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; } $letters = 'abcd'; echo '2 letters from 4:<br/>'; for($i = 0; $i < getPermCount($letters, 2); $i++) echo getPerm($letters, 2, $i).' '; echo '<br>3 letters from 4:\n'; for($i = 0; $i < getPermCount($letters, 3); $i++) echo getPerm($letters, 3, $i). " ";

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)
8.3.60.0070.01418.29
8.3.50.0160.00321.14
8.3.40.0070.01118.80
8.3.30.0110.00420.20
8.3.20.0000.00818.76
8.3.10.0080.00021.09
8.3.00.0080.00019.80
8.2.180.0110.00716.88
8.2.170.0060.00922.96
8.2.160.0070.00720.29
8.2.150.0080.00024.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0070.00019.77
8.2.110.0060.00322.02
8.2.100.0120.00017.91
8.2.90.0080.00519.24
8.2.80.0060.00319.40
8.2.70.0090.00017.63
8.2.60.0000.00818.05
8.2.50.0080.00418.07
8.2.40.0030.00620.13
8.2.30.0030.00319.39
8.2.20.0040.00417.65
8.2.10.0060.00317.83
8.2.00.0000.01017.57
8.1.280.0180.00625.92
8.1.270.0030.00523.99
8.1.260.0000.00826.35
8.1.250.0050.00228.09
8.1.240.0090.00023.89
8.1.230.0030.00919.01
8.1.220.0050.00317.74
8.1.210.0000.00818.77
8.1.200.0030.00617.35
8.1.190.0000.00817.51
8.1.180.0000.00918.10
8.1.170.0000.00918.59
8.1.160.0040.00418.90
8.1.150.0040.00418.71
8.1.140.0000.00817.42
8.1.130.0000.00719.19
8.1.120.0030.00617.41
8.1.110.0000.00717.46
8.1.100.0030.00617.48
8.1.90.0000.00817.48
8.1.80.0000.00717.54
8.1.70.0070.00017.38
8.1.60.0000.00817.55
8.1.50.0000.00817.45
8.1.40.0050.00317.41
8.1.30.0070.00017.59
8.1.20.0050.00317.53
8.1.10.0040.00417.55
8.1.00.0040.00417.52
8.0.300.0070.00021.94
8.0.290.0000.00817.18
8.0.280.0030.00318.42
8.0.270.0070.00017.27
8.0.260.0050.00316.82
8.0.250.0040.00417.00
8.0.240.0050.00317.01
8.0.230.0030.00316.93
8.0.220.0000.00716.88
8.0.210.0000.00716.76
8.0.200.0030.00317.04
8.0.190.0040.00416.98
8.0.180.0070.00016.82
8.0.170.0040.00416.86
8.0.160.0000.00717.04
8.0.150.0040.00416.78
8.0.140.0070.00016.82
8.0.130.0000.00613.33
8.0.120.0040.00416.74
8.0.110.0000.00716.95
8.0.100.0070.00016.70
8.0.90.0000.00716.75
8.0.80.0130.00916.85
8.0.70.0000.00816.88
8.0.60.0000.00816.79
8.0.50.0000.00816.80
8.0.30.0110.00917.25
8.0.20.0110.01017.40
8.0.10.0040.00417.06
8.0.00.0090.01316.65
7.4.330.0020.00216.71
7.4.320.0030.00316.66
7.4.300.0020.00516.61
7.4.290.0030.00316.54
7.4.280.0040.00416.53
7.4.270.0080.00016.52
7.4.260.0060.00313.27
7.4.250.0000.00716.40
7.4.240.0080.00016.55
7.4.230.0000.00716.71
7.4.220.0170.01016.50
7.4.210.0040.01016.55
7.4.200.0070.00016.69
7.4.190.0000.00716.42
7.4.160.0130.00616.53
7.4.150.0090.00917.40
