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($name) ) ); } function convert_case2($name) { $length = strlen($name); if ($length < 2) { return strtolower($name); } $output = ''; // init stream $prev_val = '_'; $prev_upr = false; $char_val = $name[0]; $char_upr = ctype_upper($char_val); for ($i = 0; $i < $length; $i++) { // peek $next_val = $i+1 < $length ? $name[$i+1] : '_'; $next_upr = ctype_upper($next_val); if ($prev_val == '_') { if ($char_val == '_') { continue; } $output .= $char_val; } else if ($char_upr !== $prev_upr) { $output .= '_'.$char_val; } else if ($char_upr && !$next_upr) { // && $prev_upr if ($prev_upr) { $output .= '_'.$char_val; $char_upr = false; } else { $output .= $char_val; } } else { $output .= $char_val; } // roll over $prev_val = $char_val; $prev_upr = $char_upr; $char_val = $next_val; $char_upr = $next_upr; } return strtolower($output); } 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)
8.3.60.0140.00316.75
8.3.50.0120.00321.98
8.3.40.0040.01118.82
8.3.30.0110.00319.21
8.3.20.0040.00420.38
8.3.10.0040.00421.95
8.3.00.0060.00317.79
8.2.180.0070.01016.75
8.2.170.0130.00322.96
8.2.160.0130.00020.11
8.2.150.0050.00324.18
8.2.140.0040.00424.66
8.2.130.0000.00726.16
8.2.120.0080.00021.09
8.2.110.0060.00322.17
8.2.100.0080.00318.22
8.2.90.0040.00419.40
8.2.80.0050.00317.97
8.2.70.0050.00317.63
8.2.60.0100.00017.93
8.2.50.0030.00718.07
8.2.40.0080.00017.97
8.2.30.0000.00718.21
8.2.20.0000.00817.75
8.2.10.0000.00818.18
8.2.00.0050.00317.77
8.1.280.0140.00725.92
8.1.270.0030.00622.01
8.1.260.0080.00026.35
8.1.250.0040.00428.09
8.1.240.0050.00322.06
8.1.230.0080.00419.22
8.1.220.0040.00417.74
8.1.210.0000.00818.77
8.1.200.0030.00617.38
8.1.190.0000.00817.23
8.1.180.0000.00818.10
8.1.170.0030.00618.51
8.1.160.0040.00421.95
8.1.150.0070.00018.81
8.1.140.0050.00217.52
8.1.130.0030.00317.87
8.1.120.0000.00817.50
8.1.110.0040.00417.46
8.1.100.0040.00417.36
8.1.90.0030.00317.53
8.1.80.0080.00017.50
8.1.70.0000.00717.47
8.1.60.0000.00817.49
8.1.50.0050.00317.54
8.1.40.0040.00417.55
8.1.30.0080.00017.66
8.1.20.0000.00817.55
8.1.10.0000.00717.58
8.1.00.0040.00417.41
8.0.300.0040.00418.77
8.0.290.0070.00016.75
8.0.280.0070.00018.46
8.0.270.0030.00517.14
8.0.260.0040.00417.36
8.0.250.0000.00717.00
8.0.240.0030.00617.01
8.0.230.0030.00316.86
8.0.220.0030.00316.80
8.0.210.0000.00716.91
8.0.200.0040.00416.98
8.0.190.0000.00716.97
8.0.180.0040.00416.93
8.0.170.0040.00416.93
8.0.160.0000.00816.85
8.0.150.0040.00416.75
8.0.140.0000.00716.84
8.0.130.0000.00513.36
8.0.120.0040.00416.83
8.0.110.0000.00816.98
8.0.100.0040.00416.92
8.0.90.0040.00416.71
8.0.80.0060.00916.80
8.0.70.0080.00016.81
8.0.60.0050.00216.94
8.0.50.0040.00416.95
