php - 未选择图像文件时无法停止处理表格

Question

我有一个用于提交包含图像的新帖子的表单。如果用户未选择要上传的图像，我不希望该帖子继续将数据提交到服务器和数据库。目前，我尝试的所有工作都是让代码继续处理表单。

这是我的一些代码:

//check if the submit button has been clicked
        if( isset( $_POST['submit'] ) ){

            //validate the title and description
            $title = validate_title($_POST['title']);
            $desc = validate_desc($_POST['desc']);

            //Get other posted variables
            $cat = $_POST['cat'];
            $year = $_POST['year'];

            if($title && $desc != false){

                //check if an image has been submitted
                if( $_FILES['files']['name'] != ""){...

我也尝试使用以下方法，但是在未选择文件时都不会停止代码:

if( $_FILES['files']['error'] == UPLOAD_ERR_OK){...

if( $_FILES['files']['name'] != UPLOAD_ERR_NO_FILE){...

Answer 1

看起来您的文件输入名称是files[]，在这种情况下，$ _FILES [“files”] [“name”]将是一个数组，用于检查用户是否提供了要上传尝试的图像，

foreach ($_FILES['files']["error"] as $index => $error){
    if ($error == UPLOAD_ERR_NO_FILE){
        //no file was uploaded in $index`th file input 
    }
    else{
        //other checks and process $_FILES['files']['tmp_name'][$index]
    }
}