php - Jquery $.post return null value -


the following code working on localhost after hosting website. not returning accurate value. if use alert return default value on post code. value returned. instance:

$.post('sendingoffer.php',{id:id},function(data){     if(data=="true"){         currentbtn.html('<b>offer send</b>').css('background','#dce6f1');         currentbtn.html('<b>offer send</b>').css('outline','1px solid #dce6f1');         currentbtn.html('<b>offer send</b>').css('border','1px solid white');         currentbtn.html('<b>offer send</b>').css('mouse','cursor');         currentbtn.attr("disabled","disabled");         currentbtn.removeattr("href");      }else if(data=="false"){         alert('you have reached maximum number of 5 offers can send today');         }else if(data=="not null"){             alert("offer sent");         }else if(data=="assigned"){             alert('this job assigned person');         }else{       alert(data);// value returned }     }); 

this jquery code:

$('.buyerrequest').click(function(){      var currentbtn=$(this);     var id=$(this).attr('id').replace('id_','');   $.post('sendingoffer.php',{id:id},function(data){     if(data=="true"){         currentbtn.html('<b>offer send</b>').css('background','#dce6f1');         currentbtn.html('<b>offer send</b>').css('outline','1px solid #dce6f1');         currentbtn.html('<b>offer send</b>').css('border','1px solid white');         currentbtn.html('<b>offer send</b>').css('mouse','cursor');         currentbtn.attr("disabled","disabled");         currentbtn.removeattr("href");      }else if(data=="false"){         alert('you have reached maximum number of 5 offers can send today');         }else if(data=="not null"){             alert("offer sent");         }else if(data=="assigned"){             alert('this job assigned person');         }     });  }); 

this php code

<?php require'set_session.php';     require'../../../php/connection.php';     $buyer_id='';     $order_id='';     $buyer_name='';     $user_name=getuserfield('user_name');  if(isset($_post['id'])){      $order_id=$_post['id'];      $query="select `account_id` `place_order` `order_id`='$order_id'";     $query_run=mysql_query($query);      while($row=mysql_fetch_array($query_run)){          $buyer_id=$row['account_id'];         } }           $query="select `inbox_id` `inbox` `seller_name`='$user_name' , `date` ='".date("y-m-d")."'";         $query_run=mysql_query($query);         $query_num=mysql_num_rows($query_run);         $queryexst="select `inbox_id` `inbox` `seller_name`='$user_name' , `order_id`='$order_id'";         $query_rune=mysql_query($queryexst);         $query_nume=mysql_num_rows($query_rune);         $queryid="select `inbox_id` `inbox` `order_id`='$order_id' , `buyer_name` != ''";         $query_runid=mysql_query($queryid);         $query_numid=mysql_num_rows($query_runid);          if($query_num < 5){         if($query_nume==0){             if($query_numid == 0){             $query="insert `inbox` values('','$buyer_id','$order_id','".date("y-m-d")."','$user_name','','unread','unread','')";             $query_run=mysql_query($query);             echo'true';         }else{             echo'assigned';         }          }else{             echo'not null';         }         }else{             echo'false';         }  ?> 


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