- var_dump: documentation ( source)
<?php
$pdo = new PDO('sqlite::memory:');
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->exec("CREATE TABLE foo(
field1 CHAR(10),
field2 CHAR(10)
)");
$pdo->exec("INSERT INTO foo VALUES ('row1field1', 'row1field2')");
$pdo->exec("INSERT INTO foo VALUES ('row2field1', 'row2field2')");
$statement = $pdo->query("SELECT * FROM foo WHERE `field1` = ?");
$statement->execute(['row1field1']);
var_dump($results->fetchAll());