Prevent php scripts used in WP being run outside WP

  • I have a custom page template which reveals php files for someone studying the page source. What code can I put at the start of this file to prevent someone trying to run the script outside WordPress ?

    For example in an Ajax script I have the line

    if ( empty( $_REQUEST['action'] ) )
	die( '0' );

    Someone trying to run this code directly just see a 0.

    Thanks.

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