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); return implode("", $result); } $r = array(); //$letters = 'abcdefghijklm'; $letters = 'abcdefghi'; $len = strlen($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)); 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)
8.3.60.0131.99168.61
8.3.50.0751.93462.62
8.3.40.0400.96045.05
8.3.30.0401.01546.38
8.3.20.0170.52744.83
8.3.10.0070.53545.83
8.3.00.0030.53548.38
8.2.180.0671.94164.93
8.2.170.0331.00344.84
8.2.160.0271.06146.53
8.2.150.0130.54945.00
8.2.140.0300.52246.41
8.2.130.0030.56946.71
8.2.120.0070.53445.95
8.2.110.0170.82945.72
8.2.100.0270.77643.98
8.2.90.0170.77145.05
8.2.80.0070.72545.41
8.2.70.0170.79543.70
8.2.60.0070.80843.99
8.2.50.0270.92540.65
8.2.40.0170.78344.27
8.2.30.0170.78045.29
8.2.20.0070.80743.66
8.2.10.0100.80443.82
8.2.00.0300.87243.77
8.1.280.0731.09551.84
8.1.270.0130.24538.00
8.1.260.0130.23036.26
8.1.250.0130.23538.37
8.1.240.0100.35540.04
8.1.230.0100.33836.88
8.1.220.0130.35433.50
8.1.210.0200.31835.12
8.1.200.0200.34333.23
8.1.190.0230.34233.47
8.1.180.0170.34733.55
8.1.170.0130.33634.63
8.1.160.0030.36235.00
8.1.150.0130.34034.80
8.1.140.0100.35233.52
8.1.130.0070.34533.94
8.1.120.0100.40033.52
8.1.110.0170.34133.43
8.1.100.0200.34933.49
8.1.90.0100.36233.49
8.1.80.0070.34733.41
8.1.70.0100.34533.46
8.1.60.0270.35833.55
8.1.50.0270.35833.54
8.1.40.0070.38433.60
8.1.30.0200.36433.66
8.1.20.0070.38333.70
8.1.10.0170.81451.73
8.1.00.0230.82251.55
8.0.300.0230.74453.95
8.0.290.0170.76651.21
8.0.280.0170.75452.31
8.0.270.0300.72651.26
8.0.260.0130.78850.84
8.0.250.0170.76151.01
8.0.240.0330.76050.80
8.0.230.0200.76350.87
8.0.220.0070.80350.71
8.0.210.0300.77750.87
8.0.200.0200.79350.94
8.0.190.0470.96051.03
8.0.180.0100.82350.80
8.0.170.0200.82150.79
8.0.160.0100.83950.85
8.0.150.0200.81650.88
8.0.140.0130.82350.76
8.0.130.0501.752109.20
8.0.120.0200.83650.93
8.0.110.0230.81050.88
8.0.100.0200.82250.75
8.0.90.0130.83050.69
8.0.80.0501.22850.80
8.0.70.0200.81650.86
8.0.60.0330.81550.88
8.0.50.0230.81650.86
8.0.30.0631.26051.02
8.0.20.0861.24851.07
8.0.10.0500.92551.01
8.0.00.0881.48650.85
7.4.330.0430.73449.00
7.4.320.0300.78050.43
7.4.300.0430.92950.46
7.4.290.0300.86250.38
7.4.280.0270.99250.54
7.4.270.0431.01250.61
7.4.260.0801.909109.30
7.4.250.0330.89850.50
7.4.240.0130.87750.38
7.4.230.0130.87150.52
7.4.220.0461.57650.50
7.4.210.0411.34950.59
7.4.200.0130.87450.20
7.4.190.0270.86650.41
7.4.160.0671.35650.55
7.4.150.0561.44550.53
7.4.140.0611.42050.60
7.4.130.0751.54450.57
7.4.120.0681.29150.56
7.4.110.0821.38650.50
7.4.100.0461.33250.43
7.4.90.1041.58950.69
7.4.80.0561.82250.48
7.4.70.1041.58150.62
