How to name variables

Question

• What rules do you use to name your variables?
• Where are single letter vars allowed?
• How much info do you put in the name?
• How about for exam

Answer 1

I do a lot of php in nowadays, It was not always like that though and I have learned a couple of tricks when it comes to variable naming.

//this is my string variable $strVar = "";

//this would represent an array $arrCards = array();

//this is for an integer $intTotal = NULL:

//object $objDB = new database_class();

//boolean $blValid = true;