PHP reference

fwrite

Writes a string to an open file.

Syntax

fwrite(resource $stream, string $data, ?int $length = null): int|false

Parameters

Parameter	Type	Description
$stream	resource	A file opened for writing.
$data	string	The data to write.
$length	?int	Optional. The maximum number of bytes.

Return value

int|falseThe number of bytes written, or `false`.

Examples

Writing several lines:

<?php
 
$file = sys_get_temp_dir() . '/ref-fwrite.txt';
$handle = fopen($file, 'w');
 
foreach (['tea', 'coffee', 'juice'] as $item) {
    fwrite($handle, $item . "\n");
}
 
fclose($handle);
 
echo file_get_contents($file);

Output:

tea
coffee
juice

Notes

The 'w' mode erases the file, 'a' appends to the end. For a single write file_put_contents() is simpler.

Related recipes

How to append a line to a file

In the tutorial

Reading and writing files — Working with files in PHP — writing, reading, appending, reading line by line, checking existence and deleting.

Thanks for reading!