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 = array(); $find_word = null; $upper_word = null; $lower_word = null; $cap_word = null; $num_word = null; $find_word = function () use (&$char, $alpha_num, $lower, $upper, $next, $peek, &$lower_word, &$upper_word, &$cap_word, &$num_word) { while (!$alpha_num($char)) { if (!$next()) { return null; } } if ($lower($char)) { return $lower_word; } if ($upper($char)) { if ($upper($peek())) { // uppercase word return $upper_word; } return $cap_word; // capitalized word } return $num_word; }; $upper_word = function() use (&$out, &$char, $next, $peek, $upper, $lower, &$find_word) { $word = $char; while ($next() && $upper($char)) { if ($lower($peek())) { break; } $word .= $char; } $out[] = $word; return $find_word; }; $state = $find_word; while ($state !== null) { $state = $state(); } return strtolower(implode('_', $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)
8.3.60.0060.01218.31
8.3.50.0110.01121.98
8.3.40.0060.01218.84
8.3.30.0080.00619.21
8.3.20.0050.00320.20
8.3.10.0050.00321.90
8.3.00.0120.00317.93
8.2.180.0140.00716.75
8.2.170.0140.00422.96
8.2.160.0060.01120.47
8.2.150.0080.00024.18
8.2.140.0080.00024.66
8.2.130.0070.00726.16
8.2.120.0000.00821.09
8.2.110.0030.00620.61
8.2.100.0070.00418.28
8.2.90.0040.00419.48
8.2.80.0030.00517.97
8.2.70.0060.00317.88
8.2.60.0080.00018.05
8.2.50.0090.00018.07
8.2.40.0050.00319.95
8.2.30.0040.00418.32
8.2.20.0040.00417.81
8.2.10.0040.00418.27
8.2.00.0000.00717.82
8.1.280.0040.01125.92
8.1.270.0000.00723.96
8.1.260.0070.00026.35
8.1.250.0040.00428.09
8.1.240.0090.00023.81
8.1.230.0040.00819.00
8.1.220.0000.00817.78
8.1.210.0080.00018.77
8.1.200.0000.00917.48
8.1.190.0000.00817.35
8.1.180.0040.00418.10
8.1.170.0040.00418.71
8.1.160.0000.00722.11
8.1.150.0020.00519.05
8.1.140.0030.00517.64
8.1.130.0070.00017.97
8.1.120.0000.00717.61
8.1.110.0040.00417.52
8.1.100.0080.00017.44
8.1.90.0000.00717.46
8.1.80.0050.00317.46
8.1.70.0040.00417.55
8.1.60.0060.00317.59
8.1.50.0080.00017.68
8.1.40.0000.00917.66
8.1.30.0000.00817.64
8.1.20.0030.00517.72
8.1.10.0040.00417.67
8.1.00.0040.00417.59
8.0.300.0000.00718.77
8.0.290.0040.00417.00
8.0.280.0030.00318.54
8.0.270.0040.00417.29
8.0.260.0030.00317.22
8.0.250.0040.00416.98
8.0.240.0040.00416.95
8.0.230.0070.00017.11
8.0.220.0070.00016.94
8.0.210.0030.00316.96
8.0.200.0100.00017.02
8.0.190.0000.00817.17
8.0.180.0070.00017.09
8.0.170.0030.00516.96
8.0.160.0000.00717.01
8.0.150.0000.00716.88
8.0.140.0070.00316.91
8.0.130.0060.00013.53
8.0.120.0030.00516.92
8.0.110.0080.00016.93
8.0.100.0040.00416.85
8.0.90.0030.00517.00
8.0.80.0030.01417.00
8.0.70.0000.00717.09
8.0.60.0050.00317.11
8.0.50.0000.00817.06
8.0.30.0110.00816.98
8.0.20.0210.00517.40
8.0.10.0000.00816.98
8.0.00.0110.00617.02
7.4.330.0050.00015.15
7.4.320.0000.00716.64
7.4.300.0060.00016.45
7.4.290.0030.00316.60
7.4.280.0000.00716.66
7.4.270.0040.00416.69
7.4.260.0000.00716.65
7.4.250.0080.00016.57
7.4.240.0040.00416.60
7.4.230.0000.00716.63
7.4.220.0090.01016.62
7.4.210.0000.01416.79
7.4.200.0000.00716.64
7.4.160.0070.01116.61
7.4.150.0080.01117.40
7.4.140.0110.01117.86
7.4.130.0110.00616.61
7.4.120.0070.01316.66
7.4.110.0040.01416.61
