Question

I am within a class. I try to set an object member:

$this->list = "hello";
print $this->list;

It returns “hello”;

However, empty($this->list)) always return true.

But for non object member $tmp = "hello", empty($tmp) return false.

Why empty() cannot be used on object member?

Update:
empty() is influenced by the the my code framework. That is why it does not work properly.

Answer 1

<?php

  class Foo
  {
    var $bar;

    function Bar()
    {
      $this->bar = 'hello';
      echo "In class: " . (empty($this->bar) ? 'empty' : 'populated') . "\r\n";
    }
  }

  $foo = new Foo();
  $foo->Bar();

  echo "Out of class: " . (empty($foo->bar) ? 'empty' : 'populated');

Output:

In class: populated
Out of class: populated

Not sure what you mean. Maybe provide more code? Also, per the empty() manual, the following values are to be considered empty:

• “” (an empty string)
• 0 (0 as an integer)
• 0.0 (0 as a float)
  9 “0” (0 as a string)
• NULL
• FALSE
• array() (an empty array)
• var $var; (a variable declared, but without a value in a class)

Also, try using var_dump on the object to confirm it’s what you’re expecting.