7.4.140.0100.00717.86
7.4.130.0120.00816.62
7.4.120.0110.00716.54
7.4.110.0160.00316.47
7.4.100.0140.00416.49
7.4.90.0180.00616.46
7.4.80.0100.01319.39
7.4.70.0100.00616.50
7.4.60.0120.00516.47
7.4.50.0030.00616.63
7.4.40.0030.01022.77
7.4.30.0100.01016.40
7.4.10.0120.00614.89
7.4.00.0100.00614.99
7.3.330.0050.00013.38
7.3.320.0000.00513.26
7.3.310.0020.00516.27
7.3.300.0070.00016.23
7.3.290.0140.00016.40
7.3.280.0090.01016.37
7.3.270.0000.01817.40
7.3.260.0110.00818.24
7.3.250.0060.01416.46
7.3.240.0120.00416.42
7.3.230.0060.01116.62
7.3.210.0130.00516.63
7.3.200.0040.01619.39
7.3.190.0160.00616.52
7.3.180.0090.01216.65
7.3.170.0100.00716.55
7.3.160.0030.01316.55
7.3.130.0140.00314.90
7.3.120.0080.00714.96
7.3.110.0000.01914.94
7.3.100.0070.01014.83
7.3.90.0060.00914.70
7.3.80.0000.01614.77
7.3.70.0060.00614.68
7.3.60.0130.00314.97
7.3.50.0030.01514.79
7.3.40.0090.00314.77
7.3.30.0090.00614.53
7.3.20.0090.00616.68
7.3.10.0040.00716.91
7.3.00.0050.01016.60
7.2.330.0090.00916.48
7.2.320.0120.00916.68
7.2.310.0110.00816.45
7.2.300.0000.01616.51
7.2.290.0060.01016.82
7.2.260.0090.00915.36
7.2.250.0000.01215.23
7.2.240.0000.01314.93
7.2.230.0070.01015.04
7.2.220.0090.00614.73
7.2.210.0100.00714.89
7.2.200.0120.00415.10
7.2.190.0070.01015.20
7.2.180.0060.01215.09
7.2.170.0040.00815.14
7.2.160.0080.00415.03
7.2.150.0030.01317.00
7.2.140.0120.00016.79
7.2.130.0070.00516.96
7.2.120.0070.00716.80
7.2.110.0060.00916.87
7.2.100.0060.00516.91
7.2.90.0100.00716.83
7.2.80.0040.01417.00
7.2.70.0090.00916.80
7.2.60.0090.01016.92
7.2.50.0050.01216.90
7.2.40.0050.01017.03
7.2.30.0050.01217.03
7.2.20.0030.01017.01
7.2.10.0090.00816.73
7.2.00.0030.01117.83
7.1.330.0040.01115.86
7.1.320.0070.00715.99
7.1.310.0000.00915.54
7.1.300.0110.00715.85
7.1.290.0120.00615.61
7.1.280.0000.00815.76
7.1.270.0110.00415.84
7.1.260.0040.00815.48
7.1.250.0070.00515.89
7.1.240.0050.00915.78
7.1.230.0090.00515.76
7.1.220.0080.00615.84
7.1.210.0050.01015.76
7.1.200.0060.00715.64
7.1.190.0080.00615.89
7.1.180.0030.00915.85
7.1.170.0060.00915.90
7.1.160.0050.01015.57
7.1.150.0030.01015.76
7.1.140.0060.00615.84
7.1.130.0110.00315.74
7.1.120.0090.00415.89
7.1.110.0050.00715.78
7.1.100.0040.00816.64
7.1.90.0060.00715.88
7.1.80.0030.01315.77
7.1.70.0050.00916.33
7.1.60.0070.00816.27
7.1.50.0040.01116.29
7.1.40.0050.00616.12
7.1.30.0040.00716.07
7.1.20.0070.00616.10
7.1.10.0070.00716.15
7.1.00.0060.00516.23
7.0.330.0040.00515.44
7.0.320.0030.01015.30
7.0.310.0020.00915.48
7.0.300.0070.00515.42
7.0.290.0050.00415.45
7.0.280.0090.00715.51
7.0.270.0050.01015.27
7.0.260.0090.00615.41
