Description:
------------
I Have a Interface class, One normal class,
if the normal class do not have all interfaces methods implements,
an i call class_exists('my_normal_class_extends_interface'),
the script is die, and no value is retorned.
If the normal class have all methods defined, then work fine.
Sorry for bad english.

Reproduce code:
---------------
Interface myInterface {
public funtion foo();
}
class normalClass implements myInterface{}
var_dump(class_exists('normalClass'));




Expected result:
----------------
i exptec php Reporting a fatal error, because the first 'normalClass',
no implements all methods in interface myInterface

Actual result:
--------------
Php die, when call class_exists