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<?php
function is_404() {
    global $wp_query;

    if ( ! isset( $wp_query ) ) {
        _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1' );
        return false;
    }

    return $wp_query->is_404();
}
?>

• is_404() - WordPress Codex
  Description. This Conditional Tag checks if 404 error is being displayed (after an "HTTP 404: Not Found" error occurs). This is a boolean function, meaning it ...
  codex.wordpress.org
• Conditional Tags « WordPress Codex
  A 404 Not Found Page. is_404(): When a page displays after an "HTTP 404: Not Found" error occurs. A Paged Page. is_paged(): When the page being ...
  codex.wordpress.org
• is_404 Errors On Plugin Activation | Support Forum | Agapetry
  Notice: is_404 was called incorrectly. Conditional query tags do not work before the query is run. Before then, they always return false. Please ...
  agapetry.net
• <?php if (is_home()) { Anne Ristorcelli; } elseif (is_404()) { ?> 404 Not
  Violist Anne Ristorcelli, a native Nevadan, began her musical studies at the age of eight. She started with violin lessons and switched to the viola a few years ...
  anneristorcelli.com

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