test case 1
Slackware x86_64 version 13.37.0

httpd-2.2.25 (modphp)
php version 5.3.8
[PHP Modules]
bcmath
Core
ctype
curl
date
dom
ereg
exif
fileinfo
filter
ftp
gd
gettext
hash
iconv
json
libxml
mbstring
mysql
mysqli
mysqlnd
openssl
pcre
PDO
pdo_sqlite
Phar
posix
Reflection
session
SimpleXML
soap
sockets
SPL
SQLite
sqlite3
standard
tokenizer
xml
xmlreader
xmlwriter
xsl
zlib


MySQL 5.5.19

zabbix-2.2.5 compiled from source (also tried 2.2.13)
./configure \
  --prefix=/usr/local \
  --sysconfdir=/etc/zabbix \
  --datadir=/etc \
  --localstatedir=/var/lib \
  --mandir=/usr/local/man \
  --libdir=/usr/local/lib64 \
  --enable-server \
  --with-mysql \
  --with-libcurl \
  --with-libxml2 \
  --with-net-snmp \
  --with-ldap



test case 2
Slackware x86_64 version 14.1 

httpd-2.4.18 (modphp)

php version 5.4.45
[PHP Modules]
Core
ctype
date
dom
ereg
filter
ftp
hash
iconv
json
libxml
pcre
posix
Reflection
session
SimpleXML
SPL
standard
sysvmsg
sysvsem
sysvshm
tokenizer
xml
xmlreader
xmlwriter

MySQL 5.5.46


zabbix 2.2.11 compiled from source (also tried 2.2.13)
SLKCFLAGS="-O2 -fPIC"
LIBDIRSUFFIX="64"

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr/local \
  --sysconfdir=/etc/zabbix \
  --datadir=/etc \
  --localstatedir=/var/lib \
  --mandir=/usr/local/man \
  --docdir=/usr/doc/$PRGNAM-$VERSION \
  --libdir=/usr/local/lib${LIBDIRSUFFIX} \
  --enable-server \
  --with-mysql \
  --with-libcurl \
  --with-libxml2 \
  --with-net-snmp \
  --with-ssh2 \
  --with-ldap \
  --enable-ipv6 \
  --build=$ARCH-slackware-linux

No additional zabbix modules/modifications.