3v4l.org

run code in 300+ PHP versions simultaneously
<?php function do_split($name) { return preg_split('/([A-Z]{2,}|([A-Z][^A-Z]*))/', $name, null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY); } function convert_case($name) { return implode( '_', array_map( 'strtolower', do_split($name) ) ); } function convert_case2($in) { $len = strlen($in); if ($len < 2) { return strtolower($in); } // no state $upper = function ($c) { return 'A' <= $c && $c <= 'Z'; }; $lower = function ($c) { return 'a' <= $c && $c <= 'z'; }; $alpha = function ($c) use ($upper, $lower) { return $upper($c) || $lower($c); }; $num = function ($c) { return '0' <= $c && $c <= '9'; }; $alpha_num = function ($c) use ($alpha, $num) { return $alpha($c) || $num($c); }; // stream state $pos = 0; $char = $in[0]; $peek = function() use ($in, &$pos, $len) { if ($pos+1 >= $len) { return null; } return $in[$pos+1]; }; $next = function() use ($peek, &$pos, &$char) { $char = $peek(); $pos++; return $char !== null; }; // lex state $out = ''; $start_state = function () use (&$out, &$char, $next, $peek) { while ($next()) { $out .= $char; } return null; }; $state = $start_state; while ($state !== null) { $state = $state(); } return strtolower($out); } convert_case2('FooBARbar0123'); $samples = array( 'FooBar', 'FooBAR', 'FOOBar', 'foo_bar', 'FOO_bar', 'FOO_Bar', 'foo_BAR', 'foo_Bar', 'Foo_bar', ); print_r(array_map(function ($name) { return array( 'name' => $name, 'converted' => convert_case2($name), // 'converted' => convert_case($name), ); }, $samples));

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)
8.3.60.0100.01018.56
8.3.50.0110.00821.99
8.3.40.0150.00418.95
8.3.30.0140.00019.21
8.3.20.0040.00420.16
8.3.10.0080.00021.90
8.3.00.0080.00018.05
8.2.180.0070.01318.29
8.2.170.0040.01122.96
8.2.160.0130.00620.38
8.2.150.0030.00524.18
8.2.140.0040.00424.66
8.2.130.0080.00026.16
8.2.120.0070.00021.25
8.2.110.0100.00020.35
8.2.100.0040.00818.16
8.2.90.0000.00919.21
8.2.80.0040.00417.97
8.2.70.0000.00817.75
8.2.60.0040.00417.93
8.2.50.0060.00318.07
8.2.40.0050.00318.03
8.2.30.0040.00418.39
8.2.20.0050.00317.88
8.2.10.0040.00418.20
8.2.00.0090.00017.88
8.1.280.0030.01225.92
8.1.270.0070.00024.02
8.1.260.0000.00726.35
8.1.250.0080.00028.09
8.1.240.0000.01023.87
8.1.230.0040.00719.16
8.1.220.0050.00317.78
8.1.210.0000.00818.77
8.1.200.0060.00317.47
8.1.190.0050.00317.35
8.1.180.0040.00418.10
8.1.170.0050.00318.67
8.1.160.0040.00422.03
8.1.150.0040.00418.82
8.1.140.0040.00417.46
8.1.130.0030.00317.79
8.1.120.0040.00417.53
8.1.110.0040.00417.45
8.1.100.0040.00417.33
8.1.90.0000.00717.52
8.1.80.0000.00717.44
8.1.70.0000.00717.44
8.1.60.0030.00617.57
8.1.50.0050.00317.55
8.1.40.0040.00417.54
8.1.30.0040.00417.73
8.1.20.0000.00817.50
