Function safe_file_write

Writes data to a file, optionally making a backup, while avoiding race conditions.

Package: SMF
Copyright: 2020 Simple Machines and individual contributors
License: BSD
Author: Simple Machines https://www.simplemachines.org
Located at Sources/Subs-Admin.php

Parameters summary
`string`	`$file`	The filepath of the file where the data should be written.
`string`	`$data`	The data to be written to $file.
`string`	`$backup_file = null`	The filepath where the backup should be saved. Default null.
`integer`	`$mtime = null`	If modification time of $file is more recent than this Unix timestamp, the write operation will abort. Defaults to time that the script started execution.
`boolean`	`$append = false`	If true, the data will be appended instead of overwriting the existing content of the file. Default false.

Return value summary
`boolean`	Whether the write operation succeeded or not.

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Function safe_file_write