PHP：如果没有选择文件，如何跳过上传文件

Question

我有这个 PHP 脚本，它可以将表单的内容与图像一起上传到数据库中。现在，我想让它在选择时上传所有内容（工作）并跳过上传图片部分并上传除图片以外的所有内容。

下面是上传图片到服务器的部分。

$time = time();
$uploader = $_SESSION['username'];
$target_dir = "../uploads/";
$target_file = $target_dir . $uploader . $time. basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

if(isset($_POST["addpost-btn"])){

$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
    echo "File is an image - " . $check["mime"] . ".";
    $uploadOk = 1;
} else {
    echo "File is not an image.";
    $uploadOk = 0;
}
}
// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 2000000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
//the rest is a database insert that works

当我尝试插入没有返回图像的表单内容时：

警告：getimagesize(): 第 14 行 C:\xampp\htdocs\vinhub\inc\addpost.inc.php 中的文件名不能为空

文件不是图像。抱歉，只允许使用 JPG、JPEG、PNG 和 GIF 文件。抱歉，您的文件未上传。

第 14 行是 $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);

我认为这是因为它需要选择文件，但我如何绕过它并在没有图像的情况下继续插入？

任何帮助将不胜感激，在此先感谢您

Answer 1

虽然 Andrea 的解决方案效果很好，但我仍然需要在数据库中插入正确的路径。路径在$target_file 中指定，因此初始为$photo = $target_file。无论文件是否上传，这都会插入路径。

我的解决方案是：

if (is_uploaded_file($_FILES['fileToupload']['tmp_name'])) {
    $photo = $target_file;
 } else {
    $photo = '';
 }

检查文件是否实际上传并采取相应措施。 感谢大家的帮助！

Answer 2

您的getimagesize() 部分代码没有任何问题。如果没有图像文件，它只会向您发送警告。该警告不会中断代码运行。

但这里可能存在问题：

} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
//the rest is a database insert that works

在//the rest is a database insert that works之前没有关闭}

这意味着只有在$uploadOk == 1 时才会进行数据库插入。

因此，如果您仍想进行数据库插入（文件是否已上传），则需要将此代码修复为：

if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
} //added brace

//database insertion here

Answer 3

尝试检查 isset($_FILES["fileToUpload"])

<?php

$time = time();
$uploader = $_SESSION['username'];
$target_dir = "../uploads/";

if (isset($_FILES["fileToUpload"])) {
    $target_file = $target_dir . $uploader . $time . basename($_FILES["fileToUpload"]["name"]);
    $uploadOk = 1;
    $imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));

    if (isset($_POST["addpost-btn"])) {

        $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
        if ($check !== false) {
            echo "File is an image - " . $check["mime"] . ".";
            $uploadOk = 1;
        } else {
            echo "File is not an image.";
            $uploadOk = 0;
        }
    }
// Check if file already exists
    if (file_exists($target_file)) {
        echo "Sorry, file already exists.";
        $uploadOk = 0;
    }
// Check file size
    if ($_FILES["fileToUpload"]["size"] > 2000000) {
        echo "Sorry, your file is too large.";
        $uploadOk = 0;
    }
// Allow certain file formats
    if ($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" && $imageFileType != "gif") {
        echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
        $uploadOk = 0;
    }
// Check if $uploadOk is set to 0 by an error
    if ($uploadOk == 0) {
        echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
    } else {
        if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
            echo "The file " . basename($_FILES["fileToUpload"]["name"]) . " has been uploaded.";
        } else {
            echo "Sorry, there was an error uploading your file.";
        }
        //the rest is a database insert that works
    }
}