Insertion avec array associatif

//récupération PROPRE des variables
//$tonArray = !empty($_POST['tonarray']) ? $_POST['tonarray'] : NULL;

//pour les tests :
$tonArray = array('champ1'=>'valeur1', 'champ2'=>'valeur2');

$strFields = "";
$strKeys = "";

$arrFields = array();
$arrkeys = array();
$arrDatas = array();

if($tonArray){
 foreach($tonArray as $K=>$V){
   $arrFields[] = $K;
   $arrkeys[] = ':'.$K;
   $arrDatas[':'.$K]=>$V;
 }    
  
 $strFields = join(',',$arrFields);
 $strKeys = join(',',$arrkeys);
 
 $sql = "INSERT INTO tatable ($strFields) VALUES($strKeys);"  
 
  try {
    $prep = $bdd->prepare($sql);
    $prep->execute($arrDatas);
  }catch(Exception $e){
    echo "Erreur ! ".$e->getMessage();
  }
 
}