如何检查文件输入字段是否为空? [英] How to check if the file input field is empty?

问题描述

我很难使用$_FILES

我想检查文件上载字段是否为空，然后应用一个条件，使得如果文件上载为空，则脚本不会尝试上载文件.我该如何执行?

I want to check if file upload field is empty or not then apply a condition such that if file upload is empty then the script doesn't try uploading the file. How do I enforce this?

推荐答案

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

也有

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

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