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$arrayobj = new ArrayObject();

foreach ($data as $value) {

	$key = $value['key'];

	<!--$obj = (object) array(-->
	<!--	$key => (object) array(-->
	<!--		'address' => 'xxx'-->
	<!--	)-->
	<!--);-->

	<!--$arrayobj->append($obj);-->
	
	$arrayobj[$key] = (object) array(
					'address' => 'xxx'
				);


}
		
		//-> {"key": {"address": "xxx"}}