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; }; $cap_word = $lower_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)
8.3.60.0070.01418.55
8.3.50.0110.00721.93
8.3.40.0170.00318.95
8.3.30.0070.00719.35
8.3.20.0000.00820.32
8.3.10.0060.00321.66
8.3.00.0080.00018.05
8.2.180.0170.00016.47
8.2.170.0070.01422.96
8.2.160.0070.00720.47
8.2.150.0030.00524.18
8.2.140.0000.00824.66
8.2.130.0040.00426.16
8.2.120.0080.00020.93
8.2.110.0060.00322.07
8.2.100.0000.01118.47
8.2.90.0060.00319.34
8.2.80.0050.00317.97
8.2.70.0030.00617.88
8.2.60.0030.00517.93
8.2.50.0030.00618.07
8.2.40.0080.00018.34
8.2.30.0080.00018.47
8.2.20.0040.00417.79
8.2.10.0000.00718.36
8.2.00.0000.00918.03
8.1.280.0100.01325.92
8.1.270.0030.00523.82
8.1.260.0080.00026.35
8.1.250.0070.00028.09
8.1.240.0030.00623.88
8.1.230.0120.00019.13
8.1.220.0030.00517.91
8.1.210.0040.00418.77
8.1.200.0050.00517.38
8.1.190.0040.00417.48
8.1.180.0030.00518.10
8.1.170.0040.00418.72
8.1.160.0040.00422.13
8.1.150.0050.00318.84
8.1.140.0000.00817.62
8.1.130.0070.00018.02
8.1.120.0040.00417.59
8.1.110.0040.00417.50
8.1.100.0040.00417.60
8.1.90.0000.00817.57
8.1.80.0000.00817.48
8.1.70.0040.00417.54
8.1.60.0030.00617.71
8.1.50.0030.00517.64
8.1.40.0000.00917.63
8.1.30.0050.00317.73
8.1.20.0000.00917.71
8.1.10.0040.00417.58
8.1.00.0060.00317.63
8.0.300.0040.00418.77
8.0.290.0000.00816.88
8.0.280.0070.00018.68
8.0.270.0070.00017.37
8.0.260.0070.00017.30
8.0.250.0030.00317.20
8.0.240.0030.00317.21
8.0.230.0000.00717.04
8.0.220.0000.00717.02
8.0.210.0030.00317.10
8.0.200.0070.00317.11
8.0.190.0000.00817.14
8.0.180.0040.00417.07
8.0.170.0080.00017.15
8.0.160.0080.00016.96
8.0.150.0000.00916.98
8.0.140.0030.00716.91
8.0.130.0000.00613.47
8.0.120.0040.00417.07
8.0.110.0050.00217.06
8.0.100.0000.00817.15
8.0.90.0030.00516.96
8.0.80.0090.00617.15
8.0.70.0000.00717.08
8.0.60.0050.00317.04
8.0.50.0030.00516.97
8.0.30.0110.00817.14
8.0.20.0160.00617.42
8.0.10.0000.00717.17
8.0.00.0110.01117.01
7.4.330.0050.00015.20
7.4.320.0030.00316.67
7.4.300.0000.00616.75
7.4.290.0080.00016.74
7.4.280.0070.00016.63
7.4.270.0080.00016.65
7.4.260.0040.00416.72
7.4.250.0070.00016.52
7.4.240.0040.00316.57
7.4.230.0030.00316.56
7.4.220.0150.00416.66
7.4.210.0090.00916.57
7.4.200.0070.00016.52
7.4.160.0120.00616.48
7.4.150.0090.00917.40
7.4.140.0120.00617.86
7.4.130.0090.00916.69
7.4.120.0170.00216.53
7.4.110.0100.01016.71
7.4.100.0130.01316.59
7.4.90.0090.00916.54
7.4.80.0140.00619.39
7.4.70.0110.01016.77
7.4.60.0150.00316.71
