var_dump ($row);

echo "hello";

echo "\n";

print_r ($arr);

php 数组 对象

$arr = json_decode($content,true);//将json字符串转化成php数组
print_r ($arr);

echo ( $arr['data'] );//数组

$obj = json_decode($content);//将json字符串转化成php对象
print_r ($obj);

echo ( $obj->data );//对象