What potential issues could arise when using readfile() to open a PHP file on the server?

One potential issue that could arise when using readfile() to open a PHP file on the server is that the file may not be found or accessible due to incorrect file path or permissions. To solve this issue, you can first check if the file exists and is readable before attempting to open it with readfile(). 

$file = 'path/to/file.php';

if (file_exists($file) && is_readable($file)) {
    readfile($file);
} else {
    echo 'File not found or not readable.';
}

Keywords

readfile PHP file server security vulnerabilities file permissions

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