8.1.10.0030.00517.58
8.1.00.0030.00517.48
8.0.300.0070.00018.77
8.0.290.0040.00416.88
8.0.280.0070.00018.48
8.0.270.0030.00517.17
8.0.260.0030.00317.18
8.0.250.0000.00717.10
8.0.240.0070.00017.03
8.0.230.0070.00017.05
8.0.220.0000.00716.82
8.0.210.0020.00516.85
8.0.200.0050.00517.04
8.0.190.0000.00817.02
8.0.180.0000.00716.97
8.0.170.0000.00817.05
8.0.160.0040.00416.85
8.0.150.0030.00616.82
8.0.140.0000.01016.95
8.0.130.0060.00013.36
8.0.120.0000.00816.96
8.0.110.0050.00216.89
8.0.100.0040.00416.90
8.0.90.0040.00416.75
8.0.80.0040.01116.92
8.0.70.0040.00416.89
8.0.60.0040.00416.91
8.0.50.0040.00416.80
8.0.30.0120.00917.08
8.0.20.0130.01017.40
8.0.10.0000.00717.09
8.0.00.0110.00716.87
7.4.330.0050.00015.09
7.4.320.0030.00316.59
7.4.300.0090.00016.60
7.4.290.0030.00316.58
7.4.280.0040.00416.51
7.4.270.0070.00016.52
7.4.260.0000.00816.46
7.4.250.0070.00016.48
7.4.240.0060.00116.56
7.4.230.0030.00316.41
7.4.220.0030.01416.38
7.4.210.0030.01016.64
7.4.200.0080.00016.51
7.4.160.0000.01716.55
7.4.150.0070.01117.40
7.4.140.0110.00817.86
7.4.130.0120.00716.48
7.4.120.0070.01016.63
7.4.110.0120.00616.50
7.4.100.0070.01016.51
7.4.90.0100.00716.43
7.4.80.0180.00019.39
7.4.70.0070.01716.64
7.4.60.0070.01016.51
7.4.50.0030.00316.57
7.4.40.0030.01316.27
7.4.30.0100.00716.48
7.4.00.0060.00815.06
7.3.330.0030.00313.34
7.3.320.0000.00613.36
7.3.310.0030.00316.27
7.3.300.0000.00716.25
7.3.290.0090.01216.30
7.3.280.0090.00716.36
7.3.270.0070.01117.40
7.3.260.0090.00916.78
7.3.250.0180.00616.49
7.3.240.0140.00316.37
7.3.230.0100.00716.54
7.3.210.0030.01416.43
7.3.200.0100.00719.39
7.3.190.0000.01616.30
7.3.180.0160.00016.55
7.3.170.0060.01216.58
7.3.160.0100.00716.45
7.3.120.0100.00314.88
7.2.330.0120.00616.64
7.2.320.0140.00716.83
7.2.310.0040.01216.96
7.2.300.0090.01516.46
7.2.290.0100.00716.58
7.2.00.0060.00619.58
7.1.100.0090.00318.08
7.1.70.0000.00817.18
7.1.60.0140.01119.25
7.1.50.0100.01616.66
7.1.00.0000.08022.54
7.0.200.0040.00816.71
7.0.140.0070.06322.09
7.0.60.0130.04720.05
7.0.50.0130.07717.86
7.0.40.0070.07720.15
7.0.30.0270.08020.24
7.0.20.0300.06720.19
7.0.10.0130.08020.07
7.0.00.0100.08020.05
5.6.280.0030.07020.89
5.6.210.0130.08020.50
5.6.200.0030.07318.16
5.6.190.0100.08020.61
5.6.180.0370.06020.48
5.6.170.0230.07720.59
5.6.160.0030.05020.39
5.6.150.0000.08718.15
5.6.140.0130.05318.14
5.6.130.0170.07318.21
5.6.120.0030.06721.03
5.6.110.0130.07721.11
5.6.100.0100.07021.02
5.6.90.0100.08021.12
5.6.80.0070.06320.54
5.5.350.0300.07320.45
5.5.340.0030.08317.95
5.5.330.0130.08320.44
5.5.320.0270.03020.19
5.5.310.0270.04020.32
5.5.300.0100.05018.05
5.5.290.0170.07017.96
5.5.280.0070.06320.90
5.5.270.0070.08320.67
5.5.260.0000.08021.00
5.5.250.0030.09020.71
5.5.240.0070.07320.21
5.4.450.0230.03719.21
