Language: PHP
Label: safe
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
    public function put($string)
    {
        if (!$this->handle) $this->open('a');
        return $this->fs->fwrite($this->handle, $string);
    }