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, ","); } $cars=array("a","b","c"); sort($cars); print_r($cars); $cars=array("a","c","b"); sort($cars); print_r($cars); $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)
8.3.70.0150.00016.75
8.3.60.0000.01418.53
8.3.50.0220.00421.20
8.3.40.0120.00318.79
8.3.30.0090.00620.16
8.3.20.0040.00418.77
8.3.10.0050.00320.98
8.3.00.0090.00919.69
8.2.180.0180.00016.88
8.2.170.0080.00822.96
8.2.160.0070.00720.43
8.2.150.0060.00324.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0040.00420.02
8.2.110.0090.00022.25
8.2.100.0040.00817.82
8.2.90.0040.00419.22
8.2.80.0030.00519.21
8.2.70.0030.00517.75
8.2.60.0000.00818.16
8.2.50.0080.00018.07
8.2.40.0060.00318.28
8.2.30.0000.00821.22
8.2.20.0000.00717.67
8.2.10.0040.00417.71
8.2.00.0000.00817.78
8.1.280.0140.00025.92
8.1.270.0000.00823.99
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0060.00322.42
8.1.230.0040.00720.90
8.1.220.0060.00318.77
8.1.210.0080.00318.77
8.1.200.0040.00417.35
8.1.190.0040.00417.40
8.1.180.0000.00818.10
8.1.170.0040.00418.50
8.1.160.0040.00418.82
8.1.150.0080.00018.76
8.1.140.0070.00017.38
8.1.130.0070.00017.90
8.1.120.0040.00417.46
8.1.110.0040.00417.47
8.1.100.0040.00417.50
8.1.90.0000.00717.48
8.1.80.0030.00317.42
8.1.70.0000.00717.45
8.1.60.0030.00617.66
8.1.50.0040.00417.51
8.1.40.0000.00817.59
8.1.30.0040.00417.57
8.1.20.0050.00317.67
8.1.10.0030.00617.46
8.1.00.0050.00317.50
8.0.300.0000.00819.93
8.0.290.0000.00717.18
8.0.280.0000.00718.47
8.0.270.0030.00317.20
8.0.260.0030.00316.75
8.0.250.0030.00516.94
8.0.240.0060.00316.87
8.0.230.0030.00316.93
8.0.220.0030.00616.90
8.0.210.0070.00016.93
8.0.200.0000.00616.84
8.0.190.0030.00317.01
8.0.180.0030.00316.87
8.0.170.0040.00416.81
8.0.160.0050.00316.84
8.0.150.0000.00716.77
8.0.140.0030.00316.88
8.0.130.0050.00013.32
8.0.120.0030.00516.86
8.0.110.0000.00816.80
8.0.100.0040.00416.91
8.0.90.0040.00416.95
8.0.80.0130.01016.87
8.0.70.0020.00516.89
8.0.60.0040.00416.77
8.0.50.0000.00916.77
8.0.30.0080.01117.01
8.0.20.0120.00517.40
8.0.10.0040.00417.07
8.0.00.0150.02116.78
7.4.330.0000.00516.77
7.4.320.0050.00316.64
7.4.300.0030.00316.48
7.4.290.0040.00416.50
7.4.280.0030.00316.60
7.4.270.0030.00316.65
7.4.260.0000.00513.17
7.4.250.0000.00816.63
7.4.240.0040.00416.68
7.4.230.0030.00316.63
7.4.220.0120.00616.38
7.4.210.0100.00716.61
7.4.200.0030.00516.71
7.4.190.0020.00516.51
7.4.160.0100.00716.50
7.4.150.0030.01517.40
7.4.140.0100.01017.86
7.4.130.0100.01016.47
7.4.120.0050.01316.56
7.4.110.0090.00916.46
7.4.100.0090.01316.62
7.4.90.0110.00816.54
7.4.80.0080.00819.39
7.4.70.0150.00816.54
7.4.60.0100.00616.57
7.4.50.0000.00816.52
7.4.40.0060.00922.77
7.4.30.0160.00016.68
7.4.00.0090.00614.83
7.3.330.0050.00013.46
