如何检查文件字段是否为空？ [英] how to check if the file field is empty?

问题描述

我很难用 $ _ FILES

我想检查它是否为空，如果它不是空的，那么它不应该尝试上传文件。如何检查这个？

I want to check if it's empty or not and if it's not empty then it shouldn't try and uploading the file. How do I check this?

推荐答案

if($_FILES["file"]["error"] != 0) {
//stands for any kind of errors happen during the uploading
} 

也有

also there is

if($_FILES["file"]["error"] == 4) {
//means there is no file uploaded
}

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