PHP驼峰转下划线

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/**  * @notes: 驼峰转下划线  * @param string|null $string  * @return string  */ function convert_to_underscore(string|null $string) {     if (empty($string)) {         return '';     }     $pattern     = '/([a-z])([A-Z])/';     $replacement = '${1}_${2}';     return strtolower(preg_replace($pattern, $replacement, $string)); }