如何只允许某些文件类型在php中上传？

将允许的类型放入数组并使用

in_array()

$file_type = $_FILES['foreign_character_upload']['type']; //returns the mimetype$allowed = array("image/jpeg", "image/gif", "application/pdf");if(!in_array($file_type, $allowed)) {  $error_message = 'only jpg, gif, and pdf files are allowed.';  $error = 'yes';}