7.4.100.0120.00616.50
7.4.90.0070.01416.57
7.4.80.0050.01219.39
7.4.70.0060.01716.50
7.4.60.0110.01116.57
7.4.50.0000.00516.56
7.4.40.0090.00616.57
7.4.30.0070.01016.49
7.4.00.0080.00815.06
7.3.330.0000.00613.45
7.3.320.0000.00613.26
7.3.310.0030.00316.21
7.3.300.0040.00416.45
7.3.290.0000.01416.46
7.3.280.0090.01016.44
7.3.270.0090.00917.40
7.3.260.0060.01316.45
7.3.250.0140.01216.51
7.3.240.0070.01016.75
7.3.230.0040.01316.61
7.3.210.0070.01016.39
7.3.200.0120.00819.39
7.3.190.0160.00616.61
7.3.180.0110.00616.39
7.3.170.0120.00616.73
7.3.160.0090.00616.64
7.3.120.0070.01014.76
7.3.110.0080.00914.87
7.3.100.0040.01014.91
7.3.90.0090.00615.02
7.3.80.0080.00514.83
7.3.70.0010.01514.84
7.3.60.0060.00814.88
7.3.50.0070.00714.78
7.3.40.0070.00714.87
7.3.30.0030.00915.01
7.3.20.0040.01216.74
7.3.10.0090.00616.69
7.3.00.0060.00816.61
7.2.330.0060.01216.76
7.2.320.0090.00916.52
7.2.310.0060.01016.82
7.2.300.0070.01716.83
7.2.290.0120.00616.64
7.2.250.0080.01115.18
7.2.240.0080.01115.10
7.2.230.0090.00415.30
7.2.220.0040.01115.12
7.2.210.0060.01015.27
7.2.200.0070.00915.09
7.2.190.0080.00615.19
7.2.180.0060.01015.26
7.2.170.0080.00715.09
7.2.160.0060.00915.04
7.2.150.0040.01217.18
7.2.140.0070.01116.97
7.2.130.0060.00617.03
7.2.120.0000.01617.01
7.2.110.0060.01017.04
7.2.100.0060.00916.99
7.2.90.0000.01616.86
7.2.80.0070.00316.86
7.2.70.0090.00616.98
7.2.60.0070.00716.90
7.2.50.0060.00616.98
7.2.40.0000.01017.10
7.2.30.0030.01316.98
7.2.20.0060.00917.14
7.2.10.0100.00017.13
7.2.00.0020.01218.21
7.1.330.0080.00715.84
7.1.320.0060.00515.75
7.1.310.0050.01015.82
7.1.300.0040.01015.96
7.1.290.0070.00815.69
7.1.280.0070.00515.81
7.1.270.0030.00715.58
7.1.260.0040.01015.76
7.1.250.0100.00015.69
7.1.200.0000.01315.83
7.1.100.0040.00818.15
7.1.70.0000.00717.20
7.1.60.0060.01919.25
7.1.50.0090.01216.95
7.1.00.0000.08022.30
7.0.200.0060.00316.74
7.0.140.0070.06722.16
7.0.110.0000.09020.16
7.0.100.0100.07720.15
7.0.90.0170.08020.00
7.0.80.0230.06320.16
7.0.70.0070.05720.01
7.0.60.0170.08019.91
7.0.50.0100.05320.54
7.0.40.0070.07720.19
7.0.30.0130.06720.22
7.0.20.0070.08020.15
7.0.10.0130.07720.15
7.0.00.0130.07720.23
5.6.280.0100.06721.18
5.6.260.0000.08020.75
5.6.250.0070.08020.73
5.6.240.0070.08720.76
5.6.230.0030.08320.71
5.6.220.0100.07320.55
5.6.210.0170.07020.68
5.6.200.0030.07021.16
5.6.190.0300.05721.23
5.6.180.0100.08021.24
5.6.170.0070.08721.29
5.6.160.0100.08321.01
5.6.150.0070.05721.32
5.6.140.0100.07321.00
5.6.130.0100.08021.07
5.6.120.0030.09021.33
5.6.110.0100.08021.13
5.6.100.0100.08021.13
5.6.90.0100.05321.16
5.6.80.0100.07320.55
5.6.70.0070.07320.57
5.6.60.0000.09020.56
5.6.50.0130.07720.49
5.6.40.0130.07320.55
5.6.30.0170.04320.54
5.6.20.0000.05320.52
5.6.10.0170.06720.34
5.6.00.0070.08020.35
5.5.380.0100.07320.63
5.5.370.0200.07020.59
5.5.360.0130.06320.43
5.5.350.0100.07320.42
5.5.340.0070.08721.01
5.5.330.0100.08020.86
5.5.320.0130.06720.75
5.5.310.0070.04721.02
5.5.300.0030.04320.80
5.5.290.0100.05020.86
5.5.280.0000.07020.89
5.5.270.0030.09020.85
5.5.260.0100.08021.07
5.5.250.0100.06720.88
5.5.240.0030.08320.17
5.5.230.0030.08320.40
5.5.220.0130.08020.37
5.5.210.0030.08720.35
5.5.200.0070.08020.10
5.5.190.0030.08020.38
