![PHP 调试打印输出变量 PHP 调试打印输出变量](https://image.shishitao.com:8440/aHR0cHM6Ly9ia3FzaW1nLmlrYWZhbi5jb20vdXBsb2FkL2NoYXRncHQtcy5wbmc%2FIQ%3D%3D.png?!?w=700&webp=1)
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