php里把二维数组弄成这种json数组

$arr = array("name"=>"网站",
             "num"=>3,
             "sites"=>array("Google", "Runoob", "Taobao")
);
    
myObj = {
    "name":"网站",
    "num":3,
    "sites":[ "Google", "Runoob", "Taobao" ]
}

json_encode就可以专为js需要的json格式，有帮助麻烦点个采纳【本回答右上角】，谢谢~~

<meta charset="utf-8">
<?php
 
$arr = array("name"=>"网站",
             "num"=>3,
             "sites"=>array("Google", "Runoob", "Taobao")
);
$myObj=json_encode($arr);
echo $myObj;
?>

使用json_encode转换即可。