What is the point of this constant in Kohana?

In Kohana's core class, there is a constant FILE_SECURITY.

string(60) "<?php defined('SYSPATH') or die('No direct script access.');"

Now obviously if you place this at the start of your f开发者_开发问答iles, and if it is accessed outside of the Kohana environment, it will die().

But what is the purpose of this constant? We can't eval() it because it has a leading <?php.

Does Kohana create PHP files somewhere and uses it to prepend it to the start of the file?

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The Kohana_Log_File::write function uses the constant:

// Set the name of the log file
$filename = $directory.date('d').EXT;

if ( ! file_exists($filename))
{
    // Create the log file
    file_put_contents($filename, Kohana::FILE_SECURITY.' ?>'.PHP_EOL);

    // Allow anyone to write to log files
    chmod($filename, 0666);
}

Looks like it's inserted into a log to stop it from being read from a public URL.

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Also you can use this constant while autogenerating your custom files, like configs (possible in installation apps?).