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); } $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, $i); print_r(array_unique($r, SORT_REGULAR));

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)
8.3.40.0110.00418.83
8.3.30.0100.00320.03
8.3.20.0130.00618.76
8.3.10.0050.00321.17
8.3.00.0080.00023.64
8.2.170.0160.00622.96
8.2.160.0070.00720.52
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0000.00826.16
8.2.120.0070.00020.02
8.2.110.0100.00020.35
8.2.100.0060.00617.66
8.2.90.0000.00819.22
8.2.80.0060.00319.46
8.2.70.0040.00817.63
8.2.60.0000.00817.80
8.2.50.0090.00018.07
8.2.40.0000.00718.22
8.2.30.0040.00419.44
8.2.20.0040.00417.61
8.2.10.0080.00017.77
8.2.00.0000.01017.68
8.1.270.0040.00423.99
8.1.260.0040.00426.35
8.1.250.0140.00028.09
8.1.240.0070.01022.43
8.1.230.0030.00720.88
8.1.220.0050.00318.77
8.1.210.0000.00818.80
8.1.200.0040.00417.10
8.1.190.0040.00417.51
8.1.180.0090.00018.10
8.1.170.0000.00818.44
8.1.160.0070.00018.94
8.1.150.0040.00418.51
8.1.140.0030.00517.41
8.1.130.0070.00017.88
8.1.120.0030.00317.44
8.1.110.0050.00217.48
8.1.100.0080.00017.48
8.1.90.0030.00417.50
8.1.80.0000.00717.43
8.1.70.0050.00217.43
8.1.60.0090.00017.54
8.1.50.0070.00017.36
8.1.40.0080.00017.41
8.1.30.0080.00017.65
8.1.20.0000.00817.64
8.1.10.0000.00817.47
8.1.00.0040.00717.55
8.0.300.0000.00720.03
8.0.290.0000.00716.93
8.0.280.0040.00418.50
8.0.270.0030.00317.26
8.0.260.0070.00016.82
8.0.250.0040.00417.03
8.0.240.0040.00416.97
8.0.230.0030.00316.92
8.0.220.0000.00716.84
8.0.210.0030.00316.86
8.0.200.0000.00616.97
8.0.190.0000.00716.98
8.0.180.0000.00816.92
8.0.170.0050.00316.89
8.0.160.0030.00316.88
8.0.150.0040.00416.93
8.0.140.0070.00016.89
8.0.130.0000.00513.26
8.0.120.0080.00016.77
8.0.110.0000.00716.76
8.0.100.0050.00217.00
8.0.90.0020.00516.77
8.0.80.0030.01316.82
8.0.70.0080.00016.91
8.0.60.0050.00216.78
8.0.50.0070.00016.86
8.0.30.0120.00617.18
8.0.20.0110.00817.40
8.0.10.0070.00016.84
8.0.00.0070.01116.78
7.4.330.0050.00016.66
7.4.320.0030.00316.63
7.4.300.0000.00716.57
7.4.290.0000.00716.55
7.4.280.0000.00716.54
7.4.270.0040.00416.53
7.4.260.0000.00513.29
7.4.250.0040.00416.47
7.4.240.0040.00316.61
7.4.230.0030.00316.60
7.4.220.0030.01316.44
7.4.210.0100.00516.58
7.4.200.0070.00016.31
7.4.190.0030.00316.55
7.4.160.0070.01116.25
7.4.150.0140.00417.40
7.4.140.0110.00817.86
7.4.130.0050.01316.48
7.4.120.0060.01216.44
7.4.110.0080.00816.68
7.4.100.0120.00416.62
7.4.90.0110.01116.33
7.4.80.0130.00719.39
7.4.70.0100.01416.62
7.4.60.0030.01316.64
7.4.50.0000.00816.39
7.4.40.0000.01322.77
7.4.30.0030.01316.37
7.4.00.0040.01214.96
7.3.330.0000.00513.39
7.3.320.0030.00313.30
7.3.310.0030.00316.39
7.3.300.0000.00716.36
7.3.290.0110.00316.39
7.3.280.0090.00616.35
7.3.270.0180.00617.40
7.3.260.0140.00518.24
7.3.250.0120.00816.52
7.3.240.0070.01016.68
7.3.230.0070.01016.57
7.3.210.0090.01216.38
7.3.200.0030.01419.39
