file_get_contents（）：文件名不能为空

Question

<?php
include '../database/db.php';
if(isset($_POST['email1'])){
$email=$_POST['email1'];
$caption= $_POST['caption'];
 //upload image
 $file=$_FILES['image']['tmp_name'];
  if (!isset($file)) {
  }else{
  $image= addslashes(file_get_contents($file));
  $image_name= addslashes($file);
  $image_size= getimagesize($file);}
    if ($image_size=="") {
      die(mysql_error());}
    else{
     move_uploaded_file($_FILES["image"]["tmp_name"],"../pics/" . $_FILES["image"]["name"]);
      $images="../pics/" . $_FILES["image"]["name"];
  //Create query
  $sql="INSERT INTO pic (filename,email,caption) VALUES '`$images`'``,'$email',``'`$caption`')`"`;
if (!mysql_query($sql))
  {
  echo '<script>alert("Please rename your picture only letters or numbers are valid");</script>';
  }
echo '<iis_get_script_map(server_instance, virtual_path, script_extension)>alert("Successfully Uploaded!"); window.location="home.php";</script>';
}
}
else{
    die(mysql_error());
}
 ?>

  

警告：file_get_contents（）：第15行的文件名不能为空

     

警告：getimagesize（）：第17行的文件名不能为空