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(); $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())) { // start of capitalized word (e.g. FOOBar at B) break; } $word .= $char; } $out[] = $word; return $find_word; }; $lower_word = function() use (&$out, &$char, $next, $lower, $find_word) { $word = $char; while ($next() && $lower($char)) { $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)
8.3.70.0160.00616.63
8.3.60.0070.01018.43
8.3.50.0230.00821.98
8.3.40.0140.00718.82
8.3.30.0090.00619.11
8.3.20.0080.00020.48
8.3.10.0070.00021.90
8.3.00.0120.00317.91
8.2.180.0120.00916.75
8.2.170.0060.01222.96
8.2.160.0070.00720.65
8.2.150.0000.00824.18
8.2.140.0030.00624.66
8.2.130.0030.00526.16
8.2.120.0030.00621.09
8.2.110.0060.00322.11
8.2.100.0080.00418.41
8.2.90.0030.00519.29
8.2.80.0060.00317.97
8.2.70.0090.00017.75
8.2.60.0030.00518.05
8.2.50.0000.01118.07
8.2.40.0040.00418.34
8.2.30.0000.00718.35
8.2.20.0000.00817.84
8.2.10.0000.00718.25
8.2.00.0000.00917.90
8.1.280.0100.00625.92
8.1.270.0040.00423.96
8.1.260.0040.00426.35
8.1.250.0070.00028.09
8.1.240.0100.00023.83
8.1.230.0080.00419.13
8.1.220.0000.00817.74
8.1.210.0080.00018.77
8.1.200.0000.01017.48
8.1.190.0050.00317.25
8.1.180.0040.00418.10
8.1.170.0050.00318.63
8.1.160.0000.00722.11
8.1.150.0040.00418.91
8.1.140.0070.00017.48
8.1.130.0040.00417.96
8.1.120.0030.00517.50
8.1.110.0080.00017.48
8.1.100.0000.00817.65
8.1.90.0040.00417.63
8.1.80.0040.00417.51
8.1.70.0000.00717.57
8.1.60.0030.00617.68
8.1.50.0030.00517.61
8.1.40.0040.00417.55
8.1.30.0040.00417.78
8.1.20.0000.00817.68
8.1.10.0030.00517.72
8.1.00.0050.00317.66
8.0.300.0040.00418.77
8.0.290.0000.00716.75
8.0.280.0000.00718.55
8.0.270.0040.00417.26
8.0.260.0080.00017.35
8.0.250.0030.00317.17
8.0.240.0080.00017.20
8.0.230.0000.00717.04
8.0.220.0030.00317.09
8.0.210.0030.00317.06
8.0.200.0030.00717.09
8.0.190.0040.00417.11
8.0.180.0000.00717.10
8.0.170.0030.00517.15
8.0.160.0000.00817.09
8.0.150.0000.00817.09
8.0.140.0060.00317.05
8.0.130.0000.00613.45
8.0.120.0000.00817.07
8.0.110.0080.00017.11
8.0.100.0050.00317.18
8.0.90.0050.00317.18
8.0.80.0100.01017.03
8.0.70.0040.00417.08
8.0.60.0000.00716.90
8.0.50.0000.00816.95
8.0.30.0110.01117.11
8.0.20.0090.01017.40
8.0.10.0000.00817.29
8.0.00.0100.00816.96
7.4.330.0030.00315.09
7.4.320.0040.00416.72
7.4.300.0000.00716.68
7.4.290.0030.00516.75
7.4.280.0000.00716.71
7.4.270.0040.00416.74
7.4.260.0030.00316.61
7.4.250.0030.00616.56
7.4.240.0040.00416.58
7.4.230.0040.00416.53
7.4.220.0070.01116.73
7.4.210.0040.01116.73
7.4.200.0040.00416.80
7.4.160.0100.00616.73
7.4.150.0120.00817.40
7.4.140.0100.00717.86
7.4.130.0110.00616.61
7.4.120.0050.01216.63
7.4.110.0030.01416.77
7.4.100.0090.00916.70
7.4.90.0060.01216.65
7.4.80.0160.00819.39
7.4.70.0140.00816.39
7.4.60.0130.00616.76
7.4.50.0060.00316.41
7.4.40.0140.00316.56
7.4.30.0060.01216.64
7.4.00.0060.01214.81
7.3.330.0030.00313.34
7.3.320.0030.00313.37
7.3.310.0080.00016.40
7.3.300.0080.00016.29
7.3.290.0090.00616.46
7.3.280.0130.00916.48
7.3.270.0110.00717.40
7.3.260.0100.01416.57
7.3.250.0130.00616.48
7.3.240.0120.00616.46
7.3.230.0070.01116.46
7.3.210.0060.01016.46
7.3.200.0130.00319.39
7.3.190.0130.01016.49
7.3.180.0110.00616.57
7.3.170.0100.01016.77
7.3.160.0060.00916.59
7.3.120.0030.01315.21
7.2.330.0140.00316.83
7.2.320.0100.01016.58
7.2.310.0100.00716.51
7.2.300.0120.00816.82
7.2.290.0090.00916.72
7.1.70.0000.00716.87
