[PHP] Re: Dynamic method calling

[Justin Patrin]

Darren Beale wrote:

Hi

I'm trying to dynamically choose and call a method from within a class 
but actually calling a method dynamically does not seem to work whatever 
I try using php 4.3.3

Hopefully this test script will illustrate my point better, I always get 
to the "I know we get to here" bit, but there is no other output.

Is what I want to achieve possible?

regs

Darren

<?php

class foo
{
    var $lookup;
    
    function foo()
    {
        $this->lookup  = array();
    }

    function getItem($entry)
    {
        if (!array_key_exists($entry, $this->lookup))
        {
            print "I know we get to here\r\n";
           
            // random attempts at calling the 
relevant                     // method
           
            $this->{"_foo_" . $entry . "()"};
           
            $this->{"_foo_" . $entry};
           
            $this->${"_foo_" . $entry . "()"};
           
            $foo = "_foo_" . $entry . "()";
            $this->$$foo;
           
            $foo = "_foo_" . $entry;
            $this->$$foo;
        }
        return $this->lookup[$entry];
    }

    function _foo_bar()
    {   
        print "bar\r\n";
        $bar = 1;
        $this->lookup["bar"] = $bar;
        unset($bar);
    }

    function _foo_bar2()
    {   
        print "bar2\r\n";
        $bar2 = 2;
        $this->lookup["bar2"] = $bar2;
        unset($bar2);
    }
}

$foo = new foo();
print $foo->getItem("bar2");
?>
$$ is only for use when you're doing a regular var. In other cases you 
just add a $.

For instance, when accessing a member var, you use:
$this->a;
To access a dynamic one you use:
$a = 'nameOfVar';
$this->$a;
For member fuctions:
$a = 'nameOfMemberFunction';
$this->$a();
For functions:
$a = 'nameOfFunction';
$a();
--
paperCrane <Justin Patrin>
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