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Code Modernization: Deprecate dynamic properties in WP_List_Table magic methods. 

The unknown use of unknown dynamic property within the `WP_List_Table` property magic methods is now deprecated. A descriptive deprecation notice is provided to alert developers to declare the property on the child class extending `WP_List_Table`.

Changes in this commit:
* Adds a deprecation notice to the `__get()`, `__set()`, `__isset()`, `__unset()` magic methods, i.e. to alert and inform developers when attempting to get/set/isset/unset a dynamic property.
* Fixes `__get()` to explicitly returns `null` when attempting to get a dynamic property.
* Removes returning the value when setting a declared property, as (a) unnecessary and (b) `__set()` should return `void` [https://www.php.net/manual/en/language.oop5.overloading.php#object.set per the PHP handbook].
* Adds unit tests for happy and unhappy paths.

For backward compatibility, no changes are made to the internal declared properties listed in `$compat_fields` and accessed through the magic methods. 

For example:
A child class uses a property named `$data` that is not declared / defined as a property on the child class. When getting its value, e.g. `$list_table->data`, the `WP_List_Table::__get()` magic method is invoked, the following deprecation notice thrown, and `null` returned:

>The property `data` is not defined. Setting a dynamic (undefined) property is deprecated since version 6.4.0! Instead, define the property on the class.

=== Why not remove the magic methods, remove the `$compat_fields` property, and restore the properties `public`?

tl;dr Backward compatibility.

Several plugins, one of which has over 5M installs, add a property to the `$compat_fields` array. Removing the property would cause an `Undefined property` `Warning` (PHP 8) | `Notice` (PHP 7) to be thrown. Removing the associated code would change the functionality.

=== Why not limit the deprecation for PHP versions >= 8.2?

tl;dr original design intent and inform

The magic methods and `$compat_fields` property were added for one purpose: to continue providing external access to internal properties declared on `WP_List_Table`. They were not intended to be used for dynamic properties.

Deprecating that unintended usage both alerts developers a change is needed in their child class and informs them what to change.

References: 
* Dynamic (non-explicitly declared) properties are deprecated as of PHP 8.2 and are expected to become a fatal error in PHP 9.0.
* A [https://www.youtube.com/live/vDZWepDQQVE?feature=share&t=10097 live open public working session] where these changes were discussed and agreed to.
* [https://wiki.php.net/rfc/deprecate_dynamic_properties PHP RFC: Deprecate dynamic properties.]

Related to #14579, #22234, #30891.

Follow-up to [15491], [28493], [28521], [28524], [31146].

Props antonvlasenko, jrf, markjaquith, hellofromTonya, SergeyBiryukov, desrosj, peterwilsoncc, audrasjb, costdev, oglekler, jeffpaul.
Fixes #58896.
See #56034.
Built from https://develop.svn.wordpress.org/trunk@56349


git-svn-id: http://core.svn.wordpress.org/trunk@55861 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
hellofromTonya 2023-08-02 18:37:21 +00:00
parent d0e63ca7d2
commit 50274fbc2b
2 changed files with 32 additions and 3 deletions
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33
wp-admin/includes/class-wp-list-table.php
View File

@ -176,6 +176,7 @@ class WP_List_Table {
* Makes private properties readable for backward compatibility.
*
* @since 4.0.0
* @since 6.4.0 Getting a dynamic property is deprecated.
*
* @param string $name Property to get.
* @return mixed Property.
@ -184,27 +185,42 @@ class WP_List_Table {
if ( in_array( $name, $this->compat_fields, true ) ) {
return $this->$name;
}
trigger_error(
"The property `{$name}` is not defined. Getting a dynamic (undefined) property is " .
'deprecated since version 6.4.0! Instead, define the property on the class.',
E_USER_DEPRECATED
);
return null;
}
/**
* Makes private properties settable for backward compatibility.
*
* @since 4.0.0
* @since 6.4.0 Setting a dynamic property is deprecated.
*
* @param string $name Property to check if set.
* @param mixed $value Property value.
* @return mixed Newly-set property.
*/
public function __set( $name, $value ) {
if ( in_array( $name, $this->compat_fields, true ) ) {
return $this->$name = $value;
$this->$name = $value;
return;
}
trigger_error(
"The property `{$name}` is not defined. Setting a dynamic (undefined) property is " .
'deprecated since version 6.4.0! Instead, define the property on the class.',
E_USER_DEPRECATED
);
}
/**
* Makes private properties checkable for backward compatibility.
*
* @since 4.0.0
* @since 6.4.0 Checking a dynamic property is deprecated.
*
* @param string $name Property to check if set.
* @return bool Whether the property is a back-compat property and it is set.
@ -214,6 +230,11 @@ class WP_List_Table {
return isset( $this->$name );
}
trigger_error(
"The property `{$name}` is not defined. Checking `isset()` on a dynamic (undefined) property " .
'is deprecated since version 6.4.0! Instead, define the property on the class.',
E_USER_DEPRECATED
);
return false;
}
@ -221,13 +242,21 @@ class WP_List_Table {
* Makes private properties un-settable for backward compatibility.
*
* @since 4.0.0
* @since 6.4.0 Unsetting a dynamic property is deprecated.
*
* @param string $name Property to unset.
*/
public function __unset( $name ) {
if ( in_array( $name, $this->compat_fields, true ) ) {
unset( $this->$name );
return;
}
trigger_error(
"A property `{$name}` is not defined. Unsetting a dynamic (undefined) property is " .
'deprecated since version 6.4.0! Instead, define the property on the class.',
E_USER_DEPRECATED
);
}
/**

2
wp-includes/version.php
View File

@ -16,7 +16,7 @@
*
* @global string $wp_version
*/
$wp_version = '6.4-alpha-56348';
$wp_version = '6.4-alpha-56349';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.