jQuery Post PHP总是发送成功响应

Question

I'm sending some data via Post to a php file, and I'm always retrieving a "success" in Jquery status even though the PHP is clearly sending back an error message.

What's the reason behind that?

$.post('post.php',
    {
    post1:somevariable1,
    post2:somevariable2,
    post3:somevariable3
    },
    function(response,status){
        if(status == "success") {
            //success message (I'm always getting this)
        }
        else {
            //error message
        }


    });

Post.php

if ($stmt === false) {
    echo "error!!";
    die(print_r(sqlsrv_errors(), true)); // This is what PHP is sending

} else {
    echo "Success!!"; 
    sqlsrv_free_stmt($stmt);  
}  

Thanks!

Answer 1

If you're sending the result of an operation as the return of a request, simply check the response in the success callback`

$.post('post.php',
    {
    post1:somevariable1,
    post2:somevariable2,
    post3:somevariable3
    },
    function(response,status){
        if(response.status == "success") { // Here I'm checking the `response` argument
            //success message (I'm always getting this)
        }
        else {
            //error message
        }
});

Where I've made the assumption that your response is being sent back from PHP as an object with the property status :

{
  status: "success"|"error"
}

Answer 2

As has been pointed out in the other answers, your PHP file is completing and then returning a success status and so you always see status=='success' . What you actually want to do is check the value in response . I would recommend doing something like:

if ($stmt === false) {
    echo json_encode(array('success' => false, 'reason' => sqlsrv_errors()));
    exit;  
} else {
    echo json_encode(array('success' => true));
    sqlsrv_free_stmt($stmt);  
}  

Then in your jquery do this:

$.post('post.php',
    {
    post1:somevariable1,
    post2:somevariable2,
    post3:somevariable3
    },
    function(response,status){
        let result = $.parseJSON(response);
        if (result.success) {
            echo "success!";
        }
        else {
            echo "error: " + result.reason;
        }
    });

Answer 3

I think the problem is that there is not a problem going on, the server is giving you a response of 200, because it did'nt find an error.

try using headers inside the condition where you want it to fail like

header("HTTP/1.1 500 Internal Server Error");
exit;
//or try return false;

Answer 4

The post.php is responding with status 200 with a response. The browser/js doesn't check what text you are sending in the response.

You can set the header to let the browser/just know about the error:

header("HTTP/1.1 500 Internal Server Error");