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<?php $car = (object)[ 'general' => [ 'interior' => [ 'seats' => 'destroyed' ] ], 'other' => [ 'exterior' => [ 'hood' => 'dull' ] ] ]; $exteriorProperties = [ 'hood' => 'shiny', 'windows' => 'dirty' ]; var_export( json_decode( json_encode( array_replace_recursive( (array)$car, ['other' => ['exterior' => $exteriorProperties]] ) ) ) );
Output for git.master, git.master_jit, rfc.property-hooks
(object) array( 'general' => (object) array( 'interior' => (object) array( 'seats' => 'destroyed', ), ), 'other' => (object) array( 'exterior' => (object) array( 'hood' => 'shiny', 'windows' => 'dirty', ), ), )

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