What are the potential issues with using the chmod function in PHP to change directory permissions?

One potential issue with using the chmod function in PHP to change directory permissions is that it may not work due to insufficient permissions or incorrect path provided. To solve this issue, you can use the realpath function to get the absolute path of the directory and then use the chmod function to change its permissions. 

$directory = '/path/to/directory';
$absolute_path = realpath($directory);

if($absolute_path){
    chmod($absolute_path, 0755);
    echo "Directory permissions changed successfully.";
} else {
    echo "Invalid directory path.";
}

Keywords

chmod directory permissions security vulnerabilities file system PHP functions

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