How to insert multiple textbox values into database in php

How to insert multiple textbox values into database in php

<?php   
$post_count = count($_POST['textfield']); //count textfield values
$post1 = array(); //create array
$post2 = array();
$post1 = $_POST['textfield'];
$post2 = $_POST['textfield2'];
for ($i = 0; $i <= $post_count; $i++) {
    $sql[] = "INSERT INTO practice (test,test2) VALUES ('".$post1[$i]."','".$post2[$i]."')";
}
foreach ($sql as $query) {
    mysqli_query($con, $query);
}
?>