.01116.80
7.2.250.0080.01115.30
7.2.240.0110.00715.04
7.2.230.0080.00415.00
7.2.220.0110.00414.78
7.2.210.0080.00415.12
7.2.200.0070.00715.19
7.2.190.0100.00715.04
7.2.180.0110.00714.80
7.2.170.0090.00614.80
7.2.130.0090.00916.72
7.2.120.0070.00716.83
7.2.110.0060.00317.05
7.2.100.0090.00616.94
7.2.90.0110.00417.09
7.2.80.0070.00416.78
7.2.70.0130.00316.98
7.2.60.0040.01216.98
7.2.50.0030.01016.88
7.2.40.0000.01316.99
7.2.30.0070.00716.82
7.2.20.0120.00316.82
7.2.10.0070.00716.74
7.2.00.0000.01418.13
7.1.330.0040.01115.85
7.1.320.0060.00315.78
7.1.310.0080.00815.88
7.1.300.0100.00715.66
7.1.290.0090.00615.89
7.1.280.0030.01315.85
7.1.270.0000.01315.70
7.1.260.0090.00616.03
7.1.250.0040.01115.71
7.1.100.0040.00818.10
7.1.70.0000.00717.38
7.1.60.0100.01419.17
7.1.50.0110.01416.91
7.1.00.0000.06722.37
7.0.200.0000.00816.83
7.0.140.0070.06721.95
7.0.60.0070.08019.89
7.0.50.0000.04317.83
7.0.40.0130.04020.11
7.0.30.0430.07320.21
7.0.20.0300.04320.10
7.0.10.0130.08020.24
7.0.00.0030.04720.18
5.6.280.0100.06721.10
5.6.210.0070.08020.77
5.6.200.0030.08318.19
5.6.190.0030.06020.61
5.6.180.0370.07720.34
5.6.170.0230.07320.51
5.6.160.0170.07320.54
5.6.150.0070.03718.29
5.6.140.0030.04018.21
5.6.130.0100.08018.16
5.6.120.0070.04021.13
5.6.110.0100.08021.02
5.6.100.0000.04321.02
5.6.90.0030.08721.13
5.6.80.0100.07720.26
5.5.350.3770.04020.32
5.5.340.0070.08017.96
5.5.330.0000.04720.38
5.5.320.0100.04320.36
5.5.310.0230.04320.34
5.5.300.0130.07318.03
5.5.290.0130.08017.98
5.5.280.0030.04720.66
5.5.270.0030.07020.79
5.5.260.0070.08320.77
5.5.250.0100.05320.62
5.5.240.0100.08720.23
5.4.450.4370.05319.46
5.4.440.4070.05319.55
5.4.430.3830.03019.41
5.4.420.3600.04019.53
5.4.410.3670.04019.26
5.4.400.4100.03719.06
5.4.390.3800.03319.14
5.4.380.3570.03719.15
5.4.370.4230.03318.95
5.4.360.4000.04319.19
5.4.350.3630.04018.83
5.4.340.4230.03318.87
5.4.320.3370.03719.24
5.4.310.3700.03019.13
5.4.300.3470.03718.87
5.4.290.3670.03719.20
5.4.280.3830.04018.87
5.4.270.4170.03719.21
5.4.260.4100.04019.01
5.4.250.3770.04018.93
5.4.240.3430.04019.21
5.4.230.3770.03318.84
5.4.220.3770.03719.10
5.4.210.4200.03319.32
5.4.200.3700.03318.87
5.4.190.3700.03719.21
5.4.180.3770.04019.18
5.4.170.3800.04319.12
5.4.160.3530.04019.05
5.4.150.3530.03018.93
5.4.140.3970.03016.34
5.4.130.3370.03716.39
5.4.120.4130.03716.35
5.4.110.4070.03316.50
5.4.100.0100.06316.46
5.4.90.0000.04016.61
5.4.80.3600.03016.59
5.4.70.3670.03316.62
5.4.60.3500.03316.54
5.4.50.3500.03716.42
5.4.40.3470.03716.42
5.4.30.3500.03716.44
5.4.20.3930.03316.52
5.4.10.3430.04016.23
5.4.00.3030.03315.76
5.3.290.3930.04014.68
5.3.280.4230.04314.59
5.3.270.4030.03314.53
5.3.260.3600.04014.77
5.3.250.4070.04014.59
5.3.240.3570.03714.62
5.3.230.3630.04014.60
5.3.220.4170.04014.50
5.3.210.3900.03714.49
5.3.200.3370.03014.47
5.3.190.0030.04014.73
5.3.180.2300.03314.57
5.3.170.3470.04014.47
5.3.160.3730.02714.66
5.3.150.3330.03314.49
5.3.140.3200.03714.43
5.3.130.3630.03014.56
5.3.120.3270.03314.55
5.3.110.3500.04314.47
5.3.100.4030.04714.02
5.3.90.3430.03714.08
5.3.80.3930.04014.16
5.3.70.3770.03714.07
5.3.60.2870.03714.17
5.3.50.0030.07714.07
5.3.40.0930.03314.12
5.3.30.3400.04013.89
5.3.20.3670.04013.92
5.3.10.3470.04013.88
5.3.00.3630.03713.55
5.2.170.0000.04011.13
5.2.160.0000.06711.23
5.2.150.3070.03311.24
5.2.140.3070.03311.20
5.2.130.3330.02711.27
5.2.120.3170.02711.09
5.2.110.3170.02711.23
5.2.100.2530.03711.27
5.2.90.3270.03011.04
5.2.80.3030.03311.08
5.2.70.3170.03011.22
5.2.60.3200.02710.97
5.2.50.3630.03311.14
5.2.40.3100.03010.91
5.2.30.2670.03311.06
5.2.20.3000.03011.02
5.2.10.2670.03010.78
5.2.00.2830.03010.71
5.1.60.2770.02710.09
5.1.50.3130.02310.11
5.1.40.2470.0279.88
5.1.30.2730.02710.27
5.1.20.2370.02710.34
5.1.10.2830.02010.16
5.1.00.2830.03310.08
5.0.50.1430.0208.47
5.0.40.1300.0208.36
5.0.30.1670.0338.32
5.0.20.1200.0178.34
5.0.10.1500.0208.09
5.0.00.1330.0308.17
4.4.90.0770.0375.89
4.4.80.1270.0135.79
4.4.70.1670.0175.82
4.4.60.1300.0205.89
4.4.50.1300.0175.87
4.4.40.1400.0275.96
4.4.30.1700.0175.82
4.4.20.1130.0175.90
4.4.10.1370.0135.91
4.4.00.1330.0275.91
4.3.110.1300.0205.77
4.3.100.1200.0175.75
4.3.90.1170.0175.73
4.3.80.1170.0275.70
4.3.70.1400.0135.80
4.3.60.1300.0075.83
4.3.50.1400.0205.79
4.3.40.1330.0275.71
4.3.30.0600.0135.49
4.3.20.0800.0235.49
4.3.10.0930.0235.49
4.3.00.0870.0235.49

preferences:
39.71 ms | 401 KiB | 5 Q