PHP采集利器：根据开始字符串和结束字符串截取需要的采集内容数据，纯PHP函数高性能实现，支持多种字符编码格式

function strCutByStr(&$str, $findStart, $findEnd = false, $encoding = 'utf-8'){
		if(is_array($findStart)){
			if(count($findStart) === count($findEnd)){
				foreach($findStart as $k => $v){
					if(($result = strCutByStr($str, $v, $findEnd[$k], $encoding)) !== false){
						return $result;
					}
				}
				return false;
			}else{
				return false;
			}
		}
		
		if(($start = mb_strpos($str, $findStart, 0, $encoding)) === false){
			return false;
		}
		
		$start += mb_strlen($findStart, $encoding);
		
		if($findEnd === false){
			return mb_substr($str, $start, NULL, $encoding);
		}
		
		if(($length = mb_strpos($str, $findEnd, $start, $encoding)) === false){
			return false;
		}
		
		return mb_substr($str, $start, $length - $start, $encoding);
	}