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 $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)
8.3.70.0140.00716.36
8.3.60.0100.00716.63
8.3.50.0120.00516.30
8.3.40.0130.00318.92
8.3.30.0120.00318.74
8.3.20.0040.00418.71
8.3.10.0040.00418.69
8.3.00.0000.00819.38
8.2.180.0100.00718.05
8.2.170.0150.00622.96
8.2.160.0120.00318.64
8.2.150.0060.00324.18
8.2.140.0080.00024.66
8.2.130.0000.00726.16
8.2.120.0100.00019.41
8.2.110.0060.00320.56
8.2.100.0040.00717.91
8.2.90.0030.00517.71
8.2.80.0050.00518.82
8.2.70.0060.00317.75
8.2.60.0000.00818.03
8.2.50.0030.00618.07
8.2.40.0040.00419.48
8.2.30.0060.00317.67
8.2.20.0050.00517.74
8.2.10.0000.00717.72
8.2.00.0000.00917.80
8.1.280.0120.00625.92
8.1.270.0040.00423.99
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0140.00323.92
8.1.230.0080.00420.93
8.1.220.0050.00317.79
8.1.210.0050.00318.77
8.1.200.0060.00317.35
8.1.190.0030.00717.23
8.1.180.0040.00418.10
8.1.170.0000.00818.88
8.1.160.0070.00318.92
8.1.150.0000.00918.62
8.1.140.0040.00417.36
8.1.130.0040.00419.18
8.1.120.0030.00417.48
8.1.110.0030.00617.44
8.1.100.0030.00317.50
8.1.90.0000.00717.45
8.1.80.0000.00817.43
8.1.70.0000.00717.44
8.1.60.0000.00717.57
8.1.50.0080.00017.35
8.1.40.0030.00517.40
8.1.30.0030.00617.63
8.1.20.0090.00317.55
8.1.10.0040.00417.45
8.1.00.0040.00417.33
8.0.300.0040.00418.93
8.0.290.0060.00316.75
8.0.280.0060.00318.48
8.0.270.0070.00017.31
8.0.260.0030.00316.82
8.0.250.0030.00616.98
8.0.240.0040.00416.86
8.0.230.0050.00216.94
8.0.220.0040.00416.95
8.0.210.0040.00416.88
8.0.200.0040.00416.83
8.0.190.0030.00617.02
8.0.180.0040.00416.82
8.0.170.0040.00416.92
8.0.160.0040.00416.82
8.0.150.0000.00816.74
8.0.140.0030.00616.83
8.0.130.0000.00613.33
8.0.120.0050.00616.72
8.0.110.0080.00016.91
8.0.100.0070.00016.89
8.0.90.0000.00816.88
8.0.80.0040.01816.90
8.0.70.0040.00416.73
8.0.60.0000.00916.75
8.0.50.0000.00816.78
8.0.30.0100.01016.91
8.0.20.0100.01117.18
8.0.10.0040.00417.13
8.0.00.0100.00916.79
7.4.330.0030.00313.06
7.4.320.0030.00316.57
7.4.300.0030.00316.52
7.4.290.0030.00316.55
7.4.280.0080.00016.60
7.4.270.0070.00016.45
7.4.260.0000.00613.27
7.4.250.0090.00016.51
7.4.240.0000.00816.36
7.4.230.0070.00016.59
7.4.220.0170.00916.55
7.4.210.0070.01016.61
7.4.200.0030.00316.41
7.4.190.0040.00416.46
7.4.160.0080.00816.50
7.4.150.0140.00516.47
7.4.140.0070.01117.86
7.4.130.0070.01016.47
7.4.120.0070.01016.41
7.4.110.0100.01016.47
7.4.100.0090.00916.50
7.4.90.0060.01216.48
7.4.80.0210.00919.39
7.4.70.0110.00816.63
7.4.60.0060.01316.52
7.4.50.0000.00716.60
7.4.40.0150.00416.25
7.4.30.0080.00816.45
7.4.00.0150.00014.89
7.3.330.0000.00613.15
7.3.320.0030.00313.31
7.3.310.0030.00316.37
7.3.300.0000.00616.23
7.3.290.0060.00916.37
7.3.280.0100.00316.32
7.3.270.0040.01316.58
7.3.260.0170.00016.40
7.3.240.0030.01216.37