7.4.60.0531.27250.57
7.4.50.0170.66650.63
7.4.40.0301.53650.57
7.4.30.0691.31650.47
7.4.00.0101.69348.72
7.3.330.0431.868109.16
7.3.320.0571.94778.69
7.3.310.0230.92450.17
7.3.300.0130.93150.25
7.3.290.0401.48250.34
7.3.280.0611.53350.33
7.3.270.0731.50350.72
7.3.260.0831.54750.47
7.3.250.0751.50850.47
7.3.240.0701.51550.65
7.3.230.0391.47450.35
7.3.210.0621.64450.32
7.3.200.0702.39749.64
7.3.190.0721.84950.58
7.3.180.1041.70850.61
7.3.170.0661.50750.29
7.3.160.0461.51650.50
7.3.120.0131.62848.61
7.2.330.0561.41950.82
7.2.320.0762.12350.77
7.2.310.0791.60650.86
7.2.300.0731.50250.80
7.2.290.0431.58050.82
7.2.60.0731.03150.95
7.2.00.1361.11953.46
7.1.200.0731.07049.80
7.1.100.8090.89644.00
7.1.70.0101.18451.10
7.1.61.2541.23447.57
7.1.50.0171.09151.13
7.1.00.0001.29056.26
7.0.200.0500.63036.55
7.0.140.0001.69056.04
7.0.110.2100.98354.03
7.0.100.0201.04053.97
7.0.90.7330.95354.12
7.0.80.7571.07354.11
7.0.70.7831.05754.09
7.0.60.7231.10054.11
7.0.50.4830.91754.11
7.0.40.4531.05035.84
7.0.30.4471.09335.70
7.0.20.4601.06735.79
7.0.10.5930.95035.82
7.0.00.0971.02035.69
5.6.280.0231.94785.66
5.6.260.0201.38085.19
5.6.250.0171.54785.22
5.6.240.0231.48785.23
5.6.230.0071.51785.25
5.6.220.0301.59085.21
5.6.210.0131.40385.09
5.6.200.0331.45085.22
5.6.190.0171.38385.18
5.6.180.0201.35085.18
5.6.170.0201.49385.22
5.6.160.0331.56385.18
5.6.150.0471.56785.16
5.6.140.0201.54785.09
5.6.130.0271.49385.39
5.6.120.0271.52785.18
5.6.110.0201.51785.14
5.6.100.0171.43785.08
5.6.90.0201.32085.10
5.6.80.0201.51384.60
5.6.70.0401.52084.61
5.6.60.0271.46384.50
5.6.50.0231.45784.55
5.6.40.0101.38784.55
5.6.30.0371.44084.49
5.6.20.0131.30784.57
5.6.10.0131.48384.48
5.6.00.0401.57784.54
5.5.380.0271.56082.22
5.5.370.0331.50782.12
5.5.360.0231.64382.07
5.5.350.0201.67082.00
5.5.340.0201.37382.65
5.5.330.0301.66082.44
5.5.320.0301.58782.48
5.5.310.0301.68082.44
5.5.300.0331.63082.40
5.5.290.0331.55382.58
5.5.280.0131.59082.43
5.5.270.0131.56782.44
5.5.260.0231.63382.42
5.5.250.0231.50082.39
5.5.240.0231.64381.86
5.5.230.0171.39381.96
5.5.220.0131.36382.00
5.5.210.0201.53381.93
5.5.200.0301.54781.93
5.5.190.0271.58781.80
5.5.180.0231.41781.77
5.5.160.0271.54782.03
5.5.150.0201.37381.78
5.5.140.0201.62381.86
5.5.130.0171.57381.82
5.5.120.0401.54781.72
5.5.110.0401.57781.90
5.5.100.0071.60781.68
5.5.90.0301.37781.92
5.5.80.0201.71781.80
5.5.70.0171.48381.91
5.5.60.0271.42381.79
5.5.50.0331.37081.85
5.5.40.1071.50781.89
5.5.30.0201.61781.88
5.5.20.0271.50381.71
5.5.10.0331.41081.59
5.5.00.0131.35781.66
5.4.450.0171.55084.14
5.4.440.2101.52083.80
5.4.430.0101.55383.77
5.4.420.0271.47083.73
5.4.410.0231.44083.93
5.4.400.0271.44783.82
5.4.390.0301.52783.73
