Description:
------------
./configure --prefix=/opt/php 
--with-apxs2=/opt/apache/bin/apxs \ 
--with-mod_charset --disable-cgi --enable-magic-quotes 
--with-openssl \ 
--with-libxml-dir=/usr/lib --with-zlib --enable-bcmath 
--with-bz2 \ 
--enable-calendar --with-jpeg-dir=/usr/lib 
--with-tiff-dir=/usr/lib \ 
--with-curl --with-curlwrappers --with-db4 --with-cdb 
--with-inifile \ 
--with-flatfile --enable-dbase --enable-dbx --enable-dio 
--with-fam \ 
--enable-filepro --enable-ftp --with-gd 
--with-png-dir=/usr/lib \ 
--with-xpm-dir=/usr/lib --with-ttf 
--with-freetype-dir=/usr/lib \ 
--with-gettext --with-gmp --with-kerberos --with-ldap 
--with-ldap-sasl \ 
--enable-mbstring --with-mcrypt --with-mhash 
--with-mysql=/opt/mysql \ 
--with-mysqli=/opt/mysql/bin/mysql_config --with-ncurses 
--with-unixODBC \ 
--with-pgsql=/opt/postgresql --with-readline 
--enable-shmop --with-snmp \ 
--enable-ucd-snmp-hack --enable-soap --enable-sockets \ 
--enable-sqlite-utf8 --enable-sysvmsg --enable-sysvsem 
--enable-sysvshm \ 
--with-tidy=/usr --enable-wddx --with-xmlrpc --with-xsl 
--enable-yp \ 
--enable-maintainer-zts --enable-memory-limit 
--enable-zend-multibyte \ 
--with-tsrm-pthreads 

Reproduce code:
---------------
            $returnValue = @mcrypt_generic_init($this->encryptionDescriptor, $encryptionKey, $this->SetRandomIv());
            if (0 == intval($returnValue) && -3 !== $returnValue && -4 !== $returnValue) {
                throw new Exception("<h1>\n  Initialization Failed\n</h1>\n<strong>Fatal:</strong> mcrypt_generic_init(): An unknown error occurred : phpwebtk.cryptography.Crypt.Exception <strong>");
            } else if (-3 == $returnValue) {
                throw new Exception("<h1>\n  Initialization Failed\n</h1>\n<strong>Fatal:</strong> mcrypt_generic_init(): The key length was incorrect : phpwebtk.cryptography.Crypt.Exception <strong>");
            } else if (-4 == $returnValue) {
                throw new Exception("<h1>\n  Initialization Failed\n</h1>\n<strong>Fatal:</strong> mcrypt_generic_init(): There was a memory allocation problem : phpwebtk.cryptography.Crypt.Exception <strong>");
            } else {
                $ciphertext = mcrypt_generic($this->encryptionDescriptor, $plaintext);
                mcrypt_generic_deinit($this->encryptionDescriptor);
                $this->CloseModule();
            }

Expected result:
----------------
I expected the $returnValue to be a negative integer since 
I gave a bogus $this->encryptionDescriptor and according 
to the PHP manual, mcrypt_generic_init is supposed to 
return a negative integer on error. 

Actual result:
--------------
$returnValue was null despite the fact that 
$this->encryptionDescriptor was invalid. It showed the 
warning but I want to throw my own custom exception and 
use the @mcrypt_generic_init() syntax to hide the default 
warning. I cannot do that if a negative integer is not 
being returned upon an error.