PHP中数组转JSon和JSon转数组的实现

数组转JSon数据：

$array_1 = array(); //一维数组
 $array_2 = array(); //多维数组
 $array_1['username']='ericwolf';
 $array_1['age']=25;

 $array_2['menber']['aa']['username']='ericwolf';
 $array_2['menber']['aa']['age']=25;
 $array_2['menber']['bb']['username']='eeee';
 $array_2['menber']['bb']['age']=22;

 print_r($array_2);
 $jsonObj_1 = json_encode($array_1);
 $jsonObj_1 = json_encode($array_2);

JSon转数组，并打印：

$jsonStr = '{"key":"value","key1":"value1"}';
 $json2Array = json_decode($jsonStr,true);
 foreach($json2Array as $key=>$val) {
  echo $key."=".$val."<br/>";
 }