PHP set_include_path

Question

I have a MainClass.php file with other .php files in the same directory. I noticed that I can include other .php files inside this file by using:

require "file.php";

and it seems to load them even if I don't specify the full path to the script. Will this work on any server setup? Or do I have to manually add the full path or change the include path:

set_include_path(dirname(__FILE__));

before the require statements

?

Phil · Accepted Answer · 2011-09-07 01:49:35Z

3

By default, PHP's include path includes .. This represents the current working directory (CWD) which is why your includes are working.

I think it best to play it safe and use an explicit include path or absolute paths wherever possible as indicated in your question.

A popular method is

set_include_path(implode(PATH_SEPARATOR, array(
    $applicationIncludePath,
    get_include_path()
));

edited Sep 7, 2011 at 1:49

answered Sep 7, 2011 at 1:41

Phil

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2 Comments

Emm Over a year ago

by default? does that mean that the server admin can change this setting?

Phil Over a year ago

@Emm That's correct. The include path does not need to include . and may be configured without it

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