SplFileObject::fwrite

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

SplFileObject::fwrite — Write to file

public SplFileObject::fwrite(string $data, int $length = 0): int|false

Writes the contents of string to the file

data: The string to be written to the file.
length: 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.

Returns the number of bytes written, or false on error.

版本	说明
7.4.0	The function now returns `false` instead of zero on failure.

示例 #1 SplFileObject::fwrite() example

<?php
$file = new SplFileObject("fwrite.txt", "w");
$written = $file->fwrite("12345");
echo "Wrote $written bytes to file";
?>

以上示例的输出类似于：

Wrote 5 bytes to file