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, $pos+1); } return trim($result, ","); } $letters = 'abc'; $r = array(); //echo '1 letters from 4: '; for($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)
8.3.60.0090.00618.29
8.3.50.0110.00622.05
8.3.40.0150.00018.71
8.3.30.0170.00020.39
8.3.20.0030.00618.82
8.3.10.0040.00421.00
8.3.00.0000.00919.68
8.2.180.0070.01416.75
8.2.170.0120.00322.96
8.2.160.0100.00320.35
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0040.00420.08
8.2.110.0000.00920.52
8.2.100.0090.00317.72
8.2.90.0000.00819.39
8.2.80.0040.00419.40
8.2.70.0060.00317.38
8.2.60.0040.00417.93
8.2.50.0040.00418.07
8.2.40.0090.00019.95
8.2.30.0000.00721.23
8.2.20.0080.00017.79
8.2.10.0040.00417.66
8.2.00.0040.00717.63
8.1.280.0070.00725.92
8.1.270.0080.00023.99
8.1.260.0040.00426.35
8.1.250.0050.00328.09
8.1.240.0100.00022.55
8.1.230.0040.00820.91
8.1.220.0000.00818.77
8.1.210.0030.00518.86
8.1.200.0100.00017.25
8.1.190.0040.00417.53
8.1.180.0000.00818.10
8.1.170.0040.00418.52
8.1.160.0030.00618.84
8.1.150.0070.00018.55
8.1.140.0040.00417.37
8.1.130.0030.00317.83
8.1.120.0040.00317.49
8.1.110.0030.00617.45
8.1.100.0050.00317.36
8.1.90.0040.00417.43
8.1.80.0030.00317.36
8.1.70.0070.00017.45
8.1.60.0050.00317.56
8.1.50.0070.00017.38
8.1.40.0040.00417.52
8.1.30.0000.00917.48
8.1.20.0000.00817.59
8.1.10.0000.00717.50
8.1.00.0070.00417.45
8.0.300.0000.00919.98
8.0.290.0070.00017.05
8.0.280.0000.00718.37
8.0.270.0000.00717.26
8.0.260.0000.00716.70
8.0.250.0000.00716.94
8.0.240.0040.00416.95
8.0.230.0070.00016.98
8.0.220.0040.00416.91
8.0.210.0070.00016.79
8.0.200.0070.00016.95
8.0.190.0000.00716.95
8.0.180.0070.00016.81
8.0.170.0050.00316.79
8.0.160.0050.00316.80
8.0.150.0030.00516.86
8.0.140.0030.00516.89
8.0.130.0030.00313.26
8.0.120.0000.00816.77
8.0.110.0070.00016.69
8.0.100.0040.00416.86
8.0.90.0000.00716.79
8.0.80.0070.01116.89
8.0.70.0000.00716.86
8.0.60.0000.00716.86
8.0.50.0040.00416.81
8.0.30.0120.00917.08
8.0.20.0060.01117.40
8.0.10.0000.00716.98
8.0.00.0100.00716.68
7.4.330.0000.00516.79
7.4.320.0000.00616.59
7.4.300.0030.00316.43
7.4.290.0000.00716.61
7.4.280.0000.00616.51
7.4.270.0050.00316.57
7.4.260.0050.00013.29
7.4.250.0040.00416.55
7.4.240.0030.00316.42
7.4.230.0020.00516.45
7.4.220.0070.01116.53
7.4.210.0090.00816.58
7.4.200.0030.00516.41
7.4.190.0030.00316.64
7.4.160.0110.00816.51
7.4.150.0130.01017.40
7.4.140.0150.00317.86
7.4.130.0080.00916.54
7.4.120.0150.00816.46
7.4.110.0130.00316.55
7.4.100.0130.01016.59
7.4.90.0140.00416.56
7.4.80.0100.01019.39
7.4.70.0100.00716.50
7.4.60.0060.01016.48
7.4.50.0040.00416.55