7.3.320.0000.00513.38
7.3.310.0030.00316.25
7.3.300.0000.00716.45
7.3.290.0070.00716.41
7.3.280.0070.00916.44
7.3.270.0070.01117.40
7.3.260.0130.00718.24
7.3.250.0120.00816.55
7.3.240.0090.00916.39
7.3.230.0030.02016.57
7.3.210.0190.00016.57
7.3.200.0140.00719.39
7.3.190.0120.00616.47
7.3.180.0100.00716.69
7.3.170.0060.00916.54
7.3.160.0100.00716.54
7.3.120.0000.01614.87
7.3.10.0000.01016.64
7.3.00.0040.00616.71
7.2.330.0000.01816.88
7.2.320.0100.00716.46
7.2.310.0130.01016.69
7.2.300.0030.01316.50
7.2.290.0130.00316.70
7.2.130.0080.00816.91
7.2.120.0000.01416.72
7.2.110.0050.00517.12
7.2.100.0080.00416.82
7.2.90.0030.01016.82
7.2.80.0080.00616.89
7.2.70.0050.00517.01
7.2.60.0000.01117.21
7.2.50.0040.00816.65
7.2.40.0070.00317.09
7.2.30.0060.00917.11
7.2.20.0080.00616.79
7.2.10.0030.00916.94
7.2.00.0040.00918.34
7.1.250.0000.00915.57
7.1.200.0150.00615.81
7.1.100.0100.00718.03
7.1.70.0000.01417.30
7.1.60.0130.01319.24
7.1.50.0100.01016.98
7.1.00.0030.05322.27
7.0.200.0030.00616.52
7.0.140.0130.06322.07
7.0.100.0130.07719.94
7.0.90.0230.06719.93
7.0.80.0070.06320.01
7.0.70.0230.06319.92
7.0.60.0170.08019.79
7.0.50.0130.04020.36
7.0.40.0100.08020.04
7.0.30.0100.03720.11
7.0.20.0030.08720.05
7.0.10.0070.08720.04
7.0.00.0100.05720.03
5.6.280.0070.07021.11
5.6.250.0100.08720.55
5.6.240.0030.06320.65
5.6.230.0030.04720.61
5.6.220.0100.07320.72
5.6.210.0030.08320.58
5.6.200.0100.05020.95
5.6.190.0070.08721.02
5.6.180.0100.04721.02
5.6.170.0030.08321.05
5.6.160.0130.06721.06
5.6.150.0070.04320.95
5.6.140.0170.06721.08
5.6.130.0000.08721.01
5.6.120.0130.08720.96
5.6.110.0100.07721.17
5.6.100.0130.08021.10
5.6.90.0030.05321.07
5.6.80.0000.08720.41
5.6.70.0070.05020.34
5.6.60.0130.08020.41
5.6.50.0100.08020.40
5.6.40.0030.06720.54
5.6.30.0100.07720.47
5.6.20.0130.07720.44
5.6.10.0130.07020.30
5.6.00.0100.05720.29
5.5.380.0130.07720.41
5.5.370.0100.07720.53
5.5.360.0070.08020.36
5.5.350.0070.04720.41
5.5.340.0100.08020.79
5.5.330.0130.07320.81
5.5.320.0230.07020.77
5.5.310.0030.05320.88
5.5.300.0000.08020.75
5.5.290.0100.05720.81
5.5.280.0170.07720.78
5.5.270.0100.04720.72
5.5.260.0100.08020.85
5.5.250.0030.05320.74
5.5.240.0070.05720.18
5.5.230.0000.08720.31
5.5.220.0030.08720.19
5.5.210.0070.07320.30
5.5.200.0100.07720.28
5.5.190.0030.04320.23
5.5.180.0100.08020.16
5.5.160.0100.08020.28
5.5.150.0070.08320.15
5.5.140.0100.07320.27
5.5.130.0130.07020.13
5.5.120.0170.06320.15
5.5.110.0070.08020.15
5.5.100.0070.08020.08
5.5.90.0070.07720.05
5.5.80.0100.03320.10
5.5.70.0030.08320.07
5.5.60.0070.07720.01
5.5.50.0000.06720.11
5.5.40.0070.07019.97
5.5.30.0030.05720.15
5.5.20.0030.08020.12
5.5.10.0070.07020.04
5.5.00.0070.04320.12
5.4.450.0100.07719.21
5.4.440.0100.07019.23
5.4.430.0130.07319.42
