fix(guide): simplify directory structure

guide/english/php/functions/files/file-reading/index.md

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+---
+title: File Reading
+---
+## File Reading
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/php/functions/files/reading/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->

guide/english/php/functions/files/file-uploading/index.md

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+---
+title: File Uploading
+---
+## File Uploading
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/php/functions/files/uploading/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->

guide/english/php/functions/files/file-writing/index.md

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+---
+title: File Writing
+---
+## File Writing
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/php/functions/files/writing/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->

guide/english/php/functions/files/index.md

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+---
+title: Files
+---
+## Files
+
+PHP provides several functions for working with files. These functions allow the developer to enable user file uploads, for php to read and use data from a file, and lastly for php to write data to a file.
+
+#### More Information:
+* <a href="https://secure.php.net/manual/en/function.readfile.php" rel="nofollow">php.net readfile() manual</a>
+* <a href="https://secure.php.net/manual/en/function.fopen.php" rel="nofollow">php.net fopen() manual</a>
+* <a href="https://secure.php.net/manual/en/function.fread.php" rel="nofollow">php.net fread() manual</a>
+* <a href="https://secure.php.net/manual/en/function.fclose.php" rel="nofollow">php.net fclose() manual</a>
+* <a href="https://secure.php.net/manual/en/function.fgets.php" rel="nofollow">php.net fgets() manual</a>
+* <a href="https://secure.php.net/manual/en/function.feof.php" rel="nofollow">php.net feof() manual</a>
+* <a href="https://secure.php.net/manual/en/function.fgetc.php" rel="nofollow">php.net fgetc() manual</a>