Для того, чтобы установить дополнительные модули  php для альтернативной версии php, необходимо в консоли прописать:

/opt/php56/bin/pecl install redis

Вместо redis, необходимо указывать модуль, который Вы хотите установить.

После того, как Вы пропишите данную команду, у Вас может появится ошибка:

[root@localhost ~]# /opt/php56/bin/pecl install redis
WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update
downloading redis-4.3.0.tgz ...
Starting to download redis-4.3.0.tgz (241,883 bytes)
..................................................done: 241,883 bytes
25 source files, building
running: phpize
Configuring for:
PHP Api Version:         20131106
Zend Module Api No:      20131226
Zend Extension Api No:   220131226
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.

ERROR: `phpize' failed

Если у Вас появилась такая ошибка, то пофиксить ее Вы можете установив дополнительные пакеты для сервера:

yum install autoconf gcc 

После их установки, снова прописываем команду:

/opt/php56/bin/pecl install redis

В результате, мы получаем такой вывод:

[root@localhost ~]# /opt/php56/bin/pecl install redis
WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update
downloading redis-4.3.0.tgz ...
Starting to download redis-4.3.0.tgz (241,883 bytes)
..................................................done: 241,883 bytes
25 source files, building
running: phpize
Configuring for:
PHP Api Version:         20131106
Zend Module Api No:      20131226
Zend Extension Api No:   220131226
enable igbinary serializer support? [no] : 
enable lzf compression support? [no] : 
building in /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0
running: /tmp/pear/temp/redis/configure --with-php-config=/opt/php56/bin/php-config --enable-redis-igbinary=no --enable-redis-lzf=no
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for a sed that does not truncate output... /usr/bin/sed
checking for cc... cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether cc accepts -g... yes
checking for cc option to accept ISO C89... none needed
checking how to run the C preprocessor... cc -E
checking for icc... no
checking for suncc... no
checking whether cc understands -c and -o together... yes
checking for system library directory... lib
checking if compiler supports -R... no
checking if compiler supports -Wl,-rpath,... yes
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking target system type... x86_64-unknown-linux-gnu
checking for PHP prefix... /opt/php56
checking for PHP includes... -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib
checking for PHP extension directory... /opt/php56/lib/php/modules
checking for PHP installed headers prefix... /opt/php56/include/php
checking if debug is enabled... no
checking if zts is enabled... no
checking for re2c... no
configure: WARNING: You will need re2c 0.13.4 or later if you want to regenerate PHP parsers.
checking for gawk... gawk
checking whether to enable redis support... yes, shared
checking whether to enable sessions... yes
checking whether to enable igbinary serializer support... no
checking whether to enable lzf compression... no
checking use system liblzf... no
checking for redis igbinary support... disabled
checking for git... no
checking for ld used by cc... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for /usr/bin/ld option to reload object files... -r
checking for BSD-compatible nm... /usr/bin/nm -B
checking whether ln -s works... yes
checking how to recognize dependent libraries... pass_all
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking dlfcn.h usability... yes
checking dlfcn.h presence... yes
checking for dlfcn.h... yes
checking the maximum length of command line arguments... 1572864
checking command to parse /usr/bin/nm -B output from cc object... ok
checking for objdir... .libs
checking for ar... ar
checking for ranlib... ranlib
checking for strip... strip
checking if cc supports -fno-rtti -fno-exceptions... no
checking for cc option to produce PIC... -fPIC
checking if cc PIC flag -fPIC works... yes
checking if cc static flag -static works... no
checking if cc supports -c -o file.o... yes
checking whether the cc linker (/usr/bin/ld -m elf_x86_64) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no

creating libtool
appending configuration tag "CXX" to libtool
configure: creating ./config.status
config.status: creating config.h
running: make
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=compile cc  -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /tmp/pear/temp/redis/redis.c -o redis.lo
mkdir .libs
 cc -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/redis/redis.c  -fPIC -DPIC -o .libs/redis.o
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=compile cc  -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /tmp/pear/temp/redis/redis_commands.c -o redis_commands.lo
 cc -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/redis/redis_commands.c  -fPIC -DPIC -o .libs/redis_commands.o
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=compile cc  -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /tmp/pear/temp/redis/library.c -o library.lo
 cc -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/redis/library.c  -fPIC -DPIC -o .libs/library.o
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=compile cc  -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /tmp/pear/temp/redis/redis_session.c -o redis_session.lo
 cc -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/redis/redis_session.c  -fPIC -DPIC -o .libs/redis_session.o
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=compile cc  -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /tmp/pear/temp/redis/redis_array.c -o redis_array.lo
 cc -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/redis/redis_array.c  -fPIC -DPIC -o .libs/redis_array.o
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=compile cc  -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /tmp/pear/temp/redis/redis_array_impl.c -o redis_array_impl.lo
 cc -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/redis/redis_array_impl.c  -fPIC -DPIC -o .libs/redis_array_impl.o
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=compile cc  -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /tmp/pear/temp/redis/redis_cluster.c -o redis_cluster.lo
 cc -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/redis/redis_cluster.c  -fPIC -DPIC -o .libs/redis_cluster.o
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=compile cc  -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /tmp/pear/temp/redis/cluster_library.c -o cluster_library.lo
 cc -I. -I/tmp/pear/temp/redis -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