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);
var_dump($jsonObj_1);
$jsonObj_1 = json_encode($array_2);
var_dump($jsonObj_1);
运行结果：
Array
(
[menber] => Array
(
[aa] => Array
(
[username] => ericwolf
[age] => 25
)
[bb] => Array
(
[username] => eeee
[age] => 22
)
)
)
string(32) "{"username":"ericwolf","age":25}"
string(84) "{"menber":{"aa":{"username":"ericwolf","age":25},"bb":{"username":"eeee","age":22}}}"