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 && $next_val !== '_') { // && $prev_upr $output .= $char_val.'_'; $char_val = '_'; $char_upr = false; } 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)
8.3.60.0040.01116.63
8.3.50.0100.01121.99
8.3.40.0180.00318.80
8.3.30.0090.00619.07
8.3.20.0040.00420.33
8.3.10.0040.00421.92
8.3.00.0000.00818.04
8.2.180.0070.01416.38
8.2.170.0100.01022.96
8.2.160.0030.01020.37
8.2.150.0040.00424.18
8.2.140.0000.00824.66
8.2.130.0040.00426.16
8.2.120.0040.00421.02
8.2.110.0060.00322.08
8.2.100.0080.00419.63
8.2.90.0050.00319.40
8.2.80.0000.00817.97
8.2.70.0040.00417.48
8.2.60.0060.00317.93
8.2.50.0060.00618.07
8.2.40.0050.00318.34
8.2.30.0000.00718.43
8.2.20.0050.00317.87
8.2.10.0040.00418.06
8.2.00.0060.00317.69
8.1.280.0060.00925.92
8.1.270.0080.00022.08
8.1.260.0060.00326.35
8.1.250.0040.00428.09
8.1.240.0030.00623.70
8.1.230.0030.00719.01
8.1.220.0000.00817.74
8.1.210.0060.00318.77
8.1.200.0070.00317.35
8.1.190.0000.00817.35
8.1.180.0060.00318.10
8.1.170.0000.00818.71
8.1.160.0070.00022.07
8.1.150.0050.00318.85
8.1.140.0050.00217.46
8.1.130.0030.00317.84
8.1.120.0000.00717.43
8.1.110.0040.00417.47
8.1.100.0050.00317.52
8.1.90.0040.00417.58
8.1.80.0040.00417.42
8.1.70.0070.00017.45
8.1.60.0050.00517.64
8.1.50.0060.00317.47
8.1.40.0040.00417.57
8.1.30.0040.00417.75
8.1.20.0000.00717.66
8.1.10.0040.00417.64
8.1.00.0030.00617.53
8.0.300.0040.00418.77
8.0.290.0000.00716.61
8.0.280.0000.00718.51
8.0.270.0000.00717.27
8.0.260.0030.00317.23
8.0.250.0080.00017.02
8.0.240.0000.00816.91
8.0.230.0000.00717.06
8.0.220.0070.00016.80
8.0.210.0030.00316.83
8.0.200.0040.00416.90
8.0.190.0020.00517.04
8.0.180.0000.00716.98
8.0.170.0060.00316.96
8.0.160.0000.00716.98
8.0.150.0040.00416.86
8.0.140.0000.00716.92
8.0.130.0030.00313.41
8.0.120.0040.00416.90
8.0.110.0000.00816.85
8.0.100.0070.00016.80
8.0.90.0000.00716.99
8.0.80.0150.00016.90
8.0.70.0040.00416.93
8.0.60.0000.00716.80
8.0.50.0080.00016.91
8.0.30.0130.00917.02
8.0.20.0110.00817.40
8.0.10.0070.00016.96
8.0.00.0100.00816.80
7.4.330.0030.00315.01
7.4.320.0000.00616.66
7.4.300.0030.00316.55
7.4.290.0000.00916.42
7.4.280.0080.00316.45
7.4.270.0000.00816.70
7.4.260.0050.00316.69
7.4.250.0040.00416.62
7.4.240.0020.00516.64
7.4.230.0030.00316.55
7.4.220.0060.02016.53
7.4.210.0000.01416.61
7.4.200.0000.00716.74
7.4.160.0110.00516.39
7.4.150.0060.01317.40
7.4.140.0130.00317.86
7.4.130.0140.00516.72
7.4.120.0130.01116.64
7.4.110.0070.01116.45
7.4.100.0120.00616.64
7.4.90.0060.01116.59
7.4.80.0120.01219.39
7.4.70.0030.01316.66
7.4.60.0080.00816.52
7.4.50.0030.00316.37
7.4.40.0100.00716.33
7.4.30.0030.01316.46
7.4.00.0070.00714.76
7.3.330.0000.00513.23
7.3.320.0020.00213.20
7.3.310.0030.00316.40
7.3.300.0030.00316.40
7.3.290.0030.01516.50
7.3.280.0120.00916.36
7.3.270.0080.00817.40
7.3.260.0080.00816.64
7.3.250.0100.00816.33
7.3.240.0150.00916.32
7.3.230.0100.00716.65
7.3.210.0150.00316.59
7.3.200.0090.01219.39
7.3.190.0080.01616.41
7.3.180.0080.00816.49
7.3.170.0090.00616.52
7.3.160.0120.00416.64
7.3.120.0040.01115.03
7.2.330.0100.00716.63
7.2.320.0070.01016.63
7.2.310.0060.01016.59
7.2.300.0060.01116.61
7.2.290.0100.01016.77
7.2.60.0090.00616.79
7.2.50.0070.00717.21
7.1.200.0060.00015.83
7.1.70.0080.00017.23
7.1.60.0070.00319.25
7.1.50.0040.00816.95
7.1.00.0000.07722.52
7.0.200.0050.00216.91
7.0.140.0100.07021.92
7.0.60.0070.04720.04
7.0.50.0100.07317.74
7.0.40.0070.04720.24
