File Directory Php

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  4. 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!");
?>