Question

我在实现多个if else语句时遇到了麻烦。我收到了一个意外的错误。

基本上我需要检查一个文件是否已经输入，如果已经输入，则需要检查它是否超过最大大小限制等，那么如果它满足所有条件，则需要检查它是否无论是jpeg，jpg还是png文件类型，最后数据库都会更新。

<?php
//this file uses the fields posted from the activity.html
//and stores it in the product_images table

$fileupload = $_FILES['userfile']['name'];
$filetype = $_FILES['userfile']['type'];
$filesize = $_FILES['userfile']['size'];
$tempname = $_FILES['userfile']['tmp_name'];
$filelocation = "images/$fileupload";

//make sure a file has been entered
if($tempname == "none") {
    echo "<p>You must enter a file " . mysqli_error($conn) . "</p>" ;
}
else
    {
        if (!move_uploaded_file($tempname,$filelocation)) {
            switch ($_FILES['userfile']['error'])
                {

                case UPLOAD_ERR_INI_SIZE:
                    echo "<p>Error: File exceeds the maximum size limit set by the server</p>" ;
                    break;

                case UPLOAD_ERR_FORM_SIZE:
                    echo "<p>Error: File exceeds the maximum size limit set by the browser</p>" ;
                    break;

                case UPLOAD_ERR_NO_FILE:
                    echo "<p>Error: No file uploaded</p>" ;
                    break;

                default:
                    echo "<p>File could not be uploaded </p>" ;
                }
    }
    else
            {
        if (($_FILES['userfile']['type'] == "image/jpeg") || ($_FILES['userfile']['type']== "image/jpg") || ($_FILES['userfile']['type']== "image/png") ){

                    //image file is valid
                }
            }
        else
            {
        echo"Please upload file in one of these formats: jpeg,jpg or png.<a href='activity12-1.html'>Upload a file</a>";
            }
    }
else{
    //Open the company database and make sure the product_images table is present
    include ('companyDB.php');

    $dbQuery = "INSERT INTO product_images(imageurl) VALUES ('$filelocation')";

    if (mysqli_query($conn, $dbQuery))
        {
            echo"<h1>File Uploaded</h1>";
            echo"<p><img src='$filelocation' height='281' width='500'></p>";
            echo"The details of the uploaded file are shown below:<br/>";
            echo"<b>File Name: </b>$fileupload<br/> ";
            echo"<b>File type: </b>$filetype<br/> ";
            echo"<b>File size: </b>$filesize bytes<br/> ";
            echo"<b>Uploaded to: </b>$tempname<br/> ";
            echo"<a href='activity12-1.html'>Add Another file</a>";
        }
    else
        {
            echo "<p>Couldn't add the file to the database " . mysqli_error($conn) . "</p>" ;
        }
}
}
?>

Answer 1

你错过了一个结束大括号。

这：

            default:
                echo "<p>File could not be uploaded </p>" ;
        }
}
else
{

应该是这样的：

            default:
                echo "<p>File could not be uploaded </p>" ;
        }
    }
}
else
{

这就是保持缩进一致性很重要的原因。

Answer 2

根据我的说法if-else语法是这样的：

if(condition)
{

}   
else if(condition)
{

}
else if(condition)
{

}
else
{

}

你错过了@line 44的代码

else
{
    if (($_FILES['userfile']['type'] == "image/jpeg") || ($_FILES['userfile']['type']== "image/jpg") || ($_FILES['userfile']['type']== "image/png") ){

//image file is valid
    }
}
else
{
    echo"Please upload file in one of these formats: jpeg,jpg or png.<a href='activity12-1.html'>Upload a file</a>";
    }
}
else{
        //

与多个if / else语句混淆

2 个答案: