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                ``` /** * 駝峰命名轉下劃線命名 * @param $str * @return string */ function toUnderScore($str) { $dstr = preg_replace_callback('/([A-Z]+)/', function ($matchs) { return '_' . strtolower($matchs[0]); }, $str); return trim(preg_replace('/_{2,}/', '_', $dstr), '_'); ```
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