5.4.420.0130.05719.55
5.4.410.0170.05719.29
5.4.400.0030.08019.23
5.4.390.0030.08018.85
5.4.380.0070.07718.94
5.4.370.0030.06019.16
5.4.360.0100.07719.03
5.4.350.0030.08318.94
5.4.340.0030.06719.05
5.4.320.0100.07719.14
5.4.310.0100.05718.88
5.4.300.0000.06719.23
5.4.290.0070.07319.02
5.4.280.0100.06319.02
5.4.270.0130.07018.90
5.4.260.0070.07719.14
5.4.250.0130.05319.14
5.4.240.0070.06719.11
5.4.230.0070.04319.09
5.4.220.0070.04719.12
5.4.210.0130.07019.22
5.4.200.0030.08019.04
5.4.190.0000.06718.85
5.4.180.0070.05319.02
5.4.170.0070.06319.02
5.4.160.0070.04719.11
5.4.150.0030.06018.83
5.4.140.0070.07316.43
5.4.130.0130.06316.41
5.4.120.0030.08016.41
5.4.110.0100.04316.49
5.4.100.0100.07316.56
5.4.90.0030.04016.40
5.4.80.0000.06716.55
5.4.70.0030.06316.54
5.4.60.0130.06716.34
5.4.50.0130.07016.25
5.4.40.0130.06716.37
5.4.30.0030.06316.36
5.4.20.0170.05316.30
5.4.10.0130.06716.36
5.4.00.0100.06015.85
5.3.290.0130.07314.70
5.3.280.0070.04014.71
5.3.270.0030.08714.76
5.3.260.0100.07314.71
5.3.250.0170.04314.68
5.3.240.0070.07714.61
5.3.230.0170.05014.63
5.3.220.0070.03714.52
5.3.210.0070.06714.60
5.3.200.0070.04014.59
5.3.190.0130.06314.59
5.3.180.0100.07014.72
5.3.170.0070.05314.51
5.3.160.0070.06714.51
5.3.150.0100.07014.66
5.3.140.0030.06014.69
5.3.130.0130.06714.59
5.3.120.0030.06714.54
5.3.110.0070.06714.59
5.3.100.0030.06714.08
5.3.90.0100.07014.00
5.3.80.0070.04013.92
5.3.70.0030.08014.06
5.3.60.0000.06714.10
5.3.50.0030.04713.85
5.3.40.0100.06014.02
5.3.30.0000.07714.03
5.3.20.0130.05713.78
5.3.10.0070.03713.69
5.3.00.0070.06713.63
5.2.170.0100.06011.57
5.2.160.0030.06711.57
5.2.150.0070.04711.57
5.2.140.0030.04011.57
5.2.130.0030.06311.57
5.2.120.0000.03711.57
5.2.110.0000.03311.57
5.2.100.0030.06011.57
5.2.90.0030.06311.57
5.2.80.0030.04711.57
5.2.70.0100.05711.57
5.2.60.0030.06711.57
5.2.50.0070.06011.57
5.2.40.0070.05011.57
5.2.30.0030.06311.57
5.2.20.0000.03311.57
5.2.10.0000.05011.57
5.2.00.0030.05711.57
5.1.60.0100.05011.57
5.1.50.0070.02711.57
5.1.40.0000.04311.57
5.1.30.0030.06011.57
5.1.20.0000.05311.57
5.1.10.0070.02711.57
5.1.00.0030.05711.57
5.0.50.0030.04311.57
5.0.40.0100.03711.57
5.0.30.0030.06011.57
5.0.20.0030.04311.57
5.0.10.0070.04011.57
5.0.00.0070.05711.57
4.4.90.0030.03711.57
4.4.80.0030.02311.57
4.4.70.0030.01711.57
4.4.60.0070.03311.57
4.4.50.0100.03011.57
4.4.40.0000.03711.57
4.4.30.0030.03711.57
4.4.20.0130.01011.57
4.4.10.0030.02011.57
4.4.00.0030.05311.57
4.3.110.0100.02711.57
4.3.100.0030.03311.57
4.3.90.0100.01311.57
4.3.80.0070.04311.57
4.3.70.0030.03011.57
4.3.60.0000.03311.57
4.3.50.0070.02711.57
4.3.40.0000.04711.57
4.3.30.0030.03711.57
4.3.20.0000.03311.57
4.3.10.0000.03311.57
4.3.00.0000.03711.57

preferences:
217.94 ms | 401 KiB | 5 Q