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How to install PHP 5.3.X as secondary php version from source
PHPV=5.3.6
cd /usr/local/src
wget http://us.php.net/get/php-$PHPV.tar.gz/from/this/mirror
mv mirror php-$PHPV.tar.gz
tar xzvf php-$PHPV.tar.gz
chown -R $USER:$USER php-$PHPV/
cd php-$PHPV/
apt-get install libxml2-dev libssl-dev libcurl4-gnutls-dev libjpeg62-dev libpng12-dev libfreetype6-dev unixodbc-dev
./configure --prefix=/usr/local/php5.3 --with-config-file-path=/usr/local/etc/php5.3 --with-config-file-scan-dir=/usr/local/etc/php5.3/$SAPIconf.d --with-libdir=/lib --disable-cgi --with-libxml-dir=/usr/ --with-mysql=/usr/ --enable-pdo --with-pdo-mysql --with-mysqli --with-zlib-dir=/usr --with-curl --with-gd --with-jpeg-dir=/usr/lib --with-png-dir=/usr/lib --with-freetype-dir=/usr/lib --with-gettext --enable-mbstring --enable-soap --enable-ftp --enable-fpm --with-openssl
make
make test
make install
More help in case you have errors: PHP-Configure-und-Compile-Fehler