使用本地AJAX请求解析JSON数据

Question

I've got a php file on a webserver that executes queries to a MySQL database.

I'm testing a site on my pc (locally) that uses a js file with an AJAX request to get JSON data from that php file.

Is it possible to do it like this, or the js file must be put on the same domain server of the php file?

Because the console.log of the parsed data gives me this error:

Uncaught SyntaxError: Unexpected token I

This is the ajax call

$.ajax({
    method:"POST", 
    crossDomain:true, 
    url:"url for the php file",
    data:{
        query: "SELECT * FROM course_categories;"
    },

    success: function(response){

        var course_categories=JSON.parse(response); 
        console.log(course_categories);
        var el="";
        console.log(course_categories.length);
        for(var i=0;i<(course_categories.length);i++)
        {

        }

    },

    error: function(request,error){
        console.log("ERROR: Request " + request + "
Specific Error: " + error);
    }

While this is the PHP call

<?php

//get all the courses from the database and reply using the JSON structure

//$mysqli=new msqli("localhost","username","password","dbname");

 $mysqli=new mysqli("localhost","hey","","db_name");


if(mysqli_connect_errno()) //returns a number of the error if there is any,              if not
{
echo json_encode("Error to connect to DBMS".mysqli_connect_error());

exit(); //closes the connection
}
else
{


$query=$_POST["query"];
    //$query="SELECT * FROM course_categories";
       $result=$mysqli->query($query); //do a query (->query) setted by $query, using the $mysqli variable, and store the data in $result 

if($result->num_rows >0) //if there is at least one row...
{
    $myArray= array(); //...create an array...
    while($row = $result->fetch_array(MYSQL_ASSOC))
    { 
        //...and fetch it. Everytime this operation returns a row,
        $myArray[]=$row; //...and added to myArray ([] means autoincrement).
    }

}

echo json_encode(utf8ize($myArray));

 //free result
$result->close();

//close connection
$mysqli->close(); 

}