<?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));
preferences:
31.09 ms | 402 KiB | 5 Q