PHP function overloading

Question

Coming from C++ background ;)
How can I overload PHP functions?

One function definition if there are any arguments, and another if there are no arguments? Is it

Answer 1

To over load a function simply do pass parameter as null by default,

class ParentClass
{
   function mymethod($arg1 = null, $arg2 = null, $arg3 = null)  
     {  
        if( $arg1 == null && $arg2 == null && $arg3 == null ){ 
           return 'function has got zero parameters 
';
        }
        else
        {
           $str = '';
           if( $arg1 != null ) 
              $str .= "arg1 = ".$arg1." 
";

           if( $arg2 != null ) 
              $str .= "arg2 = ".$arg2." 
";

           if( $arg3 != null ) 
              $str .= "arg3 = ".$arg3." 
";

           return $str;
         }
     }
}

// and call it in order given below ...

 $obj = new ParentClass;

 echo '
$obj->mymethod()
';
 echo $obj->mymethod();

 echo '
$obj->mymethod(null,"test") 
';
 echo $obj->mymethod(null,'test');

 echo '
 $obj->mymethod("test","test","test")
';
 echo $obj->mymethod('test','test','test');