Question

这很有效。事实是，如果用户没有选择文件，则会出错。如果没有选择文件，我怎么能不检查任何文件，如果选择了文件则只检查错误。

此功能位于<form>内，并在提交表单时运行。

if (empty($errors) === true){
    if (isset($_FILES['cover']) === true){
        $allowed = array('jpg', 'jpeg', 'gif', 'png');
        $file_name = $_FILES['cover']['name'];
        $file_size = getimagesize($_FILES['cover']['name']);
        $file_extn = strtolower(end(explode('.', $file_name)));
        $file_temp = $_FILES['cover']['tmp_name'];
        if(in_array($file_extn, $allowed) === true){            
            $file_path = 'images/cover/' . substr(md5(time()), 0, 10) . '.' . $file_extn;
            move_uploaded_file($file_temp, $file_path);
        }else{
                $errors[] = 'Incorrect file type. Only allowed: ' . implode(', ', $allowed) . '';                                       
            }
    }

Answer 1

也许这样的事情对你有用......

if (!empty($_FILES['cover'])){
if (empty($errors) === true){
    if (isset($_FILES['cover'])){
        $allowed = array('jpg', 'jpeg', 'gif', 'png');
        $file_name = $_FILES['cover']['name'];
        $file_size = getimagesize($_FILES['cover']['name']);
        $file_extn = strtolower(end(explode('.', $file_name)));
        $file_temp = $_FILES['cover']['tmp_name'];
        if(in_array($file_extn, $allowed) === true){            
            $file_path = 'images/cover/' . substr(md5(time()), 0, 10) . '.' . $file_extn;
            move_uploaded_file($file_temp, $file_path);
        }else{
                $errors[] = 'Incorrect file type. Only allowed: ' . implode(', ', $allowed) . '';                                       
            }
    } 

}

Answer 2

测试它或其余数据是否设置为空？如何？

if (!empty($_FILES['cover'])) {
    if ($_FILES['cover']['name'] != "") {
        // execute your code here

    } else if ($_FILES['cover']['name'] == "") {
        // do nothing
        // or header them to the appropriate page
        header("location: http://yourpage.com");
        exit();
    }
}

我添加了这个以查看我们是否在同一页面上。

if (!empty($_FILES['cover'])){
    if ( $_FILES['cover']['name'] != "") {
        $file_name = $_FILES['cover']['name'];    
        // etc
        // then the rest of your code

    } else {
        // do nothing

    }
} else {
    // do nothing or header to appropriate location and exit
    header("location: http://yourpage.com");
    exit();
}

好的，试试这个：

if(!empty($_FILES['cover'])) {
    if($_FILES['cover']['tmp_name'] != "") {
        $fileName     = $_FILES["cover"]["name"];
        $fileTmpLoc   = $_FILES["cover"]["tmp_name"];
        $fileType     = $_FILES["cover"]["type"];
        $fileSize     = $_FILES["cover"]["size"];
        $fileErrorMsg = $_FILES["cover"]["error"];
        $boomBoom     = explode(".", $fileName);
        $fileExt      = end($boomBoom);

        // this next if is okay because if a new file is not selected 
        // the script wouldn't make it this far anyway
        // so this will not require a new selection
        // just a check that should pass every time

        if (!$fileTmpLoc){
            echo "ERROR: Please browse for a file before uploading";
            exit();
        }
        else if($fileSize > 20480000){
            echo "ERROR: Your file was larger than 20 Megabytes";
            unlink($fileTmpLoc);
            exit();
        }
        else if (!preg_match("/.(gif|jpg|png|jpeg)$/i", $fileName)){
            echo "ERROR: Your image was not .gif, .jpg, .jpeg, or .png.";
            unlink($fileTmpLoc);
            exit();
        }
        else if ($fileErrorMsg == 1){
            echo "ERROR: An error occurred.";
            exit();
        }

        move_uploaded_file($_FILES['cover']['tmp_name'], "pathTo/$fileName");
        header("location: http://www.yoursite.com");
        exit();
    }
}

如果没有选择文件，则不执行任何操作

2 个答案: