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I maintain a bunch of different WordPress sites, and I have noticed a wide variety of default filenames for the XML content export file (Tools-Export-all content). Some of them even use a PHP extension for the downloaded XML file.

How can I set or define the name of the export.xml file? Thanks!

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By default, the filename is defined in /wp-admin/includes/export.php:

$sitename = sanitize_key( get_bloginfo( 'name' ) );
if ( ! empty( $sitename ) ) {
    $sitename .= '.';
}
$date        = gmdate( 'Y-m-d' );
$wp_filename = $sitename . 'WordPress.' . $date . '.xml';

And you can filter it:

$filename = apply_filters( 'export_wp_filename', $wp_filename, $sitename, $date );

So you could make a plugin and add a filter there:

add_filter(
    'export_wp_filename',
    function( $wp_filename, $sitename, $date )
    {
        // do something here, and then return a string
    }, 10, 3
);

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