move_uploaded_file() 抛出错误

Question

好的，非常简单的 w3schools 上传脚本，我尝试实现，但一直收到错误消息。

作为参考，我使用的是 WordPress，需要创建自定义上传方法，所以我不能使用自定义字段等。

关于此的 HTML 部分：

<form method="post" id="form" enctype="multipart/form-data">
                <input type="file" name="frontImage" id="frontImage">

PHP 方面：

$target_dir = home_url() . "/wp-content/uploads/survey/";
        $target_file = $target_dir . basename($_FILES["frontImage"]["name"]);
        $uploadOk = 1;
        $imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image

            $check = getimagesize($_FILES["frontImage"]["tmp_name"]);
            if($check !== false) {
                $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["frontImage"]["size"] > 500000) {
            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["frontImage"]["tmp_name"], $target_file)) {
                echo "The file ". basename( $_FILES["frontImage"]["name"]). " has been uploaded.";
            } else {
                echo "Sorry, there was an error uploading your file.";
            }
        }

好的，我得到的错误是：

"Sorry, there was an error uploading your file."

这意味着 move_uploaded_file() 部分失败。

如果我 print_r($_FILES) 我得到：

Array
(
    [frontImage] => Array
        (
            [name] => Everest_kalapatthar_crop.jpg
            [type] => image/jpeg
            [tmp_name] => /Applications/MAMP/tmp/php/phpHw9BcP
            [error] => 0
            [size] => 93053
        )

)

这有什么不工作的原因吗？

Answer 1

使用此代码测试您的目标目录是否确实存在可写。

如果您的目标目录不可写，在 Mac 上，您可以在终端中运行它。

ls -lah /full/path/to/the/survey/directory

并检查组和所有者，它应该由 _www 拥有，就像您网站中的其他目录一样。如果您的 Apache 用户不同，请根据需要进行调整。

如果不是，则运行以下命令：
sudo chown _www:_www /full/path/to/the/survey/directory/
sudo chmod 0755 /full/path/to/the/survey/directory/

<?php

$target_dir = home_url() . "/wp-content/uploads/survey/";
$target_file = $target_dir . basename($_FILES["frontImage"]["name"]);

// check if dir is writable    
if ( !is_writable($target_dir)) {
    echo $target_dir . ' is not writable';
}
else {
    // proceed to write the file there
    // either set a boolean flag $writable = 1 or 
    // insert into if/else chain
}

// check if dir exists
if (!file_exists($target_dir)){
    echo $target_dir . ' does not exist';
}
else {
    // proceed with the rest of your logic
    // either set a boolean flag $dirExists = 1 or
    // insert this into your if/else chain
}