I know that I can do something like
$int = (int)99; //(int) has a maximum or 99
To set the variable $int to an integer and give it a value of 99.
Is there a way to set the type to something like LongBlob in MySQL for LARGE Integers in PHP?
No. PHP does what is called automatic type conversion.
In your example
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.