Fix CallAnyFunction.php error_reporting E_ALL

before:
--
```bash
% php CallAnyFunction.php
PHP Warning:  strlen() expects parameter 1 to be string, object given in /var/www/scalr/app/www/pthreads/examples/CallAnyFunction.php on line 60

Warning: strlen() expects parameter 1 to be string, object given in /var/www/scalr/app/www/pthreads/examples/CallAnyFunction.php on line 60
Got 0 bytes from php.net
PHP Warning:  substr() expects parameter 1 to be string, object given in /var/www/scalr/app/www/pthreads/examples/CallAnyFunction.php on line 62

Warning: substr() expects parameter 1 to be string, object given in /var/www/scalr/app/www/pthreads/examples/CallAnyFunction.php on line 62
First 16 chars:
```
after:
--
```bash
% php CallAnyFunction.php
Got 53641 bytes from php.net
First 16 chars: <!DOCTYPE html P
```