php - 验证上传的文件类型

Question

为什么下面无法识别正在上传的图像(.jpg)？

我收到上传的文件不是图像!!!

$finfo = finfo_open(FILEINFO_MIME_TYPE, 'C:\xampp\php\extras\magic\magic.mime');
if(strpos(finfo_file($finfo, $_FILES['userfile']['tmp_name']),"image")===0) {    

  // prepare the image for insertion
  $imgData =addslashes (file_get_contents($_FILES['userfile']['tmp_name']));

  // put the image in the db...
  // database connection
  mysql_connect($host, $user, $pass) OR DIE (mysql_error());

  // select the db
  mysql_select_db ($db) OR DIE ("Unable to select db".mysql_error());

  // our sql query
  $sql = "INSERT INTO uploaded_images
  (image, name)
  VALUES
  ('{$imgData}', '{$_FILES['userfile']['name']}');";

  // insert the image
  mysql_query($sql) or die("Error in Query: " . mysql_error());
  $msg='<p>Image successfully saved in database with id ='. mysql_insert_id().' </p>';
}
else
  $msg="<p>Uploaded file is not an image.</p>";

Answer 1

如果您无权访问 GD 库，您可以简单地使用 getimagesize()，如果它不是图像，它将返回 false。 http://php.net/manual/en/function.getimagesize.php