PHP defining functions in classes

Question

Very simple question here. Doing my first OO programming in PHP, more used to Java & C#.

With this class definition:

class RouteParser {
    var $DEBUG = 1;

    function parse($from, $to, $route){
        debug("test");
        debug("test again");
    }

    function debug($arg) {
        if($DEBUG) {
            echo "<pre>DEBUG: " . print_r($arg) . "</pre>";
        }
    }
}

And this executing code:

include("RouteParser.php");
$rp = new RouteParser();
$return = $rp->parse("from","to","test");

I'm getting the error:

Fatal error: Call to undefined function debug() in C:\xampplite\htdocs\routeparse\RouteParser.php on line 7

PHP doesn't support function prototypes as far as I can tell, so I'm stumped on how to tell one class function that another class function exists... according to what I found on the PHP documentation, this is only an issue if the function is inside a conditional (which makes sense)...

goto-bus-stop · Accepted Answer · 2011-01-27 19:52:28Z

11

Use $this->debug() instead. $this makes PHP look for the function in the class itself, while just debug() makes PHP look for a function called debug in the global scope.

answered Jan 27, 2011 at 19:52

goto-bus-stop

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2 Comments

tkrajcar Over a year ago

Ahh, that makes sense. Well, it doesn't, compared to other languages, but I understand what you are saying... ;-)

KingCrunch Over a year ago

If the method is static, you would refer to it inside the class itself with self::debug().

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