How to receive and use a json in ajax sended from php? [closed]

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I want to receive json from开发者_如何学运维 php to ajax and want to access the different field values in json.

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On the PHP side, use json_encode() to convert your data to JSON, and write it out, then exit. Best send a content type header first, to make sure the receiving end recognizes it as JSON:

<?php
$response_data = whatever_function();
$response = json_encode($response_data);
header("Content-type: text/json");
echo $response;
exit;

On the client, your best bet is to use an existing AJAX framework, such as the AJAX functionality built into jQuery. Suppose your script is at http://example.com/ajax.php, and the client page is at http://example.com/ajaxclient.html, a suitable piece of jQuery would go something like:

$.getJSON('ajax.php', { /* GET data goes here */ }, function(data) {
    /* data contains the values you sent in your PHP script */
});

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In jQuery it will be implementing something like this:

var user = {};

$.ajax({
  url: 'http://mysite.com/api/user.json',
  data: {'id': '42'},
  success: function(data){user = data;},
});

$('#name').val(user.name);
$('#email').val(user.email);