php 输出 jsonp

<?php
header("content-type:text/html;charset=utf8");//加句这个在程序的最前面
error_reporting(E_ALL ^ E_NOTICE);


$servername = "localhost";
$username = "root";
$password = "root";

$dbname = "info";

$json=array(); 
$arr=array(); 

$diy_json='';
$diy_callback = 'checking_in_callback';
$diy_json = $diy_callback . '({';

// 建立链接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测链接
if ($conn->connect_error) {
    die("链接失败: " . $conn->connect_error);
}

//echo "<script>alert(".$department.");</script>";
$year = date('Y'); //获得年份
$month = date('m'); //获得月份
$day = date('d'); //日期



$sql = "SELECT DeptName AS `学院名称`,";
$sql = $sql."Status AS `状态`,";
$sql = $sql."count ";
$sql = $sql."FROM query_checking_in_info ";


$conn->query("set names utf8");  //提交前，加入。解决数据库中文乱码
$result = $conn->query($sql);

$department_arr = array();
if ($result ->num_rows > 0) {
	// 输出每行数据
	while($row = $result->fetch_assoc()) {
	    if(array_key_exists($row["学院名称"], $department_arr))
	    {
	        $department_arr[$row["学院名称"]] = $department_arr[$row["学院名称"]]. "\"". $row["状态"]. "\":". $row["count"]. ",";
	    }
	    else
	    {
	        $department_arr[$row["学院名称"]] = "";
	        $department_arr[$row["学院名称"]] = $department_arr[$row["学院名称"]]. "\"". $row["状态"]. "\":". $row["count"]. ",";
	    }
	}   // end while
	while(list($key, $val)= each($department_arr)) {
	    $diy_json = $diy_json. "\"". $key. "\":{". mb_substr($val, 0, mb_strlen($val,'UTF8') - 1, 'UTF8'). "},";
	}
	$diy_json = mb_substr($diy_json, 0, mb_strlen($diy_json,'UTF8') - 1, 'UTF8');
} else {
	echo "<br> 无数据 ";
}   // end if

$json[]=$arr;
$json = json_encode($json);
$callback = "checking_in_callback";


$diy_json = $diy_json.'})';
print $diy_json;

$conn->close();
?>