/**
* Callback function for array_walk use.
*
* @param $string
*/
protected function trimCallback(&$string)
{
$string = UTF8::trim($string);
}
/**
* Convert a string to e.g.: "snake_case"
*
* @return Stringy Object with $str in snake_case
*/
public function snakeize()
{
$str = $this->str;
$encoding = $this->encoding;
$str = UTF8::normalize_whitespace($str);
$str = str_replace('-', '_', $str);
$str = preg_replace_callback('/([\\d|A-Z])/u', function ($matches) use($encoding) {
$match = $matches[1];
$matchInt = (int) $match;
if ("{$matchInt}" == $match) {
return '_' . $match . '_';
} else {
return '_' . UTF8::strtolower($match, $encoding);
}
}, $str);
$str = preg_replace(array('/\\s+/', '/^\\s+|\\s+$/', '/_+/'), array('_', '', '_'), $str);
$str = UTF8::trim($str, '_');
// trim leading & trailing "_"
$str = UTF8::trim($str);
// trim leading & trailing whitespace
return static::create($str, $this->encoding);
}