PHP file is not uploading -

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i have form in can upload image. reason not able upload image. have updated file permissions (777 permissions) , still file not upload. form seems working because text (not included in form updating)

<form action="manage_content.php?project=5" method="post" enctype="multipart/form-data">     <div class="width">         <p>project image: <br>         <input type="file" name="image_file" id="file" class="inputfile" />         <label for="file">choose file</label>         </p>     </div>     <input type="submit" name="update_project" value="update current project">     </form>

the php form processing. 

if (isset($_post['update_project'])) {     $required_fields = array("project_name", "date", "content");         validate_presences($required_fields);          $fields_with_max_length = array("project_name" => 30);         validate_max_length($fields_with_max_length);      $id = $current_project["id"];     $project_name = mysql_prep($_post["project_name"]);     $date = mysql_prep($_post["date"]);     $content = mysql_prep($_post["content"]);      $target_dir = "images/"; $target_file = $target_dir . basename($_files["image_file"]["name"]); $uploadok = 1; $imagefiletype = pathinfo($target_file,pathinfo_extension);      print_r($_files);     echo "<br>" . $target_file;      if (empty($errors)) {             if($_files["image_file"]["error"] == 4) {             //means there no file uploaded             $query = "";             $result = mysqli_query($connection, $query);              if ($result && mysqli_affected_rows($connection) >= 0) {                 $_session["message"] = "subject updated";             //  redirect_to("manage_content.php?subject=$current_subject[id]");             }          } else {             $query = "";             $result = mysqli_query($connection, $query);              if ($result && mysqli_affected_rows($connection) >= 0) {                 $_session["message"] = "subject updated";             //  redirect_to("manage_content.php?subject=$current_subject[id]");              }          }      } else {             $message = "subject creation failed.";             }       } else {         // request         // end of post submit     }  ?>

print_r($_files) gives me: 

array ( [image_file] => array (    [name] => 1.jpg    [type] => image/jpeg    [tmp_name] => c:\xampp\tmp\phpf5aa.tmp    [error] => 0    [size] => 24397 )  )  , echo $target_file gives: images/1.jpg

be sure directory uploading has same permissions , ownership program uploading file. should have write permissions user. same go file if exists, must have write permissions in order replace file.





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