design patterns - Running code in a PHP once -

i'm trying write class in php acts wrapper collection of command line tools make them easier use php.

i have single class (myclass) in file myclass.php.

i have code checks see if required tools installed , sets constant (tools_available) either true or false. although it's not lot of code, want run first time tries instantiate class or use of static functions. what's best practice handling this?

i want run first time tries instantiate class or use of static functions.

well, best answer not have static methods. can stick code in constructor method per answer @treegarden.

if must have static methods, you'll need static flag within class indicate when you've called 'run once' code, can avoid running again. , call explicitly each of static methods , constructor. this:

<?php class myclass {     private static $hasrunonce = false;      private static runmeonce()     {         if (!self::$hasrunonce) {             self::$hasrunonce = true;             //put 'run once' code here...         }     }      public static oneofyourstaticmethods()     {         self::runmeonce();         //put static method code here...         //this same each of static methods , constructor.     } } 

hope helps.