7.3.190.0070.01016.61
7.3.180.0100.00616.66
7.3.170.0100.01016.59
7.3.160.0060.01016.77
7.3.120.0110.00314.78
7.3.110.0080.00514.61
7.3.100.0030.01015.16
7.3.90.0090.00614.77
7.3.80.0030.00514.66
7.3.70.0000.01414.81
7.3.60.0040.00414.77
7.3.50.0110.00415.02
7.3.40.0100.00314.97
7.3.30.0030.00514.71
7.3.20.0030.01016.74
7.3.10.0070.01016.61
7.3.00.0030.00616.76
7.2.330.0140.00316.52
7.2.320.0120.00616.83
7.2.310.0070.01416.86
7.2.300.0070.01516.68
7.2.290.0100.00716.81
7.2.240.0090.00914.99
7.2.230.0080.00415.16
7.2.220.0090.00315.04
7.2.210.0000.00815.21
7.2.200.0040.00715.02
7.2.190.0030.01015.23
7.2.180.0060.01015.19
7.2.170.0000.00915.21
7.2.160.0070.00715.19
7.2.150.0080.00417.04
7.2.140.0030.01016.84
7.2.130.0030.00616.79
7.2.120.0110.00417.11
7.2.110.0000.00916.91
7.2.100.0000.01516.99
7.2.90.0040.01117.05
7.2.80.0040.00816.81
7.2.70.0030.01316.88
7.2.60.0080.00516.75
7.2.50.0040.01117.04
7.2.40.0050.00516.88
7.2.30.0090.00617.02
7.2.20.0060.00317.07
7.2.10.0030.01016.91
7.2.00.0060.00518.18
7.1.330.0040.01215.86
7.1.320.0030.01315.92
7.1.310.0060.00615.96
7.1.300.0100.00315.92
7.1.290.0100.00315.85
7.1.280.0070.00715.67
7.1.270.0090.00015.92
7.1.260.0110.00315.89
7.1.250.0040.00415.84
7.1.200.0060.00815.91
7.1.100.0070.00318.24
7.1.70.0000.00717.11
7.1.60.0170.00719.24
7.1.50.0060.01016.55
7.1.00.0030.03722.36
7.0.200.0030.00516.92
7.0.140.0030.06721.90
7.0.100.0100.08020.04
7.0.90.0100.04320.16
7.0.80.0170.04019.98
7.0.70.0030.04020.01
7.0.60.0100.07319.99
7.0.50.0030.08020.33
7.0.40.0030.04320.02
7.0.30.0070.05720.16
7.0.20.0030.04320.09
7.0.10.0030.06720.02
7.0.00.0100.04320.12
5.6.280.0000.07721.12
5.6.250.0000.06320.71
5.6.240.0030.08020.70
5.6.230.0100.05320.57
5.6.220.0030.07720.53
5.6.210.0070.07020.75
5.6.200.0070.03721.07
5.6.190.0030.03721.11
5.6.180.0100.03721.16
5.6.170.0130.03021.05
5.6.160.0030.05721.08
5.6.150.0000.05321.06
5.6.140.0000.05020.93
5.6.130.0000.04321.00
5.6.120.0030.04320.93
5.6.110.0070.07021.02
5.6.100.0000.05721.03
5.6.90.0070.06721.08
5.6.80.0000.05720.40
5.6.70.0000.04320.39
5.6.60.0100.07720.48
5.6.50.0000.05720.38
5.6.40.0170.07020.31
5.6.30.0130.02720.31
5.6.20.0030.08020.39
5.6.10.0030.05320.36
5.6.00.0030.03720.36
5.5.380.0000.04720.40
5.5.370.0100.07020.43
5.5.360.0000.08720.46
5.5.350.0100.05320.36
5.5.340.0100.06320.83
5.5.330.0030.05720.86
5.5.320.0000.07020.82
5.5.310.0130.05720.80
5.5.300.0000.04020.86
5.5.290.0100.05720.72
5.5.280.0030.04720.89
5.5.270.0000.05320.86
5.5.260.0030.04020.74
5.5.250.0100.05020.54
5.5.240.0100.04020.28
5.5.230.0030.04320.20
5.5.220.0070.03320.25
5.5.210.0100.07720.14
5.5.200.0000.04020.17
5.5.190.0100.05020.23
5.5.180.0070.03720.14
5.5.160.0030.07720.26
5.5.150.0000.03719.99
5.5.140.0100.06320.21
5.5.130.0070.05020.24
5.5.120.0170.06720.08
5.5.110.0170.06720.19
5.5.100.0070.03019.95
5.5.90.0100.03020.12
5.5.80.0030.04720.16
5.5.70.0030.03720.05
5.5.60.0070.07720.05
