fopen() returns false if the file cannot be opened for any reason.

 
if ( $fp = fopen( "test.txt", "w" ) ) {
  // do something with $fp
}

Or you can use a logical operator to end execution if an essential file can't be opened:


( $fp = fopen( "test.txt", "w" ) ) or die ("Couldn't open file, sorry");

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() requires the file path and the mode in which the file is to be opened.
20.	PHP 5 Arguments for Opening a File
21.	Safely reading a binary file

fopen() returns false if the file cannot be opened for any reason. : fopen « File Directory « PHP

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