7.0.250.0060.00915.53
7.0.240.0060.00815.52
7.0.230.0060.00715.37
7.0.220.0080.00015.48
7.0.210.0030.00615.45
7.0.200.0050.00915.83
7.0.190.0050.00915.89
7.0.180.0040.00815.83
7.0.170.0060.00515.93
7.0.160.0050.00515.92
7.0.150.0050.00615.85
7.0.140.0040.00915.80
7.0.130.0020.00815.97
7.0.120.0060.00715.91
7.0.110.0050.00515.75
7.0.100.0020.00815.92
7.0.90.0040.00915.88
7.0.80.0050.00515.90
7.0.70.0040.00515.91
7.0.60.0050.00515.85
7.0.50.0050.00715.98
7.0.40.0010.00914.66
7.0.30.0030.00914.59
7.0.20.0020.00814.57
7.0.10.0070.00614.62
7.0.00.0030.00814.60
5.6.400.0030.00714.62
5.6.390.0000.01314.08
5.6.380.0090.00314.29
5.6.370.0080.00514.69
5.6.360.0020.01414.45
5.6.350.0060.00714.42
5.6.340.0080.00514.23
5.6.330.0060.00714.23
5.6.320.0070.00914.28
5.6.310.0050.00914.15
5.6.300.0060.02016.63
5.6.290.0080.01616.32
5.6.280.0030.02216.73
5.6.270.0050.01816.63
5.6.260.0070.01716.59
5.6.250.0020.02116.54
5.6.240.0100.01416.55
5.6.230.0050.01816.63
5.6.220.0050.01816.39
5.6.210.0070.01716.54
5.6.200.0150.01316.55
5.6.190.0040.02216.51
5.6.180.0050.02016.60
5.6.170.0050.01916.51
5.6.160.0050.01716.49
5.6.150.0040.02316.50
5.6.140.0090.01816.47
5.6.130.0040.02016.55
5.6.120.0050.01816.53
5.6.110.0040.02316.39
5.6.100.0120.01716.49
5.6.90.0070.02116.57
5.6.80.0060.01716.29
5.6.70.0070.01816.26
5.6.60.0050.02116.37
5.6.50.0070.01616.43
5.6.40.0030.02216.35
5.6.30.0030.01816.24
5.6.20.0030.02016.43
5.6.10.0050.02016.40
5.6.00.0060.01916.20
5.5.380.0050.02314.41
5.5.370.0040.01814.27
5.5.360.0020.02214.38
5.5.350.0020.02114.33
5.5.340.0020.01914.68
5.5.330.0060.01614.63
5.5.320.0040.02014.52
5.5.310.0050.01714.45
5.5.300.0030.01914.52
5.5.290.0040.02114.59
5.5.280.0020.02314.51
5.5.270.0020.01914.61
5.5.260.0080.01714.53
5.5.250.0040.02014.37
5.5.240.0020.01714.19
5.5.230.0040.02114.26
5.5.220.0040.01714.13
5.5.210.0030.01914.29
5.5.200.0050.01914.26
5.5.190.0020.01714.14
5.5.180.0060.01814.21
5.5.170.0020.01212.98
5.5.160.0050.01714.35
5.5.150.0020.01714.17
5.5.140.0040.01914.29
5.5.130.0060.01714.34
5.5.120.0090.01314.27
5.5.110.0060.02814.33
5.5.100.0060.03014.24
5.5.90.0030.01814.33
5.5.80.0040.01714.19
5.5.70.0030.01814.33
5.5.60.0090.01614.26
5.5.50.0110.01814.42
5.5.40.0040.01714.36
5.5.30.0020.02114.22
5.5.20.0020.02114.32
5.5.10.0040.03014.24
5.5.00.0040.01914.12
5.4.450.0020.02213.83
5.4.440.0040.02713.86
5.4.430.0020.02014.02
5.4.420.0060.01513.86
5.4.410.0140.02013.79
5.4.400.0030.01713.75
5.4.390.0030.02013.77
5.4.380.0050.01713.85
5.4.370.0030.01613.86
5.4.360.0050.01613.72
5.4.350.0040.01713.75
