Formulaire methode GET et résultat du fichier PHP

<!--  ******   FORMULAIRE 1: SELECTION OUTIL A MODIFIER  ******  -->    
    <form id='idFormModifier1' action="modifier1.php"  method="get"
     target="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
          <div class = legendeM >
              <p id = 'legendeM1'>Indiquer n° ordre ou réference magasin</p>
              <!--  ******   CHOIX NUMERO ORDRE    ******  --> 
              <div class="classNumIdM">
                <label id='idLblNumIdM' For='idInputNumIdM'>N° ORDRE: </label>
                <input id = "idInputNumIdM"  name = "IdM" onchange = "blockRefMag" 
                 type = "number"  min = "100001" max = "102000" placeholder = 'Numéro Ordre: '>      
              </div>
              <!--  ******   CHOIX NUMERO MAGASIN    ******  --> 
              <div class="classNumMagM">
                <label id='idLblRefMagM' For='idInputRefMagM'>REF MAGASIN</label>
                <input id = "idInputRefMagM"  name = "refMagM" onchange = "blockNumId" 
                 type = "number"  step = "1" min = "0" placeholder = 'Référence magasin: '>      
              </div>
               <!--  BOUTON VALIDER RECHERCHE  --> 
                <button id = "idboutonRechercheModif" class = 'classboutonRechercheModif'
                 type = "submit">CHOIX</button>
                <p class="error">UNE ENTREE EST DEMANDEE</p>  
          </div>
    </form>

<?php
header("Content-Type: application/json; charset=UTF-8");

error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);

//--------------------------------------------------------------------------//
// fonctions diverses...
//--------------------------------------------------------------------------//
$entreeErr = $errIdM =  $errRefMagM = 0;
if (empty($_GET["IdM"]) && empty($_GET["refMagM"])){
    $entreeErr = "UNE ENTREE EST DEMANDEE";
  };

if (!filter_input(INPUT_GET, "IdM", FILTER_VALIDATE_INT,
    array("options" => array("min_range"=>100001, "max_range"=>102000))) === false){
    $errIdM = ("IdM NON VALIDE");
    };
if (!filter_input(INPUT_GET, "refMagM", FILTER_VALIDATE_INT)){
    $errRefMagM = ("refMag NON VALIDE");
    };

//--------------------------------------------------------------------------//
// Variables ..
//--------------------------------------------------------------------------//
$VM = $VM0 = $VM1= "";   
$VM0 = $_GET["IdM"];                                  
$VM1 = $_GET["refMagM"];

if ($VM0==""){
    $VM = $VM1;
    $condition = "REF_MAG";
    }else{$VM = $VM0;
    $condition = "id";
    };
//echo $VM ;
$datas = array();
$datas[":IdM"] = $VM0;
$datas[":refMag"] = $VM1;

//--------------------------------------------------------------------------//
//connexion à la bdd
//--------------------------------------------------------------------------//
require_once "cnxbdd.php";
        
//--------------------------------------------------------------------------//
//  REQUETE                                       
//--------------------------------------------------------------------------//

$sql = 'SELECT id FROM cutting_tools_01
        WHERE NOT ' .$condition .' = ' .$VM;

try{             
	$requete = $connexion->prepare($sql); // A corriger en fonction du contenu de ton fichier cnxbdd.php  
	$requete->execute($datas);                                                                    
	$resultatM1 = $requete->fetchAll(PDO::FETCH_ASSOC);      
}catch(PDOException $e){
	echo 'ECHEC  : ' .$e->getMessage();
}

print_r($resultatM1);