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<?php
$dsn = 'mysql:dbname=testdb;host=127.0.0.1';
$user = 'dbuser';
$password = 'dbpass';

try {
    $dbh = new PDO($dsn, $user, $password);
    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}
?>

<?php
$dsn = 'mysql:dbname=test;host=127.0.0.1';
$user = 'googleguy';
$password = 'googleguy';

/*
    Using try/catch around the constructor is still effective even if ERRMODE is set to WARNING,
    because if the connection fails, PDO::__construct will always throw a PDOException exception.
*/
try {
    $dbh = new PDO($dsn, $user, $password, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_WARNING));
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
    exit;
}

// This will cause PDO to throw an E_WARNING level error instead of an exception (when the table does not exist)
$dbh->query("SELECT wrongcolumn FROM wrongtable");
?>

Warning: PDO::query(): SQLSTATE[42S02]: Base table or view not found: 1146 Table 'test.wrongtable' doesn't exist in
/tmp/pdo_test.php on line 18
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