7.4.40.0090.00622.77
7.4.30.0130.00316.61
7.4.00.0120.00315.13
7.3.330.0030.00313.23
7.3.320.0030.00313.37
7.3.310.0030.00316.34
7.3.300.0000.00716.23
7.3.290.0080.00516.46
7.3.280.0070.00916.41
7.3.270.0080.00917.40
7.3.260.0090.01318.24
7.3.250.0090.01116.51
7.3.240.0090.00916.37
7.3.230.0120.00616.52
7.3.210.0060.01016.50
7.3.200.0140.00719.39
7.3.190.0070.01716.57
7.3.180.0100.00616.39
7.3.170.0100.00916.57
7.3.160.0050.01116.53
7.3.120.0030.01314.77
7.2.330.0090.00916.77
7.2.320.0070.01016.77
7.2.310.0070.01416.57
7.2.300.0030.01316.57
7.2.290.0100.00616.73
7.2.00.0000.01519.38
7.1.100.0060.00618.17
7.1.70.0000.00817.21
7.1.60.0030.00717.41
7.1.50.0070.01717.00
7.1.00.0070.06322.34
7.0.200.0100.00016.96
7.0.140.0130.06321.95
7.0.100.0270.09019.95
7.0.90.0330.07320.13
7.0.80.0030.09019.85
7.0.70.0070.08319.93
7.0.60.0100.08019.90
7.0.50.0030.06320.36
7.0.40.0230.06320.05
7.0.30.0070.08720.11
7.0.20.0000.06320.10
7.0.10.0100.08719.95
7.0.00.0170.07019.91
5.6.280.0100.06021.09
5.6.250.0130.06320.51
5.6.240.0070.09020.67
5.6.230.0070.08320.74
5.6.220.0030.08020.66
5.6.210.0070.08020.69
5.6.200.0100.04721.05
5.6.190.0130.08021.06
5.6.180.0100.07721.06
5.6.170.0100.08321.07
5.6.160.0030.08021.14
5.6.150.0070.07321.09
5.6.140.0100.08021.06
5.6.130.0170.06320.95
5.6.120.0030.09320.98
5.6.110.0070.08021.11
5.6.100.0200.07021.02
5.6.90.0070.06721.09
5.6.80.0070.06020.46
5.6.70.0030.05020.39
5.6.60.0100.08020.39
5.6.50.0070.08020.30
5.6.40.0070.06320.42
5.6.30.0000.08020.43
5.6.20.0170.06720.39
5.6.10.0130.07020.44
5.6.00.0070.07020.37
5.5.380.0070.07720.43
5.5.370.0030.04720.38
5.5.360.0100.08720.43
5.5.350.0070.08020.43
5.5.340.0200.07320.94
5.5.330.0100.07320.91
5.5.320.0130.07720.93
5.5.310.0070.05320.82
5.5.300.0100.05020.91
5.5.290.0030.06720.64
5.5.280.0030.05720.82
5.5.270.0130.07020.78
5.5.260.0130.05720.87
5.5.250.0100.08020.62
5.5.240.0100.07720.18
5.5.230.0030.08320.01
5.5.220.0030.08320.27
5.5.210.0070.07320.17
5.5.200.0100.07020.23
5.5.190.0000.08020.10
5.5.180.0130.03320.16
5.5.160.0030.08020.21
5.5.150.0070.07320.21
5.5.140.0070.07720.13
5.5.130.0100.07720.17
5.5.120.0070.08019.99
5.5.110.0100.07720.14
5.5.100.0100.07319.95
5.5.90.0170.07020.11
5.5.80.0130.06720.02
5.5.70.0100.08020.04
5.5.60.0100.07320.07
5.5.50.0070.07720.09
5.5.40.0100.07320.16
5.5.30.0070.08020.07
5.5.20.0070.07720.06
5.5.10.0070.04319.99
5.5.00.0130.06720.07
5.4.450.0130.07319.43
5.4.440.0230.05719.37
5.4.430.0070.08319.43
5.4.420.0130.07319.45
5.4.410.0070.08319.33
5.4.400.0070.04719.16
5.4.390.0100.06718.92
5.4.380.0000.08719.14
5.4.370.0170.06719.05
