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; } print_r("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 = 'abcdefg'; $len = strlen($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)
8.3.60.0280.02416.88
8.3.50.0340.02721.83
8.3.40.0390.03119.14
8.3.30.0270.02019.26
8.3.20.0270.01720.54
8.3.10.0070.00723.61
8.3.00.0200.00820.77
8.2.180.0140.02016.63
8.2.170.0210.02122.96
8.2.160.0140.02420.74
8.2.150.0230.01024.18
8.2.140.0250.00824.66
8.2.130.0150.00626.16
8.2.120.0130.02220.91
8.2.110.0330.00820.68
8.2.100.0310.00618.04
8.2.90.0140.00818.40
8.2.80.0100.01018.00
8.2.70.0000.02217.88
8.2.60.0090.01218.28
8.2.50.0070.01418.07
8.2.40.0100.01020.07
8.2.30.0040.01818.70
8.2.20.0090.01218.19
8.2.10.0040.00818.37
8.2.00.0090.01318.05
8.1.280.0200.03025.92
8.1.270.0210.02123.87
8.1.260.0140.01026.35
8.1.250.0240.01028.09
8.1.240.0050.03022.69
8.1.230.0220.01421.35
8.1.220.0000.01517.74
8.1.210.0090.01219.34
8.1.200.0070.01317.48
8.1.190.0120.00917.61
8.1.180.0100.00318.10
8.1.170.0090.01219.03
8.1.160.0030.01722.42
8.1.150.0090.01219.18
8.1.140.0090.01217.98
8.1.130.0040.01118.16
8.1.120.0000.01417.81
8.1.110.0070.01317.98
8.1.100.0090.01217.93
8.1.90.0070.01817.96
8.1.80.0000.01317.76
8.1.70.0100.01417.90
8.1.60.0000.01217.80
8.1.50.0030.01917.96
8.1.40.0070.01618.08
8.1.30.0130.01018.05
8.1.20.0030.01918.13
8.1.10.0060.01518.08
8.1.00.0200.00718.03
8.0.300.0120.00920.49
8.0.290.0040.01117.18
8.0.280.0070.01518.79
8.0.270.0090.01217.51
8.0.260.0110.01417.66
8.0.250.0040.02117.34
8.0.240.0110.01117.30
8.0.230.0090.01517.27
8.0.220.0050.00517.02
8.0.210.0070.01317.29
8.0.200.0060.00617.06
8.0.190.0000.01516.96
8.0.180.0060.01917.28
8.0.170.0000.02217.39
8.0.160.0000.02717.19
8.0.150.0070.01017.02
8.0.140.0070.01817.30
8.0.130.0060.00613.58
8.0.120.0070.01417.24
8.0.110.0110.01117.27
8.0.100.0070.01817.21
8.0.90.0070.01617.24
8.0.80.0100.03417.04
8.0.70.0030.00917.02
8.0.60.0030.01717.16
8.0.50.0000.01116.86
8.0.30.0280.04817.43
8.0.20.0250.04917.50
8.0.10.0070.01317.37
8.0.00.0500.03517.17
7.4.330.0030.02115.05
7.4.320.0040.00816.64
7.4.300.0090.01516.95
7.4.290.0100.01017.01
7.4.280.0160.01016.79
7.4.270.0070.01416.86
7.4.260.0100.00716.66
7.4.250.0100.01316.85
7.4.240.0110.01216.73
7.4.230.0100.01317.04
7.4.220.0170.04217.07
7.4.210.0080.04717.02
7.4.200.0080.01216.86
7.4.190.0030.01016.79
7.4.160.0500.03316.86
7.4.150.0410.02417.40
7.4.140.0300.05117.86
7.4.130.0360.05517.00
7.4.120.0390.04617.00
7.4.110.0550.07416.80
7.4.100.0570.06116.94
7.4.90.0350.01816.88
7.4.80.0350.06019.39
7.4.70.0290.02916.93
7.4.60.0130.01616.70
7.4.50.0060.00816.52
7.4.40.0270.02716.84
7.4.30.0200.03316.94
7.3.330.0070.01413.71
7.3.320.0000.01213.60
7.3.310.0190.00916.56
7.3.300.0040.01616.48
7.3.290.0220.01916.41
7.3.280.0140.05416.61
7.3.270.0310.03817.40
7.3.260.0920.05816.68
7.3.250.0320.04616.80
7.3.240.0310.03816.93
7.3.230.0100.02316.68
7.3.210.0420.04316.83
7.3.200.0470.03919.39
7.3.190.0700.04916.95
7.3.180.0420.03116.80
7.3.170.0170.03716.69
7.3.160.0370.06216.64
7.2.330.0300.06816.75
7.2.320.0310.04617.01
7.2.310.0380.06317.06
7.2.300.0280.04916.98
7.2.290.0170.04716.80
7.2.100.0920.02514.60
