According to the manual, assert() accepts string or boolean. However, it seems assert() does handle string type well, especially if it's a class property. (Parse error) Either PHP or the manual page is wrong.

Following code does not work well.

== code #1 ==
<?php
class A 
{
	var $name = 'class A';

	function print_name() 
	{
		assert($this->name);
		print $this->name;
	}
	
}
$obj1 = new A;
$obj1->print_name();
?>== result #1 ==
Parse error: parse error in /home/yohgaki/public_html/test/bug/obj_property/test.php(7) : assert code on line 1

Fatal error: Failure evaluating code: class A in /home/yohgaki/public_html/test/bug/obj_property/test.php on line 7

== code #2 ==
<?php 
$str1 = '';
$str2 = 'abc';

assert($str1);
assert($str2);
?>
== result #2 ==Warning: Assertion "" failed in /home/yohgaki/public_html/test/bug/obj_property/test2.php on line 5

Warning: Use of undefined constant abc - assumed 'abc' in /home/yohgaki/public_html/test/bug/obj_property/test2.php(6) : assert code on line 1

== code #3 ==
<?php 
$arr = array('abc');

assert($arr['abc']);
?>
== result #3 ==
Warning: Undefined index: abc in /home/yohgaki/public_html/test/bug/obj_property/test3.php on line 4

Warning: Assertion failed in /home/yohgaki/public_html/test/bug/obj_property/test3.php on line 4