5.4.380.0231.39783.57
5.4.370.0171.52783.42
5.4.360.0231.58383.47
5.4.350.0271.43783.63
5.4.340.0171.55083.65
5.4.320.0431.57083.57
5.4.310.0201.41383.52
5.4.300.0271.51383.45
5.4.290.0271.38083.65
5.4.280.0231.53083.55
5.4.270.0101.53383.47
5.4.260.1701.35783.73
5.4.250.0301.50083.41
5.4.240.0071.53783.45
5.4.230.0171.56383.57
5.4.220.0201.35383.46
5.4.210.0331.37383.53
5.4.200.0271.52083.64
5.4.190.0231.52383.56
5.4.180.0231.56083.48
5.4.170.0231.55383.40
5.4.160.0131.47083.80
5.4.150.0331.53783.49
5.4.140.0271.59781.05
5.4.130.0371.52780.77
5.4.120.0331.61781.05
5.4.110.0201.39781.04
5.4.100.0101.55781.01
5.4.90.0331.37780.96
5.4.80.0331.60380.82
5.4.70.0101.42780.97
5.4.60.0201.52381.02
5.4.50.0331.32080.94
5.4.40.0231.68080.79
5.4.30.0201.51780.91
5.4.20.0171.56080.75
5.4.10.0171.66380.98
5.4.00.0131.53780.30
5.3.290.0231.75777.95
5.3.280.0331.73777.82
5.3.270.0171.76377.88
5.3.260.0231.70077.97
5.3.250.0301.84077.80
5.3.240.0201.59377.80
5.3.230.0271.76077.81
5.3.220.0031.83777.63
5.3.210.0371.60077.85
5.3.200.0101.75378.02
5.3.190.0231.82077.78
5.3.180.0331.76077.76
5.3.170.0201.53077.75
5.3.160.0171.68778.01
5.3.150.0101.80377.84
5.3.140.0231.63077.61
5.3.130.0201.92077.77
5.3.120.0131.67377.68
5.3.110.0231.56777.77
5.3.100.0171.69077.24
5.3.90.0201.73077.32
5.3.80.0171.78377.23
5.3.70.0131.78377.16
5.3.60.0501.75777.22
5.3.50.0201.70777.11
5.3.40.0401.80377.10
5.3.30.0101.66377.01
5.3.20.3001.86076.99
5.3.10.0371.72776.95
5.3.00.0271.78776.79
5.2.170.0101.87074.55
5.2.160.0131.92774.68
5.2.150.0232.02774.55
5.2.140.0171.77774.61
5.2.130.0071.80774.57
5.2.120.2101.93374.56
5.2.110.0201.95774.55
5.2.100.0132.04074.56
5.2.90.0172.00074.57
5.2.80.0131.95774.56
5.2.70.0131.80774.51
5.2.60.0101.96074.75
5.2.50.0201.86774.65
5.2.40.0201.96074.86
5.2.30.0201.91074.68
5.2.20.0231.99374.63
5.2.10.0271.86074.81
5.2.00.0232.47786.55
5.1.60.0332.470109.59
5.1.50.0102.493111.60
5.1.40.0272.477116.88
5.1.30.0232.480113.32
5.1.20.1032.400111.77
5.1.10.0402.463111.30
5.1.00.0302.473114.96
5.0.50.0402.46367.17
5.0.40.0102.49073.38
5.0.30.0202.48373.03
5.0.20.0132.48771.96
5.0.10.0232.47770.61
5.0.00.0102.49069.05
4.4.90.0202.48376.88
4.4.80.0272.47774.75
4.4.70.0332.46779.29
4.4.60.0172.48778.96
4.4.50.0202.48086.20
4.4.40.0072.49379.06
4.4.30.0272.47778.70
4.4.20.0372.46780.96
4.4.10.0332.45078.68
4.4.00.0172.48785.13
4.3.110.0272.47774.01
4.3.100.0172.48776.40
4.3.90.0232.48084.09
4.3.80.0232.47778.74
4.3.70.0202.48076.55
4.3.60.0032.49778.82
4.3.50.0202.48077.09
4.3.40.0202.48382.79
4.3.30.0302.47072.60
4.3.20.0132.48782.05
4.3.10.0232.48087.01
4.3.00.0332.46775.19

preferences:
36.12 ms | 401 KiB | 5 Q