February 24, 2011 
Definition:
function is_wp_error($thing) {}
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, so can’t inherit WP_Error and still use this function.
Parameters
- mixed $thing: Check if unknown variable is WordPress Error object.
Return values
returns:True, if WP_Error. False, if not WP_Error.
Source code
function is_wp_error($thing) {
if ( is_object($thing) && is_a($thing, 'WP_Error') )
return true;
return false;
}
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A HitchHackers guide through WordPress 
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