PHP无法获取AJAX JSON数据

Question

Trying to get json array from ajax, but when i'm trying to write it down in the text file, it shows nothing.

 var img = JSON.parse(localStorage.getItem("iPath"));
                var img = JSON.stringify(img);
                console.log(img);

                $.ajax({
                    url: './php/temporary.php?deletefile',
                    cache: false,
                    type: 'POST',
                    data: img,
                    success: function( respond, textStatus, jqXHR ){

                        if( typeof respond.error === 'undefined' ){
                            //window.location.assign("/buyplace.html");
                        }
                        else{
                            console.log('ОШИБКИ ОТВЕТА сервера: ' +  respond.error );
                        }
                    },
                    error: function( jqXHR, textStatus, errorThrown ){
                        console.log('ОШИБКИ AJAX запроса: ' + textStatus );
                    }
                });

 if( isset( $_GET['deletefile'] ) ){
        $params = json_decode( $_POST);
        $myfile = fopen("testfile.txt", "w");
        fwrite($myfile, $params);
        //$img = "uploads/" . $imgPath;
        //move_uploaded_file($imgPath, "./uploads/");
        //unlink('./uploads/' . $img);
    }
    ?>

How can i solve this problem?

Answer 1

$_POST will contain key-value pairs and what you are sending, is a string.

So you should either read the standard input, or you need to make sure that you are actually sending key-value pairs.

The first case is already posted as a comment by @Scuzzy.

For the latter, using the standard key-value pairs in $_POST :

 $.ajax({
      url: './php/temporary.php?deletefile',
      cache: false,
      type: 'POST',
      data: {json: img},
      // the rest of your js

And in php:

if( isset( $_GET['deletefile'] ) ){
    $params = json_decode($_POST['json']);
    // the rest of your php

Answer 2

There's no need to send the parameters as JSON. You can use an object as the data: option, and each property will be sent as the corresponding $_POST element.

var img = JSON.parse(localStorage.getItem("iPath"));
console.log(img);

$.ajax({
    url: './php/temporary.php?deletefile',
    cache: false,
    type: 'POST',
    data: img,
    success: function( respond, textStatus, jqXHR ){
        if( typeof respond.error === 'undefined' ){
            //window.location.assign("/buyplace.html");
        }
        else{
            console.log('ОШИБКИ ОТВЕТА сервера: ' +  respond.error );
        }
    },
    error: function( jqXHR, textStatus, errorThrown ){
        console.log('ОШИБКИ AJAX запроса: ' + textStatus );
    }
});

In PHP, you'll need to use json_encode() to convert the $_POST array to a string that can be written to a file.

if( isset( $_GET['deletefile'] ) ){
    $params = $_POST;
    $myfile = fopen("testfile.txt", "w");
    fwrite($myfile, json_encode($params));
}