fopen() function opens a file, returns an integer, as a file handle.

 
Its syntax is: int fopen (string file, string mode [, int use_include_path])

The mode specifies the read/write readiness of the file. 

MODE         MEANING

r            Read only. 

r+           Reading and writing.

w            Write only.

w+           Reading and writing.

a            Write only.

a+           Reading and writing.


If use_include_path is set to 1, file path is compared to the include path contained in the php.ini file. 

<?
    $file = "data.txt";                                             // some file
    $fh = fopen($file, "a+") or die("File ($file) does not exist!");
?>

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() requires the file path and the mode in which the file is to be opened.
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() function opens a file, returns an integer, as a file handle. : fopen « File Directory « PHP

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