It reads the XML file contents and returns a string to the caller.
它读取XML文件内容并向调用者返回一个字符串。
Please be advised that this function returns a string and not XML.
请注意此函数返回的是一个字符串,而非 XML。
The mysqli_error function returns a string description of the last error.
mysqli_error函数返回最近的错误的字符串描述。
NULL If a get string returns null, that pretty much means something went wrong and there are a few things that could go wrong.
如果GetSting返回,大致上表示的是出错了,这里有几种出错的地方。
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