Things to note when uploading files in PHP under Linux

chmod -R 777 html

Modify a directory to give any user write, read and execute permissions

chmod a+rwx html

2. Set the root directory of uploaded files

siteRoot = dirname(__file__); //Get the project root directory

3. Modify the upload size of the configuration file php.ini

post_max_size = 200M
upload_max_filesize = 200M

4. If you want to create folders based on time and then upload files, you need

$aimUrl = str_replace('\', '/', $aimUrl);
$aimDir = '';
$arr = explode('/', $aimUrl);
foreach ($arr as $str)
{
$aimDir .= $str . '/';
if (!file_exists($aimDir)) {
 mkdir($aimDir);
 chmod($aimDir, 0777);
 }
}