5.5.180.0130.07020.21
5.5.160.0070.06020.32
5.5.150.0030.08320.30
5.5.140.0100.07720.14
5.5.130.0000.08320.10
5.5.120.0100.07720.20
5.5.110.0070.08020.16
5.5.100.0200.07020.08
5.5.90.0030.07720.18
5.5.80.0030.08020.19
5.5.70.0200.07020.04
5.5.60.0030.08320.14
5.5.50.0070.07320.29
5.5.40.0030.07720.18
5.5.30.0130.07720.17
5.5.20.0030.08320.14
5.5.10.0100.07320.06
5.5.00.0030.07720.15
5.4.450.0100.08319.42
5.4.440.0070.08319.64
5.4.430.0070.05019.25
5.4.420.0070.08019.55
5.4.410.0130.06019.15
5.4.400.0170.07319.32
5.4.390.0030.07718.99
5.4.380.0170.06319.23
5.4.370.0130.07019.32
5.4.360.0070.07719.24
5.4.350.0070.08019.25
5.4.340.0070.07319.19
5.4.320.0100.07319.00
5.4.310.0000.08019.24
5.4.300.0070.08019.16
5.4.290.0030.06319.00
5.4.280.0030.04319.18
5.4.270.0030.05719.34
5.4.260.0130.06318.98
5.4.250.0070.07018.98
5.4.240.0100.07319.01
5.4.230.0070.07019.02
5.4.220.0070.04719.16
5.4.210.0070.06319.09
5.4.200.0100.07719.02
5.4.190.0170.07018.94
5.4.180.0100.07318.97
5.4.170.0000.06719.23
5.4.160.0070.06719.22
5.4.150.0070.05719.16
5.4.140.0100.06716.35
5.4.130.0070.07316.64
5.4.120.0030.07716.44
5.4.110.0200.03316.60
5.4.100.0070.05016.56
5.4.90.0070.07016.56
5.4.80.0070.07316.51
5.4.70.0070.07016.36
5.4.60.0030.07016.58
5.4.50.0070.06716.45
5.4.40.0000.07316.38
5.4.30.0200.06316.29
5.4.20.0030.04716.64
5.4.10.0100.07016.57
5.4.00.0130.06315.86
5.3.290.0100.07014.89
5.3.280.0100.07314.81
5.3.270.0030.07714.76
5.3.260.0100.07014.97
5.3.250.0070.07314.98
5.3.240.0030.05314.73
5.3.230.0100.07014.75
5.3.220.0070.07714.85
5.3.210.0030.08314.73
5.3.200.0070.07314.67
5.3.190.0130.05714.84
5.3.180.0100.07714.93
5.3.170.0100.07314.66
5.3.160.0100.06314.71
5.3.150.0070.06314.93
5.3.140.0000.07714.71
5.3.130.0100.04714.73
5.3.120.0070.07714.72
5.3.110.0100.07014.70
5.3.100.0100.07014.26
5.3.90.0030.04314.38
5.3.80.0070.07314.16
5.3.70.0130.06714.21
5.3.60.0030.06014.13
5.3.50.0070.07314.10
5.3.40.0070.05014.11
5.3.30.0100.06714.04
5.3.20.0030.07013.84
5.3.10.0070.07313.80
5.3.00.0070.07313.63
5.2.170.0030.05311.77
5.2.160.0030.06011.77
5.2.150.0100.03011.77
5.2.140.0030.06311.77
5.2.130.0070.05711.77
5.2.120.0030.05711.77
5.2.110.0030.06311.77
5.2.100.0030.06311.77
5.2.90.0000.06011.77
5.2.80.0000.06311.77
5.2.70.0070.06011.77
5.2.60.0030.06711.77
5.2.50.0070.03311.77
5.2.40.0070.06011.77
5.2.30.0030.06311.77
5.2.20.0000.06711.77
5.2.10.0070.05711.77
5.2.00.0030.06711.77
5.1.60.0070.04711.77
5.1.50.0100.03711.77
5.1.40.0030.05311.77
5.1.30.0070.05011.77
5.1.20.0100.04311.77
5.1.10.0000.05711.77
5.1.00.0070.05311.77
5.0.50.0030.04311.77
5.0.40.0070.03711.77
5.0.30.0030.03711.77
5.0.20.0030.04311.77
5.0.10.0030.04311.77
5.0.00.0030.06011.77
4.4.90.0070.03011.77
4.4.80.0030.03311.77
4.4.70.0000.03711.77
4.4.60.0070.03011.77
4.4.50.0070.02711.77
4.4.40.0030.05011.77
4.4.30.0000.03311.77
4.4.20.0000.04011.77
4.4.10.0000.02011.77
4.4.00.0030.05311.77
4.3.110.0030.01711.77
4.3.100.0070.02711.77
4.3.90.0030.03311.77
4.3.80.0070.05011.77
4.3.70.0070.02011.77
4.3.60.0000.03711.77
4.3.50.0000.02711.77
4.3.40.0000.04311.77
4.3.30.0000.03711.77
4.3.20.0030.03311.77
4.3.10.0000.02311.77
4.3.00.0000.03311.77

preferences:
54.68 ms | 401 KiB | 5 Q