fopen() requires the file path and the mode in which the file is to be opened.

 
The most common modes are read ('r'), write ('w'), and append ('a'). 
fopen() returns a file resource you will later use to work with the open file. 
To open a file for reading, you would use the following:

$fp = fopen( "test.txt", 'r' );


You would use the following to open a file for writing:


$fp = fopen( "test.txt", 'w' );


To open a file for appending, you would use this:


$fp = fopen( "test.txt", 'a' );

1.	Acceptable fopen() Modes
2.	Calling fopen() with a Context Resource
3.	Opening a file
4.	Opening a file on Windows
5.	Opening a remote file
6.	Opening files in the include_path
7.	Using fopen( )
8.	Using the fopen() Function
9.	File open with exception checking
10.	Getting and Printing a Web Page with fopen()
11.	Getting and Putting Files with FTP
12.	Reading a File with fread()
13.	Reading from standard input
14.	If you are writing a binary file on a Windows system, you should add a 'b' flag.
15.	Load remote file
16.	Open a connection with the PHP site (http://www.php.net):
17.	Opening Files
18.	fopen() function opens a file, returns an integer, as a file handle.
19.	fopen() returns false if the file cannot be opened for any reason.
20.	PHP 5 Arguments for Opening a File
21.	Safely reading a binary file

fopen() requires the file path and the mode in which the file is to be opened. : fopen « File Directory « PHP

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