Women in Technology

Article:		Object Overloading in PHP 5
Subject:		method overloading ala C++/Java
Date:		2005-07-15 03:47:50
From:		simoncpu
Is there a straightforward way to overload methods having the same name but with different number of parameters? Can you please share a technique to do that? Thanks. [ simon.cpu]

Showing messages 1 through 2 of 2.

• method overloading ala C++/Java
  2005-07-17 13:56:25  MartinJansen [View]
  
  
  PHP 5 does not support polymorphism as you know it from Java or C++, but you can sort of emulate it.
  
  
function foo($arg1, $arg2 = null) {
if (!isset($arg2)) {
$arg2 = 42;
}

return $arg1 + $arg2;
}

  
  is "equivalent" to the following Java code:
  
  
public int foo(int arg1, int arg2) {
return arg1 + arg2;
}

public int foo(int arg1) {
return foo(arg1, 42);
}

  
  In a similar manner you can support homonymous methods with different parameter types:
  
  
function foo($arg1) {
if (!is_array($arg1)) {
$arg1 = array($arg1);
}

/* ... */
}

  
  is "equivalent" to the following Java (pseudo-)code:
  
  
public void foo(HashTable arg1) {
/* ... */
}

public void foo(int arg1) {
HashTable a = new HashTable;
a.push(arg1);
foo(a);
}

• method overloading ala C++/Java
  2005-10-04 08:08:40  trollll [View]
  
  
  instead of:
  function foo($arg1, $arg2 = null) {
if (!isset($arg2)) {
$arg2 = 42;
}


return $arg1 + $arg2;
}
  why not just say:
  function foo($arg1, $arg2 = 42) {
return $arg1 + $arg2;
}
  other than that, glad to see someone else misses polymorphism. i wish i had the time to add it myself... i haven't checked the game plan on future releases lately - anyone know when and if i can start looking forward to this?