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fwrite — Writes data to a file.


string fwrite(file_handle, data[, bytes]);
resource file_handle: File handle
string data: Data to be written
int bytes (optional): Number of bytes to write


TRUE on success; FALSE on failure


fwrite() writes the data given in data to the specified file. The optional bytes argument denotes the maximum number of bytes to be written to the file (useful if you don't want to dump all of the data contained in the data string). If you're using the bytes parameter, the configuration value of"magic_quotes_runtime"is ignored and no slashes are stripped from data . This function is binary-safe, so binary data (such as an image) can be written as well as text.


Because some of the filesystem functions to read/write from files partially share the same code, one or more of the bugs reported elsewhere may also apply to this function.

3.0.11: Reported to work unreliably on Linux (not verified).


Example 328. Write data to a file

$string = "Hello World!\n";
$file = "test.txt";

$fh = fopen($file, "w");
fwrite($fh, $string);

echo ("Wrote \"$string\" to file $file");

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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