<p>I know that I can do something like</p>

<pre><code>$int = (int)99; //(int) has a maximum or 99
</code></pre>

<p>To set the variable <code>$int</code> to an integer and give it a value of <code>99</code>. </p>

<p>Is there a way to set the type to something like <code>LongBlob</code> in MySQL for <code>LARGE</code> Integers in PHP?</p>

No. PHP does what is called automatic type conversion.
In your example
```
```
$int = (int)123;
```
```
the "(int)" just assures that at that exact moment 123 will be handled as an int.
I think your best bet would be to use a class to provide some sort of type safety.