WordPress/wp-includes/class-wp-error.php

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<?php
/**
* WordPress Error API.
*
* @package WordPress
*/
/**
* WordPress Error class.
*
* 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.
*
* @since 2.1.0
*/
Code Modernization: Add `AllowDynamicProperties` attribute to all (parent) classes. Dynamic (non-explicitly declared) properties are deprecated as of PHP 8.2 and are expected to become a fatal error in PHP 9.0. There are a number of ways to mitigate this: * If it is an accidental typo for a declared property: fix the typo. * For known properties: declare them on the class. * For unknown properties: add the magic `__get()`, `__set()`, et al. methods to the class or let the class extend `stdClass` which has highly optimized versions of these magic methods built in. * For unknown ''use'' of dynamic properties, the `#[AllowDynamicProperties]` attribute can be added to the class. The attribute will automatically be inherited by child classes. Trac ticket #56034 is open to investigate and handle the third and fourth type of situations, however it has become clear this will need more time and will not be ready in time for WP 6.1. To reduce “noise” in the meantime, both in the error logs of WP users moving onto PHP 8.2, in the test run logs of WP itself, in test runs of plugins and themes, as well as to prevent duplicate tickets from being opened for the same issue, this commit adds the `#[AllowDynamicProperties]` attribute to all “parent” classes in WP. The logic used for this commit is as follows: * If a class already has the attribute: no action needed. * If a class does not `extend`: add the attribute. * If a class does `extend`: - If it extends `stdClass`: no action needed (as `stdClass` supports dynamic properties). - If it extends a PHP native class: add the attribute. - If it extends a class from one of WP's external dependencies: add the attribute. * In all other cases: no action — the attribute should not be needed as child classes inherit from the parent. Whether or not a class contains magic methods has not been taken into account, as a review of the currently existing magic methods has shown that those are generally not sturdy enough and often even set dynamic properties (which they should not). See the [https://www.youtube.com/watch?v=vDZWepDQQVE live stream from August 16, 2022] for more details. This commit only affects classes in the `src` directory of WordPress core. * Tests should not get this attribute, but should be fixed to not use dynamic properties instead. Patches for this are already being committed under ticket #56033. * While a number bundled themes (2014, 2019, 2020, 2021) contain classes, they are not a part of this commit and may be updated separately. Reference: [https://wiki.php.net/rfc/deprecate_dynamic_properties PHP RFC: Deprecate dynamic properties]. Follow-up to [53922]. Props jrf, hellofromTonya, markjaquith, peterwilsoncc, costdev, knutsp, aristath. See #56513, #56034. Built from https://develop.svn.wordpress.org/trunk@54133 git-svn-id: http://core.svn.wordpress.org/trunk@53692 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2022-09-12 11:47:14 -04:00
#[AllowDynamicProperties]
class WP_Error {
/**
* Stores the list of errors.
*
* @since 2.1.0
* @var array
*/
public $errors = array();
/**
* Stores the most recently added data for each error code.
*
* @since 2.1.0
* @var array
*/
public $error_data = array();
/**
* Stores previously added data added for error codes, oldest-to-newest by code.
*
* @since 5.6.0
* @var array[]
*/
protected $additional_data = array();
/**
* Initializes the error.
*
* If `$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. Default empty string.
*/
public function __construct( $code = '', $message = '', $data = '' ) {
if ( empty( $code ) ) {
return;
}
$this->add( $code, $message, $data );
}
/**
* Retrieves all error codes.
*
* @since 2.1.0
*
* @return array List of error codes, if available.
*/
public function get_error_codes() {
if ( ! $this->has_errors() ) {
return array();
}
return array_keys( $this->errors );
}
/**
* Retrieves the first error code available.
*
* @since 2.1.0
*
* @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];
}
/**
* Retrieves all error messages, or the error messages for the given error code.
*
* @since 2.1.0
*
* @param string|int $code Optional. Error code to retrieve the messages for.
* Default empty string.
* @return string[] Error strings on success, or empty array if there are none.
*/
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();
}
}
/**
* Gets a 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 the message for.
* Default empty string.
* @return string The error message.
*/
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];
}
/**
* Retrieves the most recently added error data for an error code.
*
* @since 2.1.0
*
* @param string|int $code Optional. Error code. Default empty string.
* @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 ];
}
}
/**
* Verifies if the instance contains errors.
*
* @since 5.1.0
*
* @return bool If the instance contains errors.
*/
public function has_errors() {
if ( ! empty( $this->errors ) ) {
return true;
}
return false;
}
/**
* Adds an error or appends an additional message to an existing error.
*
* @since 2.1.0
*
* @param string|int $code Error code.
* @param string $message Error message.
* @param mixed $data Optional. Error data. Default empty string.
*/
public function add( $code, $message, $data = '' ) {
$this->errors[ $code ][] = $message;
if ( ! empty( $data ) ) {
$this->add_data( $data, $code );
}
/**
* Fires when an error is added to a WP_Error object.
*
* @since 5.6.0
*
* @param string|int $code Error code.
* @param string $message Error message.
* @param mixed $data Error data. Might be empty.
* @param WP_Error $wp_error The WP_Error object.
*/
do_action( 'wp_error_added', $code, $message, $data, $this );
}
/**
* Adds data to an error with the given code.
*
* @since 2.1.0
* @since 5.6.0 Errors can now contain more than one item of error data. {@see WP_Error::$additional_data}.
*
* @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();
}
if ( isset( $this->error_data[ $code ] ) ) {
$this->additional_data[ $code ][] = $this->error_data[ $code ];
}
$this->error_data[ $code ] = $data;
}
/**
* Retrieves all error data for an error code in the order in which the data was added.
*
* @since 5.6.0
*
* @param string|int $code Error code.
* @return mixed[] Array of error data, if it exists.
*/
public function get_all_error_data( $code = '' ) {
if ( empty( $code ) ) {
$code = $this->get_error_code();
}
$data = array();
if ( isset( $this->additional_data[ $code ] ) ) {
$data = $this->additional_data[ $code ];
}
if ( isset( $this->error_data[ $code ] ) ) {
$data[] = $this->error_data[ $code ];
}
return $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 ] );
unset( $this->additional_data[ $code ] );
}
/**
* Merges the errors in the given error object into this one.
*
* @since 5.6.0
*
* @param WP_Error $error Error object to merge.
*/
public function merge_from( WP_Error $error ) {
static::copy_errors( $error, $this );
}
/**
* Exports the errors in this object into the given one.
*
* @since 5.6.0
*
* @param WP_Error $error Error object to export into.
*/
public function export_to( WP_Error $error ) {
static::copy_errors( $this, $error );
}
/**
* Copies errors from one WP_Error instance to another.
*
* @since 5.6.0
*
* @param WP_Error $from The WP_Error to copy from.
* @param WP_Error $to The WP_Error to copy to.
*/
protected static function copy_errors( WP_Error $from, WP_Error $to ) {
foreach ( $from->get_error_codes() as $code ) {
foreach ( $from->get_error_messages( $code ) as $error_message ) {
$to->add( $code, $error_message );
}
foreach ( $from->get_all_error_data( $code ) as $data ) {
$to->add_data( $data, $code );
}
}
}
}