7.2.90.3890.02315.06
7.2.80.2340.01414.81
7.2.70.0540.03315.11
7.2.60.0740.01215.02
7.2.50.2390.01314.79
7.2.40.0650.02215.12
7.2.30.0490.03515.26
7.2.20.0680.01314.95
7.2.10.0090.02314.90
7.2.00.0260.01115.23
7.1.220.1050.01713.84
7.1.210.0220.03814.09
7.1.200.3550.01914.07
7.1.190.3010.05614.19
7.1.180.0260.03014.16
7.1.170.2270.02313.89
7.1.160.0470.02214.00
7.1.150.0900.00914.11
7.1.140.1340.01913.89
7.1.130.0590.04514.10
7.1.120.0120.01413.84
7.1.110.0090.01813.86
7.1.100.0220.02714.02
7.1.90.0440.03114.20
7.1.80.2210.01714.10
7.1.70.1730.03514.14
7.1.60.1780.03032.43
7.1.50.0560.01632.19
7.1.40.1270.03132.20
7.1.30.1750.04632.12
7.1.20.0420.02832.23
7.1.10.2020.02013.79
7.1.00.0310.03213.95
7.0.310.2870.01313.41
7.0.300.1880.00813.48
7.0.290.0280.01113.36
7.0.280.0640.00713.50
7.0.270.0320.02113.79
7.0.260.0410.01313.37
7.0.250.0810.02413.36
7.0.240.1120.03613.56
7.0.230.2770.01913.46
7.0.220.2560.02913.77
7.0.210.2370.00913.34
7.0.200.0960.04313.55
7.0.190.0920.02113.93
7.0.180.1580.03013.81
7.0.170.0260.03013.83
7.0.160.0260.02913.88
7.0.150.0340.03113.74
7.0.140.1170.01013.52
7.0.130.0160.03714.07
7.0.120.0380.02913.93
7.0.110.0210.01413.41
7.0.100.0370.02313.84
7.0.90.1880.01613.71
7.0.80.0290.01413.87
7.0.70.2090.00713.59
7.0.60.1940.01213.54
7.0.50.0480.00813.80
7.0.40.0320.01313.73
7.0.30.0840.03014.01
7.0.20.0290.02213.96
7.0.10.0230.01613.60
7.0.00.1940.03414.01
5.6.380.0160.02615.13
5.6.370.0240.04115.06
5.6.360.0150.02715.00
5.6.350.0240.05115.18
5.6.340.0460.04915.35
5.6.330.0170.02514.91
5.6.320.0060.02614.39
5.6.310.0100.03815.11
5.6.300.0030.05114.88
5.6.290.0140.04315.06
5.6.280.0040.05415.45
5.6.270.0330.03615.03
5.6.260.0130.06715.67
5.6.250.0090.03514.65
5.6.240.0190.04815.38
5.6.230.0230.01615.07
5.6.220.0130.02414.93
5.6.210.0140.02314.83
5.6.200.0100.06215.77
5.6.190.0200.03215.25
5.6.180.0040.05515.47
5.6.170.0240.04215.50
5.6.160.0220.04015.80
5.6.150.0160.03315.47
5.6.140.0100.04615.02
5.6.130.0320.04415.44
5.6.120.0040.04815.33
5.6.110.0130.01914.88
5.6.100.0110.02214.96
5.6.90.0000.03514.74
5.6.80.0080.03314.70
5.6.70.0140.02614.50
5.6.60.0260.06315.89
5.6.50.0130.02514.67
5.6.40.0130.04715.12
5.6.30.0170.04815.48
5.6.20.0160.02714.93
5.6.10.0100.02214.70
5.6.00.0130.03214.93
5.5.380.0120.04912.14
5.5.370.0230.03811.73
5.5.360.0420.06812.66
5.5.350.0150.06012.58
5.5.340.0230.02311.73
5.5.330.0130.03612.00
5.5.320.0140.03011.95
5.5.310.0170.02111.80
5.5.300.0160.02911.80
5.5.290.0160.02411.88
5.5.280.0120.08712.48
5.5.270.0060.03511.87
5.5.260.0100.02811.77
5.5.250.0110.04612.26
5.5.240.0070.03311.74
5.5.230.0250.04512.51
5.5.220.0120.02211.83
5.5.210.0090.02411.77
5.5.200.0130.03811.84
5.5.190.0270.04612.33
5.5.180.0230.05412.76
5.5.170.0130.05215.19
5.5.160.0110.01911.84
5.5.150.0140.02211.73
5.4.450.0060.04212.11
5.4.440.0150.04412.23
5.4.430.0280.03912.08
5.4.420.0140.01711.73
5.4.410.0030.07212.23
5.4.400.0100.04011.75
5.4.390.0070.02611.81
5.4.380.0140.04012.37
5.4.370.0120.03611.91
5.4.360.0180.04512.09
5.4.350.0030.04211.73
5.4.340.0120.01911.73
5.4.330.0030.03011.73
5.4.320.0210.06012.33
5.3.290.0170.03111.73

preferences:
43.61 ms | 401 KiB | 5 Q