如何截取指定区间内的字符串.txt文件内容？

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php提取指定区间字符串的函数如下：

phpprivate function get_between($str, $start, $end) { $start=_entity_decode($start); $end=_entity_decode($end); $s1=strpos($str, $start); if ($s1===false) return ''; $str=substr($str, $s1 + strlen($start)); $e_leng=strpos($str, $end); if ($e_leng===false) return ''; return substr($str, 0, $e_leng);}

截取指定区间字符串.txt

private function get_between($str,$start = '',$end = '') { $start = html_entity_decode($start); $end = html_entity_decode($end); $s1 = strstr($str,$start); $str = $s1 ? $s1 : $str; $e_leng = strpos($str,$end); $str = substr($str,0,$e_leng); $str = str_replace($start,'',$str); return trim($str); }