Exercices et corriger JAVA, C, C++,python, PHP

<? class functions {     private $table;     private $db;     public function __construct($table = "patient")     {         $this->table = $table;         $this->db = new Database();     }     // Ici la suite du code     function sanitize_my_email($field) {     $field = filter_var($field, FILTER_SANITIZE_EMAIL);     if (filter_var($field, FILTER_VALIDATE_EMAIL)) {       return true;     } else {       return false;     }     } // Envoyer un email     public function sendmail($to_email,$subject,$message,$headers)     {             $to =$to_email;             $sujet =$subject;             $msg =$message;             $head =$headers;             //check if the email address is invalid $secure_check             $secure_check = sanitize_my_email($to_email);             if ($secure_check == false) {                 echo "Invalid input";             } else { //send email                 mail($to, $sujet, $msg, $head);