Is there anyway to send a json array to server sid

i am using ANgular 8 in client side and PHP 7 in server side . i had problem to use the values of that array to insert them by query .

i displayed the array by print_r and it show something like this:

Array
(
    [0] => stdClass Object
        (
            [idprod] => 8
            [prix] => 2
            [qte] => 1
            [refCmd] => 35
        )

    [1] => stdClass Object
        (
            [idprod] => 9
            [prix] => 2.4
            [qte] => 5
            [refCmd] => 35
        )

)

the question is how to insert every object of that array in table called regrouper ?

<?php

header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Credentials: true ");
header('Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS');
header("Access-Control-Allow-Headers: X-Custom-Header, Origin, Content- 
Type , Authorisation , X-Requested-With");
header("Content-Type: application/json; charset=UTF-8 ");
$json = file_get_contents('php://input');
$decoded = json_decode($json);

$tab = $decoded->tab;
function conn()
{
$dbhost = "localhost";
$user = "root";
$pass = "";
$db = "smart";
$conn = new PDO('mysql:host=localhost;dbname=smart', $user, $pass);
return $conn;
}
$db = conn();
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$p = $db->prepare("INSERT INTO regrouper (refCommande, refProduit, prixP, 
qteP) VALUES(:refCmd,:refProduit,:prix,qte)");
foreach ($tab as $item) {
$p->execute([json_decode($item)]);
}
echo json_encode(true);
?>

i expect the table regrouper to have the first object on a row and the second object in another row

You don't need to call json_decode() twice. You already decoded it when you did

$decoded = json_decode($json);

so you don't need to use json_decode($item) when inserting.

Use the true second argument to json_decode() so that it creates an associative array instead of an object for each item. Then you can pass that array to $p->execute() directly. You also need to use $decoded['tab'] instead of $decoded->tab.

<?php

header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Credentials: true ");
header('Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS');
header("Access-Control-Allow-Headers: X-Custom-Header, Origin, Content- 
Type , Authorisation , X-Requested-With");
header("Content-Type: application/json; charset=UTF-8 ");
$json = file_get_contents('php://input');
$decoded = json_decode($json, true);

$tab = $decoded['tab'];
function conn()
{
    $dbhost = "localhost";
    $user = "root";
    $pass = "";
    $db = "smart";
    $conn = new PDO('mysql:host=localhost;dbname=smart', $user, $pass);
    return $conn;
}
$db = conn();
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$p = $db->prepare("INSERT INTO regrouper (refCommande, refProduit, prixP, qteP)
                   VALUES(:refCmd,:refProduit,:prix,qte)");
foreach ($tab as $item) {
    $p->execute($item);
}
echo json_encode(true);