/** * 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 */ public $errors = array(); /** * Stores the list of data for error codes. * * @since 2.1.0 * @var array */ public $error_data = array(); /** * Initialize the error. * * If `$code` is empty, the other parameters will be ignored. * When `$code` is not empty, `$message` will be used even if * it is empty. The `$data` parameter will be used only if it * is not empty. * * Though the class is constructed with a single error code and * message, multiple codes can be added using the `add()` method. * * @since 2.1.0 * * @param string|int $code Error code * @param string $message Error message * @param mixed $data Optional. Error data. */ public function __construct( $code = '', $message = '', $data = '' ) { if ( empty($code) ) return; $this->errors[$code][] = $message; if ( ! empty($data) ) $this->error_data[$code] = $data; } /** * Retrieve all error codes. * * @since 2.1.0 * @access public * * @return array List of error codes, if available. */ public function get_error_codes() { if ( empty($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. */ public 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 $code Optional. Retrieve messages matching code, if exists. * @return array Error strings on success, or empty array on failure (if using code parameter). */ public function get_error_messages($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 $code Optional. Error code to retrieve message. * @return string */ public function get_error_message($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 $code Optional. Error code. * @return mixed Error data, if it exists. */ public function get_error_data($code = '') { if ( empty($code) ) $code = $this->get_error_code(); if ( isset($this->error_data[$code]) ) return $this->error_data[$code]; } /** * Add an error or append additional message to an existing error. * * @since 2.1.0 * @access public * * @param string|int $code Error code. * @param string $message Error message. * @param mixed $data Optional. Error data. */ public function add($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 $code Error code. */ public function add_data($data, $code = '') { if ( empty($code) ) $code = $this->get_error_code(); $this->error_data[$code] = $data; } /** * Removes the specified error. * * This function removes all error messages associated with the specified * error code, along with any error data for that code. * * @since 4.1.0 * * @param string|int $code Error code. */ public function remove( $code ) { unset( $this->errors[ $code ] ); unset( $this->error_data[ $code ] ); } } /** * Check whether variable is a WordPress Error. * * Returns true if $thing is an object of the WP_Error class. * * @since 2.1.0 * * @param mixed $thing Check if unknown variable is a WP_Error object. * @return bool True, if WP_Error. False, if not WP_Error. */ function is_wp_error( $thing ) { return ( $thing instanceof WP_Error ); }
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