PHP json_encode

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<?php$demo1 = array('result' =>true );
echo json_encode($demo1);//{"result":true}$picsList=array("countTotal"=>2,"list"=> array(array('name' =>'orabge.jpg','size'=>1233123),array('name' =>'apple.jpg' ,'size'=>73878 ))
);print_r($picsList);//print_r()是专门用来输出数组的函数
echo json_encode($picsList);
//上面输出的结果是{"countTotal":2,"list":[{"name":"orabge.jpg","size":1233123},{"name":"apple.jpg","size":73878}]}?>