Atomically appending a line to a file and creating it if it doesn't exist

Question

I\'m trying to create a function (for purposes of logging)

append($path, $data)

that

1. creates $file if it doesn\'t exist and

Answer 1

PHP already has a built-in function to do this, file_put_contents(). The syntax is:

file_put_contents($filename, $data, FILE_APPEND);

Note that file_put_contents() will create the file if it does not already exist (as long as you have file system permissions to do so).