PHP中数组转JSon和JSon转数组的实现

$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);

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