使用$_FILES[‘file’][‘error’]系统变量获取的是文件上传控件当前的错误代码(int型)，无法向用户提供更确定的错误信息，以帮助用户了解是什么原因导致的文件上传错误。
在php手册(php.net)上，对文件上传信息错误代码定义如下（参见 https://www.php.net/manual/zh/features.file-upload.errors.php）：
UPLOAD_ERR_OK 其值为 0，没有错误发生，文件上传成功。 UPLOAD_ERR_INI_SIZE 其值为 1，上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值。 UPLOAD_ERR_FORM_SIZE 其值为 2，上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。 UPLOAD_ERR_PARTIAL 其值为 3，文件只有部分被上传。 UPLOAD_ERR_NO_FILE 其值为 4，没有文件被上传。 UPLOAD_ERR_NO_TMP_DIR 其值为 6，找不到临时文件夹。PHP 5.0.3 引进。 UPLOAD_ERR_CANT_WRITE 其值为 7，文件写入失败。PHP 5.1.0 引进。 UPLOAD_ERR_EXTENSION Value: 8; A PHP extension stopped the file upload. PHP does not provide a way to ascertain which extension caused the file upload to stop; examining the list of loaded extensions with phpinfo() may help. Introduced in PHP 5.2.0.
我们可以定义下面这样的函数，以获取错误信息的描述：
function codeToMessage($code) { switch ($code) { case UPLOAD_ERR_INI_SIZE: $message = "The uploaded file exceeds the upload_max_filesize directive in php.ini"; break; case UPLOAD_ERR_FORM_SIZE: $message = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form"; break; case UPLOAD_ERR_PARTIAL: $message = "The uploaded file was only partially uploaded"; break; case UPLOAD_ERR_NO_FILE: $message = "No file was uploaded"; break; case UPLOAD_ERR_NO_TMP_DIR: $message = "Missing a temporary folder"; break; case UPLOAD_ERR_CANT_WRITE: $message = "Failed to write file to disk"; break; case UPLOAD_ERR_EXTENSION: $message = "File upload stopped by extension"; break; default: $message = "Unknown upload error"; break; } return $message; }
这样，在处理文件上传时，可以显示错误信息的具体内容：
if ($_FILES['file']['error']){ $hasErr = true; $fileErr = '文件上传错误：'.codeToMessage($_FILES['file']['error']); }
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