Added 2 File reading functions (#30120)

* Added 2 reading functions

Added :  fopen for reading, fread function and file_get_contents function.

* Update index.md

* Update index.md

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

@@ -3,11 +3,43 @@ 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>.
+PHP prepared File Reading functions to ease user to only retrieve information outside PHP.
 
-<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>.
+### fopen("fileName.txt", "r")
+Before we read a file, we need to prepare the file in PHP using fopen function reading mode("r"). The $fileHandler will be the file handler variable in the file reading operation.
+```PHP
+<?php
 
-<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+$fileHandler = fopen("fileName.txt", "r");
+
+?>
+```
+
+### fread()
+After the desired file to be read has been prepared for reading, user can proceed to fread function to read contents of the file.
+```PHP
+<?php
+
+$content = fread($fileHandler, filesize("fileName.txt"));
+
+?>
+```
+Content in the file "file.txt" will be stored in the variable $content.
+
+### file_get_contents()
+This file reading function is rather easy. This function doesn't need the file to be prepare by fopen().
+
+```PHP
+<?php
+
+$content = file_get_contents("fileName.txt");
+
+?>
+```
 
 #### More Information:
 <!-- Please add any articles you think might be helpful to read before writing the article -->
+- [fopen Function](http://php.net/manual/en/function.fopen.php)
+- [fread](http://php.net/manual/en/function.fread.php)
+- [filesize](http://php.net/manual/en/function.filesize.php)
+- [file_get_contents](http://php.net/manual/en/function.file-get-contents.php)