PHP does not communicate with MySQL

Question

I have been messing with this problem for days now. I use a PHP script to enter data into a MySQL database, I get a blank page, or it says it did it, but nothing changes in MySQL. I tried updating from older programs, installing all 32 bit, and installing all 64 bit software. Now that I've updated once and redone everything twice, I am certain I have problem in Windows, but I do not have any idea where to search. I will show you a script I am using, but I know it's a working script as I've used it to test other servers. A major barrier to finding a solution to the problem though, is that every time I find someone with my problem it is largely assumed the script is the problem, I have no error codes, this particular script even says "SUCCESS!"

System: Windows 7 Home Premium SP1 x64 Apache 2.4.7 VC11 x64 PHP 5.5.7 VC11 x64 MySQL Server 5.6.12

Script:

<?php  // mysql-pdo-test.php
try {
  $user = "[censored]"; $pass = "[censored]";

  echo "-->connect and select database\n";
  $dbh = new PDO('mysql:host=projectedin.local;dbname=test', $user, $pass);

  # activate exception generation
  $dbh->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );

  echo "<br />-->create table:\n";
  $dbh->exec( "CREATE TABLE IF NOT EXISTS test_tab (thing VARCHAR(10))" );

  echo "<br />-->insert into table:\n";
  $dbh->exec( "INSERT INTO test_tab VALUES ('book'),('pencil')" );

  echo "<br />-->select from table:\n";
  $res = $dbh->query( "SELECT thing FROM test_tab" );
  foreach ($res as $row) {
    echo $row['thing'], " ";
  }

  echo "<br />-->drop table:\n";
  $dbh->exec( "DROP TABLE test_tab" );
  echo "<br />SUCCESS!";

  // disconnect
  $dbh = null;
} 
catch (PDOException $e) {
  die( "<h4>Error: " . $e->getMessage() . "</h4>" );
}
?>

Answer 1

This:

$dbh->exec( "INSERT INTO test_tab VALUES ('book'),('pencil')" );

is not valid. Should be:

$dbh->exec( "INSERT INTO test_tab VALUES ('book', 'pencil')" );

Not sure if that's causing your problem, but it sure isn't helping.