Description:
------------
Extensions cannot have uppercase characters in their names. extension_loaded return true, get_extension_functions return declared functions but using functions return undeclared function error and function_exists return false.

If extension name is only lowercase, everything will work fine (eg. "myOwnExtension" named as "myownextension" or "my_own_extension").

Reproduce code:
---------------
<?php
$ext = "myOwnExtension";
echo "{$ext} test\n\n";
echo "{$ext} is loaded: " . var_export(extension_loaded($ext), TRUE) . "\n\n";
echo "Extension functions:\n\n";
$funcs = get_extension_funcs($ext);
foreach ($funcs as $f) {
   echo "{$f} " . var_export(function_exists($f), TRUE) . "\n";
}

Expected result:
----------------
MyOwnExtension test

MyOwnExtension is loaded: true

Extension functions:

MyOwnFunction true

Actual result:
--------------
MyOwnExtension test

MyOwnExtension is loaded: true

Extension functions:

MyOwnFunction false