WP_Error()

WordPress Error class.


Description Description

Container for checking for WordPress errors and error messages. Return WP_Error and use 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.


Source Source

File: wp-includes/class-wp-error.php

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 ] );
	}
}

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Changelog Changelog

Changelog
Version Description
2.1.0 Introduced.

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Methods Methods

  • __construct — Initialize the error.
  • __get — Make private properties readable for backwards compatibility.
  • __isset — Make private properties checkable for backwards compatibility.
  • __set — Make private properties settable for backwards compatibility.
  • __unset — Make private properties un-settable for backwards compatibility.
  • add — Add an error or append additional message to an existing error.
  • add_data — Add data for error code.
  • get_error_code — Retrieve first error code available.
  • get_error_codes — Retrieve all error codes.
  • get_error_data — Retrieve error data for error code.
  • get_error_message — Get single error message.
  • get_error_messages — Retrieve all error messages or error messages matching code.
  • remove — Removes the specified error.

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