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<?php /** * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ namespace Wikimedia\Reflection; /** * Trait for accessing "ghost fields". * * Ghost fields are fields that have been created in an object instance * by PHP's unserialize() mechanism, though they no longer exist * in the current version of the corresponding class. * * Accessing non-public ghost fields offers some challenges due to * how they are handled by PHP internally. * * @see https://www.php.net/manual/en/language.types.array.php#language.types.array.casting * @since 1.36 */ trait GhostFieldAccessTrait { /** * Get the value of the ghost field named $name, * or null if the field does not exist. * * @param string $name * @param class-string ...$aliases * @return mixed|null */ private function getGhostFieldValue( string $name, string ...$aliases ) { if ( isset( $this->$name ) ) { return $this->$name; } $data = (array)$this; // Protected variables have a '*' prepended to the variable name. // These prepended values have null bytes on either side. $protectedName = "\x00*\x00{$name}"; if ( isset( $data[$protectedName] ) ) { return $data[$protectedName]; } // Private variables have the class name prepended to the variable name. // These prepended values have null bytes on either side. $thisClass = get_class( $this ); $privateName = "\x00{$thisClass}\x00{$name}"; if ( isset( $data[$privateName] ) ) { return $data[$privateName]; } // Check old aliased class names as well. foreach ( $aliases as $thisClass ) { $privateName = "\x00{$thisClass}\x00{$name}"; if ( isset( $data[$privateName] ) ) { return $data[$privateName]; } } return null; } /** * In PHP <= 8.1, private fields of a class are not properly restored * when the class is aliased to a new name, since the private fields are * prefixed with the *old* name of the class. This method can be used * to restore them if present after deserialization. * * @param string $name * @param class-string ...$aliases */ private function restoreAliasedGhostField( string $name, string ...$aliases ): void { $data = (array)$this; foreach ( $aliases as $thisClass ) { $privateName = "\x00{$thisClass}\x00{$name}"; if ( isset( $data[$privateName] ) ) { $this->$name = $data[$privateName]; unset( $data[$privateName] ); return; } } } }
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