7.4.50.0080.00016.48
7.4.40.0070.01016.78
7.4.30.0100.00716.74
7.4.00.0050.01215.00
7.3.330.0050.00013.34
7.3.320.0030.00313.48
7.3.310.0050.00316.48
7.3.300.0000.00716.52
7.3.290.0120.00316.45
7.3.280.0120.00716.48
7.3.270.0070.01017.40
7.3.260.0150.00316.49
7.3.250.0110.01116.51
7.3.240.0150.00316.71
7.3.230.0080.01216.59
7.3.210.0040.01416.53
7.3.200.0130.01019.39
7.3.190.0070.01016.52
7.3.180.0100.00716.46
7.3.170.0060.01216.46
7.3.160.0100.00616.61
7.3.120.0110.00814.99
7.3.110.0070.01014.76
7.3.100.0090.00314.56
7.3.90.0070.01014.83
7.3.80.0110.00715.12
7.3.70.0000.01014.83
7.3.60.0030.00714.78
7.3.50.0110.00415.02
7.3.40.0000.01014.57
7.3.30.0080.00314.86
7.3.20.0040.00816.56
7.3.10.0050.00816.74
7.3.00.0070.00716.51
7.2.330.0130.01016.86
7.2.320.0090.00916.54
7.2.310.0100.00716.68
7.2.300.0110.01416.88
7.2.290.0080.01516.79
7.2.250.0060.01015.34
7.2.240.0030.01615.19
7.2.230.0180.00015.24
7.2.220.0030.01215.30
7.2.210.0140.00415.00
7.2.200.0090.00615.30
7.2.190.0080.00615.14
7.2.180.0030.00615.07
7.2.170.0030.01015.11
7.2.130.0060.00916.93
7.2.120.0000.01517.00
7.2.110.0030.01017.07
7.2.100.0030.01316.82
7.2.90.0030.01316.55
7.2.80.0100.00717.03
7.2.70.0000.01117.05
7.2.60.0060.00616.77
7.2.50.0070.00717.00
7.2.40.0040.00816.79
7.2.30.0060.00916.92
7.2.20.0120.00316.93
7.2.10.0040.01117.04
7.2.00.0070.00518.08
7.1.330.0060.00915.78
7.1.320.0070.00715.53
7.1.310.0000.01815.46
7.1.300.0080.00415.59
7.1.290.0040.00915.95
7.1.280.0090.00615.87
7.1.270.0070.00715.80
7.1.260.0000.00915.89
7.1.250.0040.01115.60
7.1.100.0030.00618.22
7.1.70.0000.01217.21
7.1.60.0120.01219.25
7.1.50.0030.02016.97
7.1.00.0070.07322.44
7.0.200.0130.00716.88
7.0.140.0030.07321.96
7.0.100.0200.06719.99
7.0.90.0200.07319.97
7.0.80.0130.07720.01
7.0.70.0270.07019.93
7.0.60.0130.05020.13
7.0.50.0230.07320.36
7.0.40.0070.08020.10
7.0.30.0170.07320.18
7.0.20.0030.05320.13
7.0.10.0030.07720.18
7.0.00.0100.04020.14
5.6.280.0070.07321.07
5.6.250.0170.06720.68
5.6.240.0070.05320.74
5.6.230.0070.05320.62
5.6.220.0030.04320.66
5.6.210.0070.08320.79
5.6.200.0100.08021.10
5.6.190.0130.07721.10
5.6.180.0100.08321.13
5.6.170.0030.05021.07
5.6.160.0030.09021.11
5.6.150.0130.07021.11
5.6.140.0100.08321.09
5.6.130.0100.08021.11
5.6.120.0130.08021.11
5.6.110.0100.08321.00
5.6.100.0100.05320.99
5.6.90.0100.07720.99
5.6.80.0070.08020.40
5.6.70.0100.07320.36
5.6.60.0070.07320.45
5.6.50.0130.07320.39
5.6.40.0130.06320.41
5.6.30.0070.07320.37
5.6.20.0030.06320.35
5.6.10.0170.07320.44
5.6.00.0070.07720.41
