Use/install php extension for Linux fails

I am getting grey hairs trying to use the chilkat.so php extension. It must be an error on my end, but I just can't find what I am doing wrong here.

I did extract ALL (I know dont need all there) files from chilkat-9.5.0-php-5.5-x86-linux.tar an placed them into my "/web/chil" folder, which I can access via http.

showExtDir.php shows this: /usr/local/apache/modules So I placed the chilkat_9_5_0.so in there via SFTP-Access.

I did look into the phpinfo.php and got the following results for my QNAP-NAS Device:

> PHP Version 5.5.31 Build Date  Mar 11
> 2016 04:33:33   Configure Command 
> './configure' '--disable-debug'
> '--prefix=/root/daily_build/4.2.0/Model/TS-459/../../NasMgmt/HTTP/php5'
> '--with-config-file-path=/etc/config/php.ini' '--with-config-file-scan-dir=/etc/config/php.d'
> '--enable-ftp=shared'
> '--enable-sockets=shared'
> '--with-gettext=shared'
> '--with-zlib=shared'
> '--with-jpeg-dir='
> '--with-png-dir=/opt/cross-project/x86/sys-root/usr'
> '--with-gd=shared'
> '--with-freetype-dir=/opt/cross-project/x86/sys-root/usr'
> '--enable-gd-native-ttf=shared'
> '--enable-mbstring=shared'
> '--with-openssl=shared,/opt/cross-project/x86/sys-root/usr'
> '--with-libxml-dir=/opt/cross-project/x86/sys-root/usr'
> '--enable-libxml=shared,/opt/cross-project/x86/sys-root/usr'
> '--enable-sqlite-utf8=shared'
> '--with-mysql=shared,mysqlnd'
> '--with-mcrypt=shared,/opt/cross-project/x86/sys-root/usr'
> '--enable-zend-multibyte=shared'
> '--with-iconv=shared,/opt/cross-project/x86/sys-root/usr'
> '--enable-exif=shared'
> '--with-pdo-mysql=shared,mysqlnd'
> '--enable-pdo=shared'
> '--with-pdo-sqlite=shared,/opt/cross-project/x86/sys-root/usr'
> '--with-sqlite=shared'
> '--with-curl=shared,/root/daily_build/4.2.0/Model/TS-459/../../SysUtil/curl-7.43.0'
> '--with-curlwrappers=shared,/root/daily_build/4.2.0/Model/TS-459/../../SysUtil/curl-7.43.0'
> '--with-xsl=shared,/opt/cross-project/x86/sys-root/usr'
> '--with-mysqli=shared,mysqlnd'
> '--enable-calendar=shared'
> '--enable-bcmath=shared'
> '--with-ldap=shared,/opt/cross-project/x86/sys-root/usr'
> '--with-imap=shared,/opt/cross-project/x86/sys-root/usr'
> '--with-imap-ssl=/opt/cross-project/x86/sys-root/usr'
> '--enable-dba=shared'
> '--enable-dbase=shared'
> '--enable-shmop=shared'
> '--enable-wddx=shared'
> '--enable-zip=shared'
> '--with-xmlrpc=shared'
> '--enable-soap=shared'
> '--with-mssql=shared,/root/daily_build/4.2.0/Model/TS-459/../../NasMgmt/HTTP/php_modules/php_mod_install/i386'
> '--enable-pcntl=shared'
> '--enable-mysqlnd=shared'
> '--enable-session=shared'
> '--with-sqlite3=shared' '--enable-fpm'
> '--with-fpm-user=httpdusr'
> '--with-fpm-group=administrators'  
> Server API  FPM/FastCGI   Virtual
> Directory Support  disabled  
> Configuration File (php.ini) Path 
> /etc/config/php.ini   Loaded
> Configuration File 
> /mnt/HDA_ROOT/.config/php.

That is why I did add under "/mnt/HDA_ROOT/.config/php.ini" the following in the [PHP]-Section:

[PHP]

extension = chilkat_9_5_0.so
extension_dir = /usr/local/apache/modules

Accessing the standard file "test.php" I only get HTTP 500 error via IE and an empty page via Firefox. I am able to place a echo "Hello" BEFORE $crypt = new CkCrypt2() and It show sup on screen. But nothing AFTER this call. I am asking for your help :( I got 2 different Accounts with Serials (one with still 1 year support!) here.

<?php

include("chilkat_9_5_0.php");

echo "hello";

$crypt = new CkCrypt2();