如何在PHP中限制文件上传类型的文件大小？

您的代码未解决的问题是显示多个错误。如上所述，用户可能会上传错误类型> 2MB的文件，但是您的代码只能报告其中一个问题。尝试类似的方法：

if(isset($_FILES['uploaded_file'])) {    $errors     = array();    $maxsize    = 2097152;    $acceptable = array(        'application/pdf',        'image/jpeg',        'image/jpg',        'image/gif',        'image/png'    );    if(($_FILES['uploaded_file']['size'] >= $maxsize) || ($_FILES["uploaded_file"]["size"] == 0)) {        $errors[] = 'File too large. File must be less than 2 megabytes.';    }    if((!in_array($_FILES['uploaded_file']['type'], $acceptable)) && (!empty($_FILES["uploaded_file"]["type"]))) {        $errors[] = 'Invalid file type. only PDF, JPG, GIF and PNG types are accepted.';    }    if(count($errors) === 0) {        move_uploaded_file($_FILES['uploaded_file']['tmpname'], '/store/to/location.file');    } else {        foreach($errors as $error) { echo '<script>alert("'.$error.'");</script>';        }        die(); //Ensure no more processing is done    }}

move_uploaded_file()