Differences Between plugins_url(‘aaa.php’) and plugins_url(‘aaa.php’, dirname(__FILE__)) in WordPress

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I’d like to know if there are differences in these two different usage of plugin_url(). They both produce the same string. 

echo plugins_url('aaa.php')

echo plugins_url('aaa.php', dirname(__FILE__));

When is one used and the other not?

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Thanks.

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  1. echo plugins_url('aaa.php')

    –> This is used for normal wordpress

    echo plugins_url('aaa.php', dirname(__FILE__));

    –> This is used for Multi network

    if you define dirname(__FILE__) in plugins_url function

    then it takes WordPress Multi Network Plugins url

    otherwise it takes Direct WordPress Plugin url