5.4.340.0020.02013.82
5.4.330.0020.00611.04
5.4.320.0080.01313.95
5.4.310.0030.01913.70
5.4.300.0050.01713.78
5.4.290.0040.01913.71
5.4.280.0040.01613.79
5.4.270.0030.02113.81
5.4.260.0040.03013.72
5.4.250.0030.03213.75
5.4.240.0100.02013.71
5.4.230.0030.02013.81
5.4.220.0020.01613.70
5.4.210.0050.01613.65
5.4.200.0040.01813.84
5.4.190.0030.02113.79
5.4.180.0030.01713.71
5.4.170.0040.01713.86
5.4.160.0070.01613.71
5.4.150.0060.02113.85
5.4.140.0030.02013.19
5.4.130.0030.02013.04
5.4.120.0020.01613.13
5.4.110.0030.01713.08
5.4.100.0040.01613.02
5.4.90.0050.01813.10
5.4.80.0080.01513.12
5.4.70.0050.01713.09
5.4.60.0030.01713.10
5.4.50.0030.01713.09
5.4.40.0120.01613.12
5.4.30.0020.01713.13
5.4.20.0050.01413.07
5.4.10.0030.01913.10
5.4.00.0020.02113.02
5.3.290.0040.01812.87
5.3.280.0040.01612.92
5.3.270.0060.02012.93
5.3.260.0040.01912.88
5.3.250.0070.01512.94
5.3.240.0130.01612.79
5.3.230.0060.01712.89
5.3.220.0030.01712.86
5.3.210.0080.01412.81
5.3.200.0040.01812.88
5.3.190.0060.01712.87
5.3.180.0020.01612.85
5.3.170.0020.01812.93
5.3.160.0000.02012.92
5.3.150.0040.01812.91
5.3.140.0030.01912.83
5.3.130.0030.01812.84
5.3.120.0090.01612.92
5.3.110.0020.02112.89
5.3.100.0030.01512.90
5.3.90.0030.01512.97
5.3.80.0030.01712.89
5.3.70.0030.01512.88
5.3.60.0040.01812.80
5.3.50.0060.01412.90
5.3.40.0050.01512.94
5.3.30.0030.01612.86
5.3.20.0040.01812.81
5.3.10.0060.01312.75
5.3.00.0020.01712.82
5.2.170.0020.01714.05
5.2.160.0020.01714.05
5.2.150.0030.01914.05
5.2.140.0000.02014.05
5.2.130.0050.01514.05
5.2.120.0040.01614.05
5.2.110.0040.01614.05
5.2.100.0060.01414.05
5.2.90.0020.01714.05
5.2.80.0050.01714.05
5.2.70.0110.01514.05
5.2.60.0000.02014.05
5.2.50.0030.01714.05
5.2.40.0020.01914.05
5.2.30.0020.02014.05
5.2.20.0000.02114.05
5.2.10.0060.01414.05
5.2.00.0020.01714.05
5.1.60.0000.01814.05
5.1.50.0020.01714.05
5.1.40.0050.01514.05
5.1.30.0040.01814.05
5.1.20.0070.01414.05
5.1.10.0030.01514.05
5.1.00.0030.01614.05
5.0.50.0000.01514.05
5.0.40.0040.01314.05
5.0.30.0060.01614.05
5.0.20.0020.01214.05
5.0.10.0010.01514.05
5.0.00.0020.01814.05
4.4.90.0030.01214.05
4.4.80.0010.01114.05
4.4.70.0020.01214.05
4.4.60.0020.01014.05
4.4.50.0040.00914.05
4.4.40.0050.01414.05
4.4.30.0020.01014.05
4.4.20.0050.00814.05
4.4.10.0030.00814.05
4.4.00.0000.01714.05
4.3.110.0000.01714.05
4.3.100.0020.01614.05
4.3.90.0040.00914.05
4.3.80.0040.01914.05
4.3.70.0030.01214.05
4.3.60.0020.01714.05
4.3.50.0020.01114.05
4.3.40.0050.02014.05
4.3.30.0020.01414.05
4.3.20.0010.01014.05
4.3.10.0020.02214.05
4.3.00.0050.01714.05

preferences:
49.09 ms | 401 KiB | 5 Q