DbConnect dlTask = new DbConnect();

 if (tabActifChoisis.length == 3) {

     String pa = tabActifChoisis[0];
     dlTask.execute(sexe, age, formule, base, pa);
 }

public class DbConnect extends AsyncTask<String, Void, String> {

    protected String doInBackground(String... param) {

        ArrayList<NameValuePair> nameValuePairs = new ArrayList<>();

        nameValuePairs.add(new BasicNameValuePair("sexe", param[0].toString()));
        nameValuePairs.add(new BasicNameValuePair("age", param[1].toString()));
        nameValuePairs.add(new BasicNameValuePair("formule", param[2].toString()));
        nameValuePairs.add(new BasicNameValuePair("base", param[3].toString()));
        nameValuePairs.add(new BasicNameValuePair("pa", param[4].toString()));

        try {
            HttpClient client = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://10.0.2.2/AppBdd.php");
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            client.execute(httppost);
        } catch (Exception e) {
            Log.e("log_tag", "Error in http connection " + e.toString());
        }

        return null;
    }

}

<?php
require_once ("rees.php");

$pdo = PdoGsb::getPdoGsb();


$sexe = $_REQUEST['sexe'];
$age = $_REQUEST['age'];
$form  = $_REQUEST['formule'];
$base = $_REQUEST['base'];
$pa  = $_REQUEST['pa'];

$pdo->setClient($sexe, $age, $form, $base, $pa);

<?php

class PdoGsb{
    private static $serveur='mysql:host=localhost';
    private static $bdd='dbname=testdepeau';
    private static $user='root';
    private static $mdp='';
    private static $monPdo;
    private static $monPdoGsb=null;

    private function __construct(){
        PdoGsb::$monPdo = new PDO(PdoGsb::$serveur.';'.PdoGsb::$bdd, PdoGsb::$user, PdoGsb::$mdp);
        PdoGsb::$monPdo->query("SET CHARACTER SET utf8");
        PdoGsb::$monPdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    }

    public function __destruct(){
        PdoGsb::$monPdo = null;
    }

    public  static function getPdoGsb(){
        if(PdoGsb::$monPdoGsb==null){
            PdoGsb::$monPdoGsb= new PdoGsb();
        }
        return PdoGsb::$monPdoGsb;
    }

    public function setClient($sexe, $age, $form, $base, $pa){
        $req="INSERT INTO client (formule, sexe, age, base, pa)
         VALUES
         ('$form', '$sexe', '$age', '$base', '$pa');";
         $res2= PdoGsb::$monPdo->exec($req);
    }

}
?>