[PHP-DEV] PHP 4.0 Bug #3175: function_exists() only works for non-class member functions From: apresence <email protected>
Date: 01/11/00

From: apresence <email protected>
Operating system: Debian Linux 2.0.36
PHP version: 4.0 Beta 2
PHP Bug Type: Misbehaving function
Bug description: function_exists() only works for non-class member functions

Replace spam in my e-mail addy with .com (spam guard).

I heard a nasty rumor that function_exists() should return true for class names, but it doesn't do that either.

Suggestion: Provide a new function called class_function_exists() which when passed a class name (or maybe an instance of a class, but a class name seems to make more sense), and a function name defined only in that class, returns TRUE, otherwise FALSE. This would behave differently than function_exists(), even if it did work for class function names, in that it would return FALSE for functions not declared in global scope (See *A* below).

Example code:

<?php
  class Foo {
    function test() {
      return;
    }

    function function_exists($name) {
      return function_exists($name);
    }
  }
  
  function bar() {
    return;
  }
  
  function Baz() {
    return;
  }
  
  function showbool($bool) {
    echo ($bool ? "TRUE" : "FALSE") . "<BR>\n";
  }

  echo "<HTML><BODY>\n";

  // First, test functionality outside of a class
  showbool(function_exists('bar')); // TRUE (works)
  showbool(function_exists('Baz')); // TRUE (works, a comment on the documentation page said it didn't)
  showbool(function_exists('baz')); // TRUE (works, makes sense because function names are insensitive in PHP)
  showbool(function_exists('Foo')); // FALSE (doesn't work)
  showbool(function_exists('Foo->test')); // FALSE (doesn't work)

  // Now, test functionality inside of a class
  $foo = new Foo();
  showbool($foo->function_exists('bar')); // TRUE (This makes sense because bar is a function declared in global scope, even though it is outside of the class)
  showbool($foo->function_exists('Foo')); // FALSE (didn't work, didn't expect it to, but tried it anyway)
  showbool($foo->function_exists('Foo->test')); // FALSE (didn't work, didn't expect it to, but tried it anyway)
  showbool($foo->function_exists('test')); // FALSE (seems like this should return TRUE)

  echo "</BODY></HTML>\n";
?> 

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