PHP fwrite() Function

Write to an open file:

<?php
$file = fopen("test.txt","w");
echo fwrite($file,"Hello World. Testing!");
fclose($file);
?>

The output of the code above will be:

Definition and Usage

The fwrite() writes to an open file.

The function will stop at the end of the file (EOF) or when it reaches the specified length, whichever comes first.

fwrite(file, string, length)

Parameter	Description
file	Required. Specifies the open file to write to
string	Required. Specifies the string to write to the open file
length	Optional. Specifies the maximum number of bytes to write

Return Value:	The number of bytes written, FALSE on failure
PHP Version:	4.0+
Binary Safe:	Yes