5.4.360.0100.04019.04
5.4.350.0130.05319.19
5.4.340.0000.07719.04
5.4.320.0070.08019.17
5.4.310.0100.06719.19
5.4.300.0070.07718.95
5.4.290.0130.07018.87
5.4.280.0000.08319.05
5.4.270.0030.07319.14
5.4.260.0130.07319.23
5.4.250.0070.07319.04
5.4.240.0070.07719.12
5.4.230.0200.06719.14
5.4.220.0070.04719.02
5.4.210.0030.07318.90
5.4.200.0030.04719.12
5.4.190.0030.07719.04
5.4.180.0030.08018.87
5.4.170.0070.05318.89
5.4.160.0100.08019.11
5.4.150.0130.06719.12
5.4.140.0130.06316.32
5.4.130.0030.07316.40
5.4.120.0100.07016.47
5.4.110.0100.07316.45
5.4.100.0070.04016.33
5.4.90.0070.04316.42
5.4.80.0030.07716.52
5.4.70.0100.06016.35
5.4.60.0100.06716.48
5.4.50.0030.04716.46
5.4.40.0070.07016.38
5.4.30.0130.07016.48
5.4.20.0100.03316.29
5.4.10.0070.07716.44
5.4.00.0170.05315.64
5.3.290.0070.06014.60
5.3.280.0070.08014.71
5.3.270.0130.03014.71
5.3.260.0070.07314.68
5.3.250.0100.06014.68
5.3.240.0130.07014.72
5.3.230.0070.05714.53
5.3.220.0070.06014.56
5.3.210.0100.06714.71
5.3.200.0070.07014.72
5.3.190.0170.07014.50
5.3.180.0070.05314.71
5.3.170.0030.04314.56
5.3.160.0070.07314.51
5.3.150.0030.03714.64
5.3.140.0070.07314.59
5.3.130.0070.04714.57
5.3.120.0070.04014.54
5.3.110.0000.04014.61
5.3.100.0070.04314.15
5.3.90.0130.06314.09
5.3.80.0100.06013.91
5.3.70.0030.07014.08
5.3.60.0170.07014.04
5.3.50.0070.04313.97
5.3.40.0030.04014.09
5.3.30.0030.05713.83
5.3.20.0030.08013.71
5.3.10.0100.06013.57
5.3.00.0100.04313.55
5.2.170.0000.04011.21
5.2.160.0070.03011.07
5.2.150.0030.05011.07
5.2.140.0070.05711.06
5.2.130.0000.04311.13
5.2.120.0030.06011.12
5.2.110.0070.05311.16
5.2.100.0030.03311.11
5.2.90.0000.03711.17
5.2.80.0100.05711.05
5.2.70.0130.02711.05
5.2.60.0100.04711.05
5.2.50.0070.05711.05
5.2.40.0070.04011.05
5.2.30.0070.04011.09
5.2.20.0130.01711.11
5.2.10.0070.05711.05
5.2.00.0030.05311.05
5.1.60.0000.05711.05
5.1.50.0030.05711.05
5.1.40.0070.05011.05
5.1.30.0070.03011.05
5.1.20.0030.05311.05
5.1.10.0030.05311.05
5.1.00.0030.05711.05
5.0.50.0000.04711.05
5.0.40.0030.02711.05
5.0.30.0030.03011.05
5.0.20.0070.04011.05
5.0.10.0000.02311.05
5.0.00.0000.03711.05
4.4.90.0030.01711.05
4.4.80.0000.02711.05
4.4.70.0100.03011.05
4.4.60.0030.03011.05
4.4.50.0000.01311.05
4.4.40.0030.05011.05
4.4.30.0030.03311.05
4.4.20.0000.03711.05
4.4.10.0000.02011.05
4.4.00.0000.05711.05
4.3.110.0030.03011.05
4.3.100.0030.03011.05
4.3.90.0030.01711.05
4.3.80.0070.05011.05
4.3.70.0030.03011.05
4.3.60.0030.03311.05
4.3.50.0030.02311.05
4.3.40.0000.05311.05
4.3.30.0070.02011.05
4.3.20.0030.03311.05
4.3.10.0030.02311.05
4.3.00.0030.03011.05

preferences:
38.7 ms | 401 KiB | 5 Q