Jquery POST with same request not work - php

Question

i have next problem
$("#btnsave").click(function () {
$.post('svld.php', {
'fnd': $('#fnd').attr("value")
}, function (data) {
alert(data);
}, 'json');
}
slvd.php
header('Content-type: application/json');
var_dump(json_encode($_POST));
in request i see next
fnd http://ya.ru
and have great response
string(24) "{"fnd":"http:\/\/ya.ru"}"
but alert(data) not runed
if i do same request on file parse.php in same folder
if($_POST['fnd']){
header('Content-type: application/json');
echo json_encode($cntTags->returnArrayTags());
}
all work perfect
Have idea what it can be ?
header list
Date Thu, 08 Jul 2010 12:16:02 GMT
Server Apache/2.2.14 (Win32) PHP/5.3.0
X-Powered-By PHP/5.3.0
Content-Length 38
Keep-Alive timeout=5, max=99
Connection Keep-Alive
Content-Type application/json
Host localhost
User-Agent Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
Accept application/json, text/javascript, */*
Accept-Language ru,en-us;q=0.7,en;q=0.3
Accept-Encoding gzip,deflate
Accept-Charset windows-1251,utf-8;q=0.7,*;q=0.7
Keep-Alive 115
Connection keep-alive
Content-Type application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With XMLHttpRequest
Referer http://localhost/tz/
Content-Length 22
Cookie spylog_test=1

Answer 1

The issue is that your HTTP request is returning this string:
string(24) "{"fnd":"http:\/\/ya.ru"}"
What happens is that jQuery is trying to parse that but it fails because it's not a valid JSON string.
Try using echo instead of var_dump:
echo json_encode($_POST);
var_dump() outputs other information that you don't need, and that will screw up jQuery's JSON parsing.

Answer 2

Content-Type application/json Заголовки запросапоказать исходный код
looks alien to me. Looks like a character-set failure.
try
header('Content-type: application/json; charset=UTF-8');