如何检查文件是否已上载 - How to check if a file was uploaded?

How to check if a file was uploaded?

我想检查用户是否使用表单上传了图像

我试过：

if (empty($_FILES['txtImage'])) {
    $msg = 'Opss, you forgot the image.';
}

由于PHP 4.2.0，PHP将返回一个适当的错误代码和文件数组。

所以，

<?php
if ($_FILES['txtImage']['error'] === UPLOAD_ERR_NO_FILE) {
    $msg .= "Opss, you forgot the image.<br>";
}
?>

http://php.net/manual/en/features.file-upload.errors.php

http://www.php.net/is_uploaded_file

if(!file_exists($_FILES['myfile']['tmp_name']) || !is_uploaded_file($_FILES['myfile']['tmp_name'])) {
    echo 'No upload';
}

此外，您可以使用getimagesize（）进行检查，如果它返回FALSE，则它不是图像

https://stackoverflow.com/a/946432/1172872