PDO MySQL Prepared Statements

<?php
$dsn = 'mysql:host=localhost;dbname=dbpdo';
$user = 'gean';
$pass = '123456';
 
$conexao = new PDO($dsn, $user, $pass);
$conexao->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
var_dump($conexao);
 
echo '<hr>';
 
/* Inserção de registro */
// $valores = "('Alice', 'alice@exemplo.org', '123456'),('Bob', 'bob@exemplo.org', '123456')";
 
// $insert = "INSERT INTO usuarios(nome, email, senha) VALUES(?, ?, ?)";
// $execInsert = $conexao->prepare($insert);
// $valores = [
// 'Alice',
// 'alice@exemplo.org',
// '321456'
// ];
// $execInsert->execute($valores);
// var_dump($execInsert);
 
$insert = "INSERT INTO usuarios(nome, email, senha) VALUES(?, ?, ?)";
$execInsert = $conexao->prepare($insert);
 
for ($x = 0; $x <= 3; $x ++) {
    $valores = [
        "Alice $x",
        "alice_$x@exemplo.org",
        "321456"
    ];
    $execInsert->execute($valores);
}
 
var_dump($execInsert);
 
echo '<hr>';
 
$select = "SELECT * FROM usuarios WHERE id = ?";
$pdoSt = $conexao->prepare($select);
$pdoSt->execute([1]);
$result = $pdoSt->fetch(PDO::FETCH_ASSOC);
echo '<pre>';
print_r($result);
echo '</pre>';
 
echo '<hr>';
 
$select = "SELECT * FROM usuarios WHERE id > ?";
$pdoSt = $conexao->prepare($select);
$pdoSt->execute([10]);
$result = $pdoSt->fetchAll(PDO::FETCH_ASSOC);
echo '<pre>';
print_r($result);
echo '</pre>';