PHP solves cross-domain issues

In the front-end, it always seems so disgusting when solving cross-domain problems. What about jsonp, ajax, CORS, etc. I always feel that I am taking advantage of loopholes to carry out cross-domain. In fact, in You only need to add a piece of code in the PHP file to cross-domain. You can write the front-end however you want. Post and get can be used casually.

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PHP solves cross-domain problems by adding them to the PHP file Three request headers are enough.

header("Access-Control-Allow-Origin:*"); // Specify to allow other domain names to access

header('Access -Control-Allow-Methods:POST'); // Response type

header('Access-Control-Allow-Headers:x-requested-with, content-type'); // Response Header settings

<?php
// 制定允许其他域名访问
header("Access-Control-Allow-Origin:*");
// 响应类型
header(&#39;Access-Control-Allow-Methods:POST&#39;);
// 响应头设置
header(&#39;Access-Control-Allow-Headers:x-requested-with, content-type&#39;);
 
//$callback = isset($_REQUEST[&#39;callback&#39;]) ? trim($_REQUEST[&#39;callback&#39;]) : &#39;&#39;; //jsonp回调参数，必需
function getKey($key,$default=""){
    return trim(isset($_REQUEST[$key])?$_REQUEST[$key]:$default);
}
$id = getKey("id");
$conn = mysqli_connect("localhost","root","","test") or die("连接失败");
$conn->query("set names utf8");
$sql = "select * from data where ".$id." is not null";
$result = $conn->query($sql);
$arr = [];
while($row=$result->fetch_assoc()){
    array_push($arr,json_encode($row));
}
$json = json_encode($arr);  //json 数据
print_r($json);

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