5.5.50.0100.07020.05
5.5.40.0030.03720.05
5.5.30.0070.03320.08
5.5.20.0030.06020.07
5.5.10.0030.08019.99
5.5.00.0100.07719.95
5.4.450.0030.07719.57
5.4.440.0070.03319.56
5.4.430.0070.06719.45
5.4.420.0130.07019.46
5.4.410.0030.05719.29
5.4.400.0100.06019.13
5.4.390.0000.04019.07
5.4.380.0170.06719.18
5.4.370.0070.07319.09
5.4.360.0030.03719.13
5.4.350.0070.07718.85
5.4.340.0000.08319.14
5.4.320.0070.07719.23
5.4.310.0130.06319.16
5.4.300.0070.04019.02
5.4.290.0070.08019.09
5.4.280.0130.06319.18
5.4.270.0100.05318.90
5.4.260.0130.06718.90
5.4.250.0030.04719.04
5.4.240.0130.02719.03
5.4.230.0100.07019.04
5.4.220.0030.07719.13
5.4.210.0070.03019.12
5.4.200.0030.07718.86
5.4.190.0100.04319.17
5.4.180.0000.07319.21
5.4.170.0030.05318.91
5.4.160.0070.06019.21
5.4.150.0070.05319.21
5.4.140.0100.07316.40
5.4.130.0070.05016.32
5.4.120.0030.07016.44
5.4.110.0030.06716.45
5.4.100.0030.05716.44
5.4.90.0100.06716.57
5.4.80.0170.06316.38
5.4.70.0000.06716.46
5.4.60.0070.03316.42
5.4.50.0000.04716.48
5.4.40.0000.07316.35
5.4.30.0030.04716.34
5.4.20.0100.06316.32
5.4.10.0030.05016.46
5.4.00.0030.07315.63
5.3.290.0070.07314.63
5.3.280.0030.03714.53
5.3.270.0030.03314.68
5.3.260.0030.03714.72
5.3.250.0070.03014.59
5.3.240.0030.04714.62
5.3.230.0070.06314.61
5.3.220.0030.03014.72
5.3.210.0070.05314.61
5.3.200.0030.07014.71
5.3.190.0100.05314.71
5.3.180.0000.03714.56
5.3.170.0070.06314.63
5.3.160.0030.04714.59
5.3.150.0100.02714.63
5.3.140.0000.03714.53
5.3.130.0100.05714.50
5.3.120.0070.04314.55
5.3.110.0100.05314.57
5.3.100.0070.06314.00
5.3.90.0030.03714.04
5.3.80.0100.07013.95
5.3.70.0100.02713.93
5.3.60.0100.06714.13
5.3.50.0070.03714.00
5.3.40.0100.07313.89
5.3.30.0000.08014.03
5.3.20.0000.06313.63
5.3.10.0030.03713.80
5.3.00.0170.05713.68
5.2.170.0030.06011.29
5.2.160.0030.02311.27
5.2.150.0070.06011.08
5.2.140.0030.03711.27
5.2.130.0030.03011.21
5.2.120.0100.05710.96
5.2.110.0000.05311.04
5.2.100.0030.02311.10
5.2.90.0070.05311.14
5.2.80.0000.02711.16
5.2.70.0030.05010.98
5.2.60.0030.06010.99
5.2.50.0000.05710.94
5.2.40.0070.04710.89
5.2.30.0070.05710.87
5.2.20.0030.03710.95
5.2.10.0000.06310.86
5.2.00.0100.02010.59
5.1.60.0030.04310.07
5.1.50.0100.04710.08
5.1.40.0000.0239.82
5.1.30.0070.05710.48
5.1.20.0070.04710.50
5.1.10.0070.02710.16
5.1.00.0070.03010.18
5.0.50.0030.0408.59
5.0.40.0000.0408.59
5.0.30.0030.0278.59
5.0.20.0070.0138.59
5.0.10.0000.0338.59
5.0.00.0000.0508.59
4.4.90.0030.0338.59
4.4.80.0000.0138.59
4.4.70.0030.0108.59
4.4.60.0070.0078.59
4.4.50.0000.0338.59
4.4.40.0030.0208.59
4.4.30.0030.0178.59
4.4.20.0000.0408.59
4.4.10.0030.0308.59
4.4.00.0030.0438.59
4.3.110.0030.0338.59
4.3.100.0030.0308.59
4.3.90.0030.0278.59
4.3.80.0070.0508.59
4.3.70.0030.0108.59
4.3.60.0030.0238.59
4.3.50.0030.0138.59
4.3.40.0030.0378.59
4.3.30.0030.0138.59
4.3.20.0000.0378.59
4.3.10.0000.0238.59
4.3.00.0000.0308.59

preferences:
40 ms | 400 KiB | 5 Q