Codeigniter file_put_contents：无法打开流：权限被拒绝

Question

在服务器中上传图像时，我在 codeigniter 中遇到错误。但它在本地系统中运行良好。

遇到 PHP 错误：

Severity: Warning

Message: file_put_contents(upload/logo/1617000545.png): failed to open stream: Permission denied

Filename: models/Logo_m.php

行号：41

    list($type, $data) = explode(';', $data);
        list(, $data) = explode(',', $data);
       
        $data = base64_decode($data);
        $imageName = time().'.png';

        file_put_contents('upload/logo/'.$imageName, $data);````

Answer 1

您是否检查过您的目录或权限？

一些问题可能导致：

1. 目录不存在，必须先创建。
2. 权限/脚本没有足够的权限来写文件，你必须验证应用程序可以写目录并且目录是可写的。

您的代码也不会验证图像​​内容/元数据；

// $data = trim(explode(',', explode(';', $data)[1])[1]);
list($type, $data) = explode(';', $data);
list(, $data) = explode(',', $data);
$data = base64_decode($data);
// determine absolute path
$imageDirectory = __DIR__ .'/upload/logo';
// check if string / content is an image
if (! ($imgInfo = getimagesizefromstring($data))) {
    // do exit here because data is not a binary image string
    throw new Exception('Data is not an image');
}
// check if image directory exist
if (!file_exists($imageDirectory)) {
    mkdir($imageDirectory, 755, true);
}
if (!is_dir($imageDirectory) || !is_writable($imageDirectory)) {
    throw new Exception('Could not save image. Directory is not writable.');
}

$extension = $imgInfo['mime'];
// optional to filter jpeg image
if ($extension  === 'jpeg') {
    $extension = 'jpg';
}
// use only time is not recommended due time is not unique, please change with random value
$baseName = time();
$imageName = $baseName . '.' . $extension;
$written   = file_put_contents($imageDirectory.'/'.$imageName, $data);