An Introduction to the WordPress Filesystem API

An excerpt from http://www.sitepoint.com/introduction-to-the-wordpress-filesystem-api/, by @narayanprusty

Writing to local files is one of the functionalities many plugins and themes need for various purposes. Security is the most important issue plugins and themes have to take care of while writing to local file systems. WordPress runs across various hosting services and configurations, therefore it becomes difficult for developers to create plugins and themes which access local file systems to work across all different kinds of environments without compromising security.

In this tutorial, we’ll learn how to use the WordPress Filesystem API to access local file systems which takes care of proper file permissions. In the process, we’ll create a plugin which displays a form with a textarea in an admin page that saves the content of the textarea to a file.

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