nocache_headers()

Sets the HTTP headers to prevent caching for the different browsers.

Description

Different browsers support different nocache headers, so several headers must be sent so that all of them get the point that no caching should occur.

See also

More Information

Usage:
nocache_headers();

Source

function nocache_headers() {
	if ( headers_sent() ) {
		return;
	}

	$headers = wp_get_nocache_headers();

	unset( $headers['Last-Modified'] );

	header_remove( 'Last-Modified' );

	foreach ( $headers as $name => $field_value ) {
		header( "{$name}: {$field_value}" );
	}
}

Changelog

VersionDescription
2.0.0Introduced.

User Contributed Notes

  1. Skip to note 2 content

    Use nocache_headers to add custom headers to wp-admin pages. Example code:

    add_filter( 'nocache_headers', function() {
        return array(
            'Cache-Control' => 'no-store, no-cache, must-revalidate, max-age=0, some-custom-thing',
            'Pragma'        => 'no-cache',
            'Expires'       => gmdate( 'D, d M Y H:i:s \G\M\T', time() )
        );
    } );

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