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<?php
/**
* WordPress Error API.
*
* Contains the WP_Error class and the is_wp_error() function.
*
* @package WordPress
*/
/**
* WordPress Error class.
*
* Container for checking for WordPress errors and error messages. Return
* WP_Error and use {@link is_wp_error()} to check if this class is returned.
* Many core WordPress functions pass this class in the event of an error and
* if not handled properly will result in code errors.
*
* @package WordPress
* @since 2.1.0
*/
class WP_Error {
/**
* Stores the list of errors.
*
* @since 2.1.0
* @var array
* @access private
*/
var $errors = array();
/**
* Stores the list of data for error codes.
*
* @since 2.1.0
* @var array
* @access private
*/
var $error_data = array();
/**
* Constructor - Sets up error message.
*
* If code parameter is empty then nothing will be done. It is possible to
* add multiple messages to the same code, but with other methods in the
* class.
*
* All parameters are optional, but if the code parameter is set, then the
* data parameter is optional.
*
* @since 2.1.0
*
* @param string|int $code Error code
* @param string $message Error message
* @param mixed $data Optional. Error data.
* @return WP_Error
*/
function __construct($code = '', $message = '', $data = '') {
if ( empty($code) )
return;
$this->errors[$code][] = $message;
if ( ! empty($data) )
$this->error_data[$code] = $data;
}
/**
* Retrieve all error codes.
*
* @since 2.1.0
* @access public
*
* @return array List of error codes, if available.
*/
function get_error_codes() {
if ( empty($this->errors) )
return array();
return array_keys($this->errors);
}
/**
* Retrieve first error code available.
*
* @since 2.1.0
* @access public
*
* @return string|int Empty string, if no error codes.
*/
function get_error_code() {
$codes = $this->get_error_codes();
if ( empty($codes) )
return '';
return $codes[0];
}
/**
* Retrieve all error messages or error messages matching code.
*
* @since 2.1.0
*
* @param string|int $code Optional. Retrieve messages matching code, if exists.
* @return array Error strings on success, or empty array on failure (if using code parameter).
*/
function get_error_messages($code = '') {
// Return all messages if no code specified.
if ( empty($code) ) {
$all_messages = array();
foreach ( (array) $this->errors as $code => $messages )
$all_messages = array_merge($all_messages, $messages);
return $all_messages;
}
if ( isset($this->errors[$code]) )
return $this->errors[$code];
else
return array();
}
/**
* Get single error message.
*
* This will get the first message available for the code. If no code is
* given then the first code available will be used.
*
* @since 2.1.0
*
* @param string|int $code Optional. Error code to retrieve message.
* @return string
*/
function get_error_message($code = '') {
if ( empty($code) )
$code = $this->get_error_code();
$messages = $this->get_error_messages($code);
if ( empty($messages) )
return '';
return $messages[0];
}
/**
* Retrieve error data for error code.
*
* @since 2.1.0
*
* @param string|int $code Optional. Error code.
* @return mixed Null, if no errors.
*/
function get_error_data($code = '') {
if ( empty($code) )
$code = $this->get_error_code();
if ( isset($this->error_data[$code]) )
return $this->error_data[$code];
return null;
}
/**
* Append more error messages to list of error messages.
*
* @since 2.1.0
* @access public
*
* @param string|int $code Error code.
* @param string $message Error message.
* @param mixed $data Optional. Error data.
*/
function add($code, $message, $data = '') {
$this->errors[$code][] = $message;
if ( ! empty($data) )
$this->error_data[$code] = $data;
}
/**
* Add data for error code.
*
* The error code can only contain one error data.
*
* @since 2.1.0
*
* @param mixed $data Error data.
* @param string|int $code Error code.
*/
function add_data($data, $code = '') {
if ( empty($code) )
$code = $this->get_error_code();
$this->error_data[$code] = $data;
}
}
/**
* 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.
*
* @since 2.1.0
*
* @param mixed $thing Check if unknown variable is WordPress Error object.
* @return bool True, if WP_Error. False, if not WP_Error.
*/
function is_wp_error($thing) {
if ( is_object($thing) && is_a($thing, 'WP_Error') )
return true;
return false;
}
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