dtf0925
2017-09-27 07:21
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Php在file_get_contents中不清楚$ use_include_path的定义

As I was looking on http://php.net/manual/en/function.file-get-contents.php for the file_get_contents function, I noticed that it takes an optional second parameter named $use_include_path but I cannot understand what is the use and how changes the file_get_contents behavior.

Can you provide me an example in order to understand it better?

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正如我在查看 file_get_contents 的file-get-contents.php“rel =”nofollow noreferrer“> http://php.net/manual/en/function.file-get-contents.php 函数,我注意到它需要一个名为 $ use_include_path 的可选第二个参数,但是我无法理解它是什么用途以及如何更改 file_get_contents 行为。 \ 你可以给我一个例子来更好地理解它吗?

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  • donglian1982 2017-09-27 07:31
    最佳回答

    For example, I have file /tmp/code.txt and I need to get contents of this file, I can write something like:

    var_dump(file_get_contents('code.txt'));
    

    but it will fall with error (No such file or directory), hence I have to profile full path to file, but in case I don't want to do it, I can write something like:

    set_include_path(get_include_path() . PATH_SEPARATOR . '/tmp/');
    var_dump(file_get_contents('code.txt', FILE_USE_INCLUDE_PATH));
    

    and it will work!

    It is very useful in case you have library or sub-project or you mount your sub-project into another project or you have SDK or something else...
    and you can have set_include_path in your bootstrap script for your module/library/whatever but in your code, you have only clear usage of particular files without full path, only relative...

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