8.0.30.0100.00916.98
8.0.20.0150.00517.42
8.0.10.0070.00016.89
8.0.00.0090.00916.67
7.4.330.0050.00015.14
7.4.320.0030.00316.52
7.4.300.0030.00316.58
7.4.290.0000.00716.54
7.4.280.0070.00316.52
7.4.270.0040.00416.52
7.4.260.0000.00716.52
7.4.250.0040.00416.50
7.4.240.0020.00716.45
7.4.230.0030.00316.55
7.4.220.0060.02016.73
7.4.210.0090.00616.43
7.4.200.0050.00316.50
7.4.160.0040.01216.60
7.4.150.0070.01117.40
7.4.140.0090.00917.86
7.4.130.0170.00016.40
7.4.120.0170.00316.33
7.4.110.0110.01116.52
7.4.100.0100.01016.60
7.4.90.0080.00916.53
7.4.80.0140.00719.39
7.4.70.0100.01016.47
7.4.60.0150.00916.45
7.4.50.0000.00516.59
7.4.40.0130.00316.53
7.4.30.0080.00816.56
7.4.10.0070.01114.68
7.4.00.0080.00814.90
7.3.330.0000.00613.39
7.3.320.0050.00013.45
7.3.310.0000.00716.29
7.3.300.0070.00016.43
7.3.290.0040.01116.36
7.3.280.0140.00716.35
7.3.270.0060.01217.40
7.3.260.0100.00716.45
7.3.250.0160.00616.53
7.3.240.0080.01116.44
7.3.230.0060.01016.39
7.3.210.0030.01416.48
7.3.200.0100.00719.39
7.3.190.0100.00716.39
7.3.180.0070.01316.37
7.3.170.0110.00516.42
7.3.160.0090.00616.38
7.3.130.0110.00715.17
7.3.120.0130.00314.83
7.3.110.0070.01014.89
7.3.100.0060.00914.99
7.3.90.0060.00914.70
7.3.80.0090.00015.13
7.3.70.0000.01214.54
7.3.60.0050.00814.90
7.3.50.0090.00014.68
7.3.40.0000.01314.93
7.3.30.0000.01514.56
7.3.20.0040.00416.76
7.3.10.0070.00716.79
7.3.00.0030.01416.72
7.2.330.0040.01816.84
7.2.320.0090.00916.60
7.2.310.0090.00616.87
7.2.300.0040.01516.76
7.2.290.0060.01016.52
7.2.260.0130.00714.70
7.2.250.0060.01214.97
7.2.240.0070.00714.62
7.2.230.0070.01015.08
7.2.220.0060.00914.70
7.2.210.0030.01315.29
7.2.200.0000.01414.90
7.2.190.0040.01115.20
7.2.180.0110.00414.95
7.2.170.0090.00315.00
7.2.160.0090.00615.04
7.2.150.0040.01217.09
7.2.140.0000.01217.11
7.2.130.0120.00316.96
7.2.120.0030.01416.86
7.2.110.0130.00317.04
7.2.100.0080.00417.00
7.2.90.0070.00716.88
7.2.80.0090.00616.91
7.2.70.0080.00417.13
7.2.60.0070.00716.91
7.2.50.0000.00916.93
7.2.40.0030.00917.03
7.2.30.0080.00417.06
7.2.20.0040.00817.01
7.2.10.0150.00316.77
7.2.00.0030.00717.07
7.1.330.0100.00315.79
7.1.320.0100.00315.94
7.1.310.0070.01016.11
7.1.300.0030.01015.85
7.1.290.0040.00415.84
7.1.280.0100.00315.84
7.1.270.0060.00615.98
7.1.260.0070.00716.04
7.1.250.0100.00315.85
7.1.240.0040.01115.78
7.1.230.0040.01115.69
7.1.220.0060.00615.61
7.1.210.0030.00715.95
7.1.200.0000.01115.81
7.1.190.0030.01015.97
7.1.180.0030.00715.98
7.1.170.0030.00915.86
7.1.160.0100.00315.76
7.1.150.0080.00815.75
7.1.140.0070.00715.97
7.1.130.0000.01315.84
7.1.120.0030.00715.82
7.1.110.0080.00415.61
7.1.100.0060.00615.80
7.1.90.0000.01415.74
7.1.80.0100.00315.88
7.1.70.0010.00716.60
7.1.60.0080.00517.59
7.1.50.0040.00916.30
