javascript - How to fetch data from database with json_encode of ajax -

i use ajax fetch data db. , chose alert(valdata) in success function test data, unlucky nothing return ajax. tested

select contact idc id='5'; 

it works fine in mysql cmd line.

here js code:

var stnum = 5; $.ajax({         datatype:'json',         type:"post",         url:"get_ajax_csc.php",         data:{stnum:stnum},         success:function(data)          {          var valdata = data;          alert(valdata);          $('#stcontact').val(data.stcnt);          $('#stphone').val(data.stpho);         }       }); 

here html code:

<div class="divfir">     <label>contact:</label><input type="text" id="stcontact" ><br />     <label>phone:</label><input type="text" id="stphone" ><br /> </div> 

here get_ajax_csc.php code:

<?php if(isset($_post['stnum'])) {     include("db.php");   $q=$_post["stnum"];  $sql="select contact,phone idc id='".$q."';";  $sel = $conn->query($sql);    $arr = $sel->fetch(pdo::fetch_assoc);  $tmparr = array(     'stcnt'=>$arr['contace'],     'stpho'=>$arr['phone']     );  echo json_encode($tmparr);  }   if(isset($_post['htmlcnt'])) {    include("db.php"); $htcnt=stripslashes(".$_post['htmlcnt']."); ........ }  ?> 

here db.php code:

<?php session_start(); $pwd=$_session['password']; $user=$_session['user'];  try  {   $conn = new pdo('mysql:host=x.x.x.x;port=3306;dbname=hpc',$user,$pwd); } catch (pdoexception $e) {   echo "account or pwd wrong <meta http-equiv='refresh' content='1;url=index.html'>";     exit; }   $conn->setattribute(pdo::attr_oracle_nulls, true); ?> 

it seems nothing wrong in code, cann't fetch data database

i have found stripslashes() made ajax return nothing. when shielded method (//stripslashes()), worked fine. why stripslashes can influence ajax return data?

i found that:

$htcnt=stripslashes(".$_post['htmlcnt']."); 

change to:

$htcnt=stripslashes($_post['htmlcnt']);