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<?php class A { public $x; public function __construct() { $this->x = 1; } public function __sleep() { return [ 'x', '' ]; } } $a = new A; var_dump( unserialize( serialize( $a ) ) );
Output for git.master, git.master_jit, rfc.property-hooks
Warning: serialize(): "" returned as member variable from __sleep() but does not exist in /in/9KgXc on line 17 object(A)#2 (1) { ["x"]=> int(1) }

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