7.1.40.0040.01415.82
7.1.30.0040.00715.66
7.1.20.0040.01415.80
7.1.10.0100.00015.77
7.1.00.0080.04019.01
7.0.330.0030.00715.50
7.0.320.0080.00415.36
7.0.310.0120.00415.46
7.0.300.0030.01015.35
7.0.290.0040.00415.18
7.0.280.0000.01315.41
7.0.270.0060.00315.13
7.0.260.0030.01315.48
7.0.250.0000.01115.56
7.0.240.0060.00315.40
7.0.230.0110.00415.40
7.0.220.0060.00915.37
7.0.210.0080.00415.55
7.0.200.0020.00616.02
7.0.190.0090.00315.29
7.0.180.0090.00015.31
7.0.170.0130.00315.56
7.0.160.0030.00615.22
7.0.150.0070.00715.16
7.0.140.0040.04218.77
7.0.130.0000.01415.51
7.0.120.0100.00715.32
7.0.110.0280.04217.74
7.0.100.0400.04417.69
7.0.90.0380.04717.57
7.0.80.0380.04417.83
7.0.70.0400.03517.78
7.0.60.0500.03517.78
7.0.50.0430.02317.72
7.0.40.0080.04216.77
7.0.30.0080.03616.68
7.0.20.0030.03816.58
7.0.10.0030.04816.54
7.0.00.0120.03716.71
5.6.400.0040.00714.45
5.6.390.0040.00714.71
5.6.380.0070.00714.65
5.6.370.0030.01214.36
5.6.360.0030.01514.44
5.6.350.0030.00814.45
5.6.340.0040.00814.13
5.6.330.0000.01014.27
5.6.320.0100.00614.40
5.6.310.0030.00914.65
5.6.300.0080.00814.41
5.6.290.0070.01114.13
5.6.280.0050.04117.48
5.6.270.0040.00814.72
5.6.260.0020.03217.62
5.6.250.0100.03317.51
5.6.240.0050.04117.42
5.6.230.0100.03117.53
5.6.220.0060.03317.61
5.6.210.0100.04617.60
5.6.200.0080.04217.58
5.6.190.0060.04417.46
5.6.180.0080.03317.42
5.6.170.0080.04717.41
5.6.160.0030.04417.42
5.6.150.0050.03017.57
5.6.140.0100.04017.57
5.6.130.0020.04617.59
5.6.120.0080.04117.51
5.6.110.0050.04717.56
5.6.100.0150.04117.45
5.6.90.0100.04017.44
5.6.80.0140.03317.19
5.6.70.0060.04617.32
5.6.60.0070.04317.18
5.6.50.0100.04217.07
5.6.40.0070.04317.15
5.6.30.0050.04617.08
5.6.20.0030.04317.19
5.6.10.0110.04317.12
5.6.00.0090.03917.14
5.5.380.0070.03417.48
5.5.370.0100.04217.27
5.5.360.0080.04517.26
5.5.350.0080.03517.50
5.5.340.0100.04117.57
5.5.330.0060.04017.78
5.5.320.0080.04317.68
5.5.310.0030.04017.50
5.5.300.0100.02517.69
5.5.290.0080.04117.53
5.5.280.0070.04317.50
5.5.270.0050.04717.62
5.5.260.0030.04817.76
5.5.250.0100.04017.59
5.5.240.0050.04717.22
5.5.230.0080.04317.29
5.5.220.0050.04117.37
5.5.210.0090.04017.24
5.5.200.0080.04117.30
5.5.190.0070.04317.22
5.5.180.0100.03917.08
5.5.170.0030.01514.27
5.5.160.0090.04317.30
5.5.150.0030.03317.22
5.5.140.0080.04317.29
5.5.130.0070.03917.32
5.5.120.0120.02017.16
5.5.110.0050.04517.33
5.5.100.0050.02217.31
5.5.90.0070.02817.35
5.5.80.0140.03917.18
5.5.70.0090.02517.22
5.5.60.0070.04117.24
5.5.50.0100.03817.19
5.5.40.0080.03617.22
5.5.30.0080.04317.41
5.5.20.0050.04317.07
5.5.10.0110.03917.32
5.5.00.0080.04517.32
5.4.450.0050.03515.32
5.4.440.0070.04415.42
5.4.430.0110.02715.21
5.4.420.0080.04015.26
5.4.410.0040.04015.07