7.1.60.0190.00719.25
7.1.50.0000.02016.96
7.1.00.0030.07722.48
7.0.200.0060.00316.84
7.0.140.0000.08022.01
7.0.100.0070.05020.01
7.0.90.0300.07319.97
7.0.80.0070.07720.20
7.0.70.0230.09020.04
7.0.60.0200.07020.17
7.0.50.0070.08720.18
7.0.40.0100.06720.11
7.0.30.0130.05320.13
7.0.20.0030.07320.02
7.0.10.0030.07020.16
7.0.00.0130.08719.98
5.6.280.0030.07720.90
5.6.250.0130.03720.65
5.6.240.0130.04020.56
5.6.230.0070.08320.65
5.6.220.0200.04320.52
5.6.210.0070.06320.54
5.6.200.0130.04021.01
5.6.190.0100.07320.98
5.6.180.0200.07321.10
5.6.170.0070.05321.07
5.6.160.0200.07321.16
5.6.150.0100.08321.12
5.6.140.0100.08721.08
5.6.130.0030.05321.21
5.6.120.0100.06720.97
5.6.110.0070.06021.13
5.6.100.0100.08321.14
5.6.90.0070.07321.06
5.6.80.0030.06320.60
5.6.70.0070.05720.46
5.6.60.0030.08320.35
5.6.50.0030.05720.44
5.6.40.0170.07720.32
5.6.30.0130.08320.48
5.6.20.0100.04020.44
5.6.10.0070.04320.43
5.6.00.0130.03720.42
5.5.380.0100.08020.39
5.5.370.0070.08720.41
5.5.360.0100.05320.47
5.5.350.0070.08320.44
5.5.340.0170.07720.85
5.5.330.0000.09020.95
5.5.320.0100.04320.81
5.5.310.0170.04020.82
5.5.300.0130.07720.91
5.5.290.0070.08320.79
5.5.280.0170.08020.86
5.5.270.0030.08720.95
5.5.260.0130.07020.76
5.5.250.0070.08020.65
5.5.240.0100.03720.35
5.5.230.0200.07020.22
5.5.220.0130.06320.06
5.5.210.0170.04720.33
5.5.200.0070.07320.33
5.5.190.0030.09020.26
5.5.180.0130.08020.16
5.5.160.0030.04720.04
5.5.150.0100.02720.25
5.5.140.0070.03320.17
5.5.130.0030.03320.20
5.5.120.0030.04320.29
5.5.110.0070.03020.11
5.5.100.0000.03720.09
5.5.90.0100.03019.99
5.5.80.0070.04720.11
5.5.70.0000.03720.13
5.5.60.0030.03720.16
5.5.50.0130.03020.19
5.5.40.0000.03720.06
5.5.30.0030.04020.09
5.5.20.0030.03720.14
5.5.10.0030.03720.09
5.5.00.0030.03320.17
5.4.450.0100.07719.37
5.4.440.0100.05019.54
5.4.430.0130.07319.27
5.4.420.0130.06719.37
5.4.410.0100.03719.25
5.4.400.0130.07018.95
5.4.390.0230.06719.16
5.4.380.0100.04019.04
5.4.370.0070.04719.13
5.4.360.0100.06319.04
5.4.350.0070.05318.95
5.4.340.0100.03718.95
5.4.320.0030.04019.21
5.4.310.0070.03719.04
5.4.300.0070.03019.18
5.4.290.0100.04319.03
5.4.280.0070.03018.92
5.4.270.0130.04718.95
5.4.260.0070.03319.20
5.4.250.0070.03019.18
5.4.240.0000.03319.04
5.4.230.0030.03019.13
5.4.220.0100.03718.88
5.4.210.0170.02019.17
5.4.200.0030.03319.24
5.4.190.0030.05019.05
5.4.180.0030.04019.18
5.4.170.0100.03319.04
5.4.160.0100.03018.89
5.4.150.0030.07019.20
5.4.140.0130.03316.44
5.4.130.0100.03316.38
5.4.120.0070.03016.49
5.4.110.0030.03716.48
5.4.100.0070.02716.47
5.4.90.0030.03316.40
5.4.80.0030.03016.39
5.4.70.0100.02316.49
5.4.60.0000.03316.37
5.4.50.0030.03316.49
5.4.40.0070.03316.47
5.4.30.0070.03316.46
5.4.20.0130.02316.46
5.4.10.0030.03316.53
5.4.00.0100.03015.92
5.3.290.0030.03314.88
5.3.280.0100.03314.67
5.3.270.0030.04014.82
5.3.260.0000.03714.81
5.3.250.0000.03714.68
5.3.240.0070.03014.78
5.3.230.0100.03014.70
5.3.220.0000.04314.75
5.3.210.0070.03714.79
5.3.200.0000.03714.84
5.3.190.0070.05314.86
5.3.180.0030.03014.72
5.3.170.0030.03314.64
5.3.160.0100.04014.64
5.3.150.0070.04014.70
5.3.140.0030.03314.77
5.3.130.0100.02714.84
5.3.120.0070.03014.76
5.3.110.0030.03314.65
5.3.100.0100.02714.12
5.3.90.0030.03014.16
5.3.80.0070.05314.18
5.3.70.0000.03314.30
5.3.60.0070.05714.20
5.3.50.0100.05314.00
5.3.40.0000.03314.23
5.3.30.0100.02314.07
5.3.20.0030.05313.89
5.3.10.0100.03013.86
5.3.00.0030.07713.79

preferences:
63.18 ms | 401 KiB | 5 Q