7.3.230.0140.00316.23
7.3.210.0120.00616.41
7.3.200.0090.00916.30
7.3.190.0090.00616.46
7.3.180.0060.01016.60
7.3.170.0060.01816.33
7.3.160.0080.00816.44
7.3.120.0130.00314.28
7.3.110.0110.00414.96
7.3.100.0090.00614.66
7.3.90.0070.00714.73
7.3.80.0070.01014.86
7.3.70.0060.01014.51
7.3.60.0090.00614.55
7.3.50.0090.00314.70
7.3.40.0070.00714.63
7.3.30.0100.00614.91
7.3.20.0030.00816.48
7.3.10.0040.01216.75
7.3.00.0110.00616.45
7.2.330.0140.00416.75
7.2.320.0040.01416.65
7.2.310.0130.01016.80
7.2.300.0070.01016.50
7.2.290.0190.00616.85
7.2.240.0090.00314.70
7.2.230.0060.00914.97
7.2.220.0040.00815.09
7.2.210.0030.01314.79
7.2.200.0070.00414.96
7.2.190.0100.00715.23
7.2.180.0070.01015.13
7.2.170.0040.01114.95
7.2.160.0000.01614.71
7.2.150.0100.00716.93
7.2.140.0100.00316.58
7.2.130.0030.01016.62
7.2.120.0090.00916.83
7.2.110.0120.00316.89
7.2.100.0090.00616.93
7.2.90.0060.00916.94
7.2.80.0060.00616.79
7.2.70.0070.00717.00
7.2.60.0000.01516.91
7.2.50.0000.01316.60
7.2.40.0030.01316.98
7.2.30.0060.00916.88
7.2.20.0080.00316.81
7.2.10.0060.00916.84
7.2.00.0010.01318.12
7.1.330.0040.01215.77
7.1.320.0070.01015.64
7.1.310.0100.00315.90
7.1.300.0090.00615.46
7.1.290.0070.01015.83
7.1.280.0030.01415.70
7.1.270.0060.00615.76
7.1.260.0090.00615.24
7.1.250.0100.00715.59
7.1.100.0000.00818.42
7.1.70.0030.00917.01
7.1.60.0070.00317.19
7.1.50.0100.01316.74
7.1.00.0100.06722.48
7.0.200.0060.01016.79
7.0.140.0030.07322.09
7.0.120.0030.07022.13
7.0.60.0100.07719.91
7.0.50.0030.08717.72
7.0.40.0030.05317.77
7.0.30.0070.05017.80
7.0.20.0100.07717.84
7.0.10.0100.08317.81
7.0.00.0070.06317.75
5.6.280.0000.07720.91
5.6.210.0130.07720.62
5.6.200.0070.05318.18
5.6.190.0030.05318.20
5.6.180.0070.08018.14
5.6.170.0070.08718.28
5.6.160.0100.05318.15
5.6.150.0200.03318.26
5.6.140.0100.03318.14
5.6.130.0030.04318.18
5.6.120.0070.04718.17
5.6.110.0200.07318.18
5.6.100.0030.08318.16
5.6.90.0100.07718.21
5.6.80.0100.07717.68
5.6.70.0000.05017.56
5.6.60.0170.07017.55
5.6.50.0170.07017.57
5.6.40.0000.06017.52
5.6.30.0100.03317.50
5.6.20.0100.03017.47
5.6.10.0000.04017.63
5.6.00.0100.03017.50
5.5.350.0270.07320.50
5.5.340.0000.05317.99
5.5.330.0030.05017.98
5.5.320.0070.07018.04
5.5.310.0100.07018.02
5.5.300.0100.03317.95
5.5.290.0030.08317.98
5.5.280.0130.07318.07
5.5.270.0030.08717.98
5.5.260.0070.07717.98
5.5.250.0000.04317.86
5.5.240.0070.03317.38
5.5.230.0000.08317.32
5.5.220.0030.04717.33
5.5.210.0030.04017.47
5.5.200.0030.07317.37
5.5.190.0030.04017.30
5.5.180.0130.03317.31
5.5.160.0070.03317.32
5.5.150.0100.03017.33
5.5.140.0100.03017.39
5.5.130.0000.05017.33
5.5.120.0070.04017.40
5.5.110.0130.03017.41
5.5.100.0000.04017.23
5.5.90.0000.04017.26
5.5.80.0000.04017.32
5.5.70.0030.03717.21
5.5.60.0030.03717.17
5.5.50.0130.03717.19
5.5.40.0070.03317.32
5.5.30.0030.03717.34
5.5.20.0030.03717.21