7.0.30.0370.06320.12
7.0.20.0230.09020.02
7.0.10.0070.08020.07
7.0.00.0030.06720.08
5.6.280.0130.06320.93
5.6.210.0200.07020.79
5.6.200.0100.08318.16
5.6.190.0030.07320.52
5.6.180.0230.03320.63
5.6.170.0200.06020.50
5.6.160.0130.08020.55
5.6.150.0030.08718.15
5.6.140.0100.04018.18
5.6.130.0130.04318.21
5.6.120.0170.07321.00
5.6.110.0070.09020.98
5.6.100.0100.06321.11
5.6.90.0070.06721.02
5.6.80.0100.05320.44
5.5.350.0330.06720.43
5.5.340.0130.05017.94
5.5.330.0070.03720.13
5.5.320.0270.03720.34
5.5.310.0300.07720.26
5.5.300.0070.03718.02
5.5.290.0070.05317.98
5.5.280.0070.08320.89
5.5.270.0100.08020.78
5.5.260.0070.08020.66
5.5.250.0030.06020.56
5.5.240.0070.03720.20
5.4.450.1600.05319.33
5.4.440.1670.05019.31
5.4.430.1500.03719.16
5.4.420.1630.04719.36
5.4.410.1430.03319.07
5.4.400.1100.05719.20
5.4.390.1600.04719.08
5.4.380.1600.04319.16
5.4.370.1630.05319.09
5.4.360.1370.04018.87
5.4.350.1570.05019.18
5.4.340.1670.05018.87
5.4.320.1670.04019.23
5.4.310.1570.04019.20
5.4.300.1800.04719.19
5.4.290.1570.03318.88
5.4.280.1500.04019.16
5.4.270.1700.04019.16
5.4.260.1530.03718.84
5.4.250.1800.04319.05
5.4.240.0470.06019.01
5.4.230.0130.06719.21
5.4.220.0000.04318.86
5.4.210.0300.03718.98
5.4.200.1700.04018.97
5.4.190.1530.03719.21
5.4.180.1830.04319.15
5.4.170.1870.03019.00
5.4.160.1570.03719.06
5.4.150.1500.04019.19
5.4.140.1570.03316.49
5.4.130.1830.04016.35
5.4.120.1530.03316.40
5.4.110.1670.04016.35
5.4.100.1670.05016.59
5.4.90.1730.05016.30
5.4.80.1770.04716.43
5.4.70.1630.03316.62
5.4.60.1670.03316.44
5.4.50.1630.03716.24
5.4.40.1530.03316.54
5.4.30.1870.04016.52
5.4.20.1600.04716.51
5.4.10.1530.03316.48
5.4.00.1500.03315.80
5.3.290.1500.03714.66
5.3.280.1770.05014.66
5.3.270.1800.04014.74
5.3.260.1800.03314.77
5.3.250.1700.04014.64
5.3.240.1770.04714.64
5.3.230.1770.04314.59
5.3.220.1500.04014.50
5.3.210.1570.03314.51
5.3.200.1800.03314.52
5.3.190.1530.04014.60
5.3.180.1670.04714.57
5.3.170.1470.04314.57
5.3.160.1400.04014.49
5.3.150.1530.03714.66
5.3.140.0000.04714.48
5.3.130.0100.03314.48
5.3.120.0070.03314.63
5.3.110.1270.04014.70
5.3.100.1370.03714.00
5.3.90.1370.03714.27
5.3.80.1700.04014.04
5.3.70.1530.03314.04
5.3.60.1430.04014.27
5.3.50.1530.03713.88
5.3.40.1830.03714.02
5.3.30.1700.04313.84
5.3.20.1600.03313.57
5.3.10.1570.04313.92
5.3.00.1730.03013.66
5.2.170.0470.03311.24
5.2.160.0030.02711.28
5.2.150.0000.03011.08
5.2.140.0070.02711.14
5.2.130.0730.03011.04
5.2.120.1000.02311.27
5.2.110.1170.02711.02
5.2.100.1130.02711.07
5.2.90.1130.03711.19
5.2.80.1270.03011.28
5.2.70.1230.04011.25
5.2.60.1270.02710.97
5.2.50.1070.03011.11
5.2.40.1070.02311.13
5.2.30.0970.03310.90
5.2.20.0930.03010.90
5.2.10.1230.02710.80
5.2.00.0900.04010.82
5.1.60.0900.0309.87
5.1.50.0900.02010.18
5.1.40.0970.0239.97
5.1.30.1000.02310.33
5.1.20.0930.02710.32
5.1.10.0930.02710.21
5.1.00.1000.0339.97
5.0.50.0500.0178.46
5.0.40.0530.0238.32
5.0.30.0600.0478.22
5.0.20.0570.0308.10
5.0.10.0370.0208.09
5.0.00.0500.0308.43
4.4.90.0630.0207.66
4.4.80.0430.0207.66
4.4.70.0470.0177.66
4.4.60.0470.0177.66
4.4.50.0500.0137.66
4.4.40.0500.0237.66
4.4.30.0670.0177.66
4.4.20.0430.0107.66
4.4.10.0430.0177.66
4.4.00.0500.0277.66
4.3.110.0570.0137.66
4.3.100.0600.0137.66
4.3.90.0530.0137.66
4.3.80.0630.0277.66
4.3.70.0700.0207.66
4.3.60.0500.0177.66
4.3.50.0500.0177.66
4.3.40.0630.0337.66
4.3.30.0270.0207.66
4.3.20.0370.0277.66
4.3.10.0270.0177.66
4.3.00.0300.0277.66

preferences:
37.89 ms | 401 KiB | 5 Q