5.4.440.0230.03319.47
5.4.430.0230.03319.38
5.4.420.0200.03719.55
5.4.410.0270.03019.46
5.4.400.0170.03718.99
5.4.390.0170.04019.14
5.4.380.0270.03019.20
5.4.370.0270.03018.86
5.4.360.0270.05319.22
5.4.350.0270.06319.23
5.4.340.0330.06719.09
5.4.320.0300.06018.88
5.4.310.0230.06019.05
5.4.300.0300.04019.22
5.4.290.0330.07019.32
5.4.280.0370.04718.88
5.4.270.0300.07319.13
5.4.260.0400.05019.13
5.4.250.0330.03019.15
5.4.240.0330.04319.22
5.4.230.0330.04019.08
5.4.220.0370.06718.87
5.4.210.0400.03019.19
5.4.200.0330.07018.94
5.4.190.0330.04319.00
5.4.180.0300.07319.21
5.4.170.0270.08019.05
5.4.160.0230.05719.29
5.4.150.0370.06319.21
5.4.140.0270.06016.71
5.4.130.0270.07016.38
5.4.120.0400.06716.52
5.4.110.0330.05016.31
5.4.100.0300.05016.59
5.4.90.0270.03716.24
5.4.80.0230.03716.63
5.4.70.0370.06016.41
5.4.60.0370.06716.31
5.4.50.0400.05716.57
5.4.40.0300.04316.38
5.4.30.0330.06716.44
5.4.20.0270.04016.50
5.4.10.0300.04316.32
5.4.00.0200.04715.85
5.3.290.0330.07314.74
5.3.280.0370.07014.72
5.3.270.0400.06014.77
5.3.260.0300.07314.68
5.3.250.0400.06014.58
5.3.240.0370.06714.73
5.3.230.0270.05714.66
5.3.220.0370.03714.59
5.3.210.0270.06314.51
5.3.200.0270.04314.51
5.3.190.0270.04314.73
5.3.180.0230.05014.74
5.3.170.0330.06314.59
5.3.160.0370.05714.58
5.3.150.0300.07714.51
5.3.140.0270.05314.59
5.3.130.0270.07314.75
5.3.120.0300.06014.71
5.3.110.0370.05014.58
5.3.100.0270.03314.15
5.3.90.0300.05313.98
5.3.80.0270.07714.07
5.3.70.0230.04014.28
5.3.60.0230.05014.13
5.3.50.0230.03713.91
5.3.40.0200.07314.00
5.3.30.0200.05314.01
5.3.20.0270.06713.64
5.3.10.0330.06013.91
5.3.00.0300.03013.70
5.2.170.0270.04011.32
5.2.160.0200.03711.32
5.2.150.0230.05711.16
5.2.140.0200.05011.06
5.2.130.0270.05311.09
5.2.120.0200.04311.11
5.2.110.0170.06311.19
5.2.100.0270.03011.04
5.2.90.0200.03311.27
5.2.80.0230.06011.08
5.2.70.0200.06011.03
5.2.60.0270.05310.97
5.2.50.0330.04310.99
5.2.40.0270.04710.95
5.2.30.0230.05310.98
5.2.20.0230.05710.87
5.2.10.0270.05310.78
5.2.00.0270.05310.73
5.1.60.0230.0279.90
5.1.50.0270.04310.13
5.1.40.0200.02310.06
5.1.30.0200.05310.42
5.1.20.0200.03310.27
5.1.10.0230.0209.98
5.1.00.0170.0339.97
5.0.50.0170.0379.54
5.0.40.0030.0279.54
5.0.30.0200.0379.54
5.0.20.0130.0439.54
5.0.10.0170.0379.54
5.0.00.0130.0479.54
4.4.90.0130.0179.54
4.4.80.0100.0379.54
4.4.70.0170.0309.54
4.4.60.0130.0309.54
4.4.50.0130.0279.54
4.4.40.0170.0409.54
4.4.30.0130.0179.54
4.4.20.0130.0279.54
4.4.10.0100.0339.54
4.4.00.0130.0309.54
4.3.110.0070.0179.54
4.3.100.0100.0179.54
4.3.90.0130.0239.54
4.3.80.0170.0409.54
4.3.70.0100.0309.54
4.3.60.0100.0209.54
4.3.50.0100.0179.54
4.3.40.0130.0479.54
4.3.30.0070.0339.54
4.3.20.0000.0309.54
4.3.10.0030.0309.54
4.3.00.0100.0239.54

preferences:
53.73 ms | 401 KiB | 5 Q