GhostFieldAccessTrait.php

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<?php
namespace Wikimedia\Reflection;
 
trait GhostFieldAccessTrait {
 
    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;
    }
 
    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;
            }
        }
    }
}