5.5.10.0030.04017.34
5.5.00.0070.03317.22
5.4.450.0030.04019.39
5.4.440.0130.05719.36
5.4.430.0130.07019.37
5.4.420.0030.05019.31
5.4.410.0000.04319.15
5.4.400.0100.07019.05
5.4.390.0070.07719.06
5.4.380.0130.04319.07
5.4.370.0130.03718.89
5.4.360.0100.07719.05
5.4.350.0030.04018.89
5.4.340.0070.03318.98
5.4.320.0000.04019.05
5.4.310.0030.03719.05
5.4.300.0030.04019.00
5.4.290.0070.03318.97
5.4.280.0070.03319.05
5.4.270.0000.04019.09
5.4.260.0000.04718.89
5.4.250.0070.03319.09
5.4.240.0000.04019.26
5.4.230.0030.03719.09
5.4.220.0030.03719.13
5.4.210.0030.03719.01
5.4.200.0100.03019.09
5.4.190.0070.03319.00
5.4.180.0000.04019.11
5.4.170.0000.04019.04
5.4.160.0070.03319.02
5.4.150.0030.03719.25
5.4.140.0030.04316.63
5.4.130.0100.03716.45
5.4.120.0100.06316.37
5.4.110.0070.07316.50
5.4.100.0200.06316.53
5.4.90.0100.05016.53
5.4.80.0070.05316.48
5.4.70.0070.06016.41
5.4.60.0030.06016.45
5.4.50.0130.06716.52
5.4.40.0170.05016.36
5.4.30.0100.05016.52
5.4.20.0100.04316.52
5.4.10.0130.04016.52
5.4.00.0030.04715.77
5.3.290.0030.03714.71
5.3.280.0000.04014.63
5.3.270.0070.03314.63
5.3.260.0000.04014.66
5.3.250.0030.03714.66
5.3.240.0070.08014.71
5.3.230.0100.04714.66
5.3.220.0070.07014.67
5.3.210.0100.07314.60
5.3.200.0100.04714.64
5.3.190.0070.05714.54
5.3.180.0070.07314.79
5.3.170.0030.04014.42
5.3.160.0070.04714.42
5.3.150.0030.07714.62
5.3.140.0030.08014.57
5.3.130.0100.03714.77
5.3.120.0030.06314.61
5.3.110.0130.07014.60
5.3.100.0070.07714.12
5.3.90.0130.06313.87
5.3.80.0030.07713.91
5.3.70.0100.06314.04
5.3.60.0030.04713.90
5.3.50.0070.03314.01
5.3.40.0070.05713.97
5.3.30.0100.06713.92
5.3.20.0100.03013.71
5.3.10.0000.08013.75
5.3.00.0070.04713.63
5.2.170.0070.06311.05
5.2.160.0030.06011.20
5.2.150.0030.03311.14
5.2.140.0100.03011.00
5.2.130.0000.03711.13
5.2.120.0130.02711.00
5.2.110.0030.06010.96
5.2.100.0030.06011.13
5.2.90.0100.05311.14
5.2.80.0030.03311.11
5.2.70.0100.03711.09
5.2.60.0100.05711.11
5.2.50.0030.06711.05
5.2.40.0070.06311.10
5.2.30.0000.05011.02
5.2.20.0070.06011.04
5.2.10.0030.06010.89
5.2.00.0100.05710.57
5.1.60.0100.05010.00
5.1.50.0030.05710.08
5.1.40.0070.0539.96
5.1.30.0070.05710.19
5.1.20.0070.05310.39
5.1.10.0030.02710.04
5.1.00.0100.05010.18
5.0.50.0030.0508.55
5.0.40.0070.0238.38
5.0.30.0030.0638.22
5.0.20.0000.0238.29
5.0.10.0000.0478.40
5.0.00.0100.0578.38
4.4.90.0070.0307.68
4.4.80.0070.0337.68
4.4.70.0000.0407.68
4.4.60.0000.0337.68
4.4.50.0030.0337.68
4.4.40.0070.0277.68
4.4.30.0030.0237.68
4.4.20.0000.0207.68
4.4.10.0100.0237.68
4.4.00.0030.0537.68
4.3.110.0000.0307.68
4.3.100.0070.0237.68
4.3.90.0100.0237.68
4.3.80.0000.0337.68
4.3.70.0000.0237.68
4.3.60.0000.0337.68
4.3.50.0070.0307.68
4.3.40.0000.0507.68
4.3.30.0000.0337.68
4.3.20.0000.0377.68
4.3.10.0000.0377.68
4.3.00.0030.0207.68

preferences:
56.39 ms | 401 KiB | 5 Q