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* adds a custom validation error message
* @param array $error_messages
* @return array
function xnau_add_url_validation_error_message( $error_messages )
// add our message with a placeholder for the field name
$error_messages['invalid url'] = 'You must provide a valid URL for the %s field.';
return $error_messages;
add_filter( 'pdb-validation_error_messages', 'xnau_add_url_validation_error_message' );
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