5.5.380.0100.08020.54
5.5.370.0030.08320.40
5.5.360.0030.04320.43
5.5.350.0070.04720.47
5.5.340.0100.08020.84
5.5.330.0030.08720.86
5.5.320.0070.05720.94
5.5.310.0030.05020.96
5.5.300.0130.07320.95
5.5.290.0100.08020.97
5.5.280.0200.07320.77
5.5.270.0170.08020.82
5.5.260.0130.07320.82
5.5.250.0100.08020.50
5.5.240.0130.07320.33
5.5.230.0070.05020.20
5.5.220.0030.09020.22
5.5.210.0300.06020.29
5.5.200.0070.05320.29
5.5.190.0070.08320.25
5.5.180.0130.04020.21
5.5.160.0030.04020.32
5.5.150.0070.06720.32
5.5.140.0030.09720.37
5.5.130.0130.06020.15
5.5.120.0030.08020.15
5.5.110.0100.06320.25
5.5.100.0100.08020.15
5.5.90.0100.07720.09
5.5.80.0130.04020.12
5.5.70.0130.07320.12
5.5.60.0100.08020.19
5.5.50.0070.04720.19
5.5.40.0130.04320.13
5.5.30.0130.04020.08
5.5.20.0130.07320.07
5.5.10.0070.06720.08
5.5.00.0070.04020.17
5.4.450.0230.06019.42
5.4.440.0070.07719.49
5.4.430.0300.05319.23
5.4.420.0000.05719.45
5.4.410.0230.06319.30
5.4.400.0030.04718.95
5.4.390.0070.04319.15
5.4.380.0000.06319.03
5.4.370.0100.07019.07
5.4.360.0070.07719.21
5.4.350.0100.05319.24
5.4.340.0070.04718.88
5.4.320.0130.07719.03
5.4.310.0030.05319.03
5.4.300.0070.04719.05
5.4.290.0100.06719.03
5.4.280.0070.07718.95
5.4.270.0130.07319.14
5.4.260.0100.04019.31
5.4.250.0100.07719.14
5.4.240.0070.08319.04
5.4.230.0030.08719.25
5.4.220.0100.06319.23
5.4.210.0030.08019.09
5.4.200.0070.07719.04
5.4.190.0170.07319.12
5.4.180.0070.06719.17
5.4.170.0100.03318.84
5.4.160.0170.06719.17
5.4.150.0070.08019.18
5.4.140.0100.06316.39
5.4.130.0070.07316.48
5.4.120.0130.07016.46
5.4.110.0070.07716.52
5.4.100.0100.07716.56
5.4.90.0130.06716.52
5.4.80.0070.06016.40
5.4.70.0100.07316.31
5.4.60.0030.05316.36
5.4.50.0170.06016.37
5.4.40.0030.04716.50
5.4.30.0170.06716.39
5.4.20.0070.06016.39
5.4.10.0070.07016.30
5.4.00.0130.07015.93
5.3.290.0070.05015.55
5.3.280.0170.03315.55
5.3.270.0070.05015.55
5.3.260.0100.07315.55
5.3.250.0000.08715.55
5.3.240.0030.06015.55
5.3.230.0070.07715.55
5.3.220.0030.08315.55
5.3.210.0070.07715.55
5.3.200.0070.08015.55
5.3.190.0030.07715.55
5.3.180.0030.06715.55
5.3.170.0070.05315.55
5.3.160.0100.06315.55
5.3.150.0030.08315.55
5.3.140.0130.05715.55
5.3.130.0130.05315.55
5.3.120.0070.06715.55
5.3.110.0070.05315.55
5.3.100.0030.04715.55
5.3.90.0000.07015.55
5.3.80.0100.07315.55
5.3.70.0100.07015.55
5.3.60.0100.06715.55
5.3.50.0030.05015.55
5.3.40.0030.03715.55
5.3.30.0030.07715.55
5.3.20.0070.06315.55
5.3.10.0070.06315.55
5.3.00.0000.04715.55

preferences:
40.21 ms | 401 KiB | 5 Q