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# fwrite

(PHP 3, PHP 4, PHP 5)

fwrite -- Binary-safe file write

## Description

int fwrite ( resource handle, string string [, int length] )

fwrite() writes the contents of `string` to the file stream pointed to by `handle`. If the `length` argument is given, writing will stop after `length` bytes have been written or the end of `string` is reached, whichever comes first.

fwrite() returns the number of bytes written, or `FALSE` on error.

Note that if the `length` argument is given, then the magic_quotes_runtime configuration option will be ignored and no slashes will be stripped from `string`.

> Note: On systems which differentiate between binary and text files (i.e. Windows) the file must be opened with 'b' included in fopen() mode parameter.

> Note: If `handle` was fopen()ed in append mode, fwrite()s are atomic (unless the size of `string` exceeds the filesystem's block size, on some platforms, and as long as the file is on a local filesystem). That is, there is no need to flock() a resource before calling fwrite(); all of the data will be written without interruption.

Example 1. A simple fwrite() example

`<?php
$filename = 'test.txt';
$somecontent = "Add this to the file\n";
// Let's make sure the file exists and is writable first.
if (is_writable($filename)) {
// In our example we're opening $filename in append mode.
// The file pointer is at the bottom of the file hence
// that's where $somecontent will go when we fwrite() it.
if (!$handle = fopen($filename, 'a')) {
echo "Cannot open file ($filename)";
exit;
}
// Write $somecontent to our opened file.
if (fwrite($handle, $somecontent) === FALSE) {
echo "Cannot write to file ($filename)";
exit;
}
echo "Success, wrote ($somecontent) to file ($filename)";
fclose($handle);
} else {
echo "The file $filename is not writable";
}
?>`

See also fread(), fopen(), fsockopen(), popen(), and file_put_contents().

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