5.4.400.0050.04015.25
5.4.390.0050.03715.24
5.4.380.0060.04415.09
5.4.370.0090.04015.16
5.4.360.0060.04115.18
5.4.350.0070.04015.21
5.4.340.0080.04015.04
5.4.330.0090.00610.95
5.4.320.0110.03315.01
5.4.310.0070.03915.41
5.4.300.0030.04215.07
5.4.290.0050.02715.02
5.4.280.0080.04415.13
5.4.270.0000.04615.04
5.4.260.0060.04015.11
5.4.250.0070.04115.11
5.4.240.0020.04915.10
5.4.230.0040.04015.15
5.4.220.0050.04415.05
5.4.210.0020.04615.31
5.4.200.0080.04015.13
5.4.190.0070.04015.07
5.4.180.0070.04015.27
5.4.170.0020.04515.18
5.4.160.0100.02215.30
5.4.150.0020.04915.15
5.4.140.0090.04213.79
5.4.130.0070.03613.69
5.4.120.0100.03213.94
5.4.110.0080.03713.62
5.4.100.0070.03513.80
5.4.90.0050.04213.73
5.4.80.0030.04013.74
5.4.70.0080.03013.93
5.4.60.0050.04213.81
5.4.50.0070.03413.69
5.4.40.0080.03613.86
5.4.30.0040.04013.70
5.4.20.0080.03713.72
5.4.10.0050.04313.86
5.4.00.0080.03813.32
5.3.290.0070.03812.73
5.3.280.0070.04512.63
5.3.270.0040.03912.71
5.3.260.0050.04512.77
5.3.250.0090.03312.64
5.3.240.0050.03912.62
5.3.230.0060.02412.66
5.3.220.0050.04012.52
5.3.210.0100.03812.56
5.3.200.0060.04112.56
5.3.190.0090.03512.54
5.3.180.0050.02512.61
5.3.170.0020.04112.61
5.3.160.0020.04512.55
5.3.150.0070.02212.55
5.3.140.0030.04112.62
5.3.130.0070.03912.64
5.3.120.0040.04312.59
5.3.110.0020.04312.60
5.3.100.0070.03412.32
5.3.90.0060.03912.31
5.3.80.0080.03612.27
5.3.70.0030.04512.12
5.3.60.0050.03812.28
5.3.50.0080.03712.27
5.3.40.0050.04112.31
5.3.30.0050.03112.27
5.3.20.0060.04112.19
5.3.10.0050.03812.06
5.3.00.0070.03011.98
5.2.170.0000.07011.98
5.2.160.0070.06311.98
5.2.150.0070.06011.98
5.2.140.0000.07011.98
5.2.130.0100.04711.98
5.2.120.0070.06011.98
5.2.110.0070.06011.98
5.2.100.0100.05011.98
5.2.90.0030.05711.98
5.2.80.0070.03311.98
5.2.70.0030.06711.98
5.2.60.0130.05311.98
5.2.50.0070.05711.98
5.2.40.0170.05711.98
5.2.30.0000.03311.98
5.2.20.0030.02711.98
5.2.10.0070.02311.98
5.2.00.0130.05011.98
5.1.60.0030.03311.98
5.1.50.0030.05711.98
5.1.40.0000.04711.98
5.1.30.0000.05711.98
5.1.20.0070.05311.98
5.1.10.0100.04711.98
5.1.00.0000.02311.98
5.0.50.0070.04011.98
5.0.40.0030.04311.98
5.0.30.0000.03011.98
5.0.20.0030.04711.98
5.0.10.0030.02711.98
5.0.00.0030.06311.98
4.4.90.0030.02311.98
4.4.80.0070.03011.98
4.4.70.0070.02711.98
4.4.60.0070.03011.98
4.4.50.0030.03011.98
4.4.40.0070.05011.98
4.4.30.0070.02311.98
4.4.20.0070.03311.98
4.4.10.0070.03011.98
4.4.00.0000.05311.98
4.3.110.0030.03011.98
4.3.100.0030.03011.98
4.3.90.0000.03011.98
4.3.80.0070.05011.98
4.3.70.0000.03311.98
4.3.60.0030.03011.98
4.3.50.0070.03011.98
4.3.40.0100.04311.98
4.3.30.0000.03711.98
4.3.20.0000.03711.98
4.3.10.0000.02711.98
4.3.00.0000.03311.98

preferences:
38.63 ms | 401 KiB | 5 Q