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<?php
function is_wp_error($thing) {
    if ( is_object($thing) && is_a($thing, 'WP_Error') )
        return true;
    return false;
}
?>

• Function Reference/is wp error « WordPress Codex
  Description. Check whether variable is a WordPress Error. Looks at the object and if a WP_Error class. Does not check to see if the parent is also WP_Error, ...
  codex.wordpress.org
• is_wp_error - WordPress.org
  Description | Classes | Functions. WordPress Error API. Contains the WP_Error class and the is_wp_error() function. Classes. Description | Classes | Functions ...
  phpdoc.wordpress.org
• wordpress: Fatal error: Call to undefined function is_wp_error() in
  I had my blog on live server it worked fine with my old site, I made ... It would be helpful to know the site address and the version of WP you're ...
  stackoverflow.com
• PHPXRef 0.7 : WordPress : Function Reference: is_wp_error()
  Function and Method Cross Reference. is_wp_error(). Defined at: /wp-includes/ class-wp-error.php -> line 194. Referenced 296 times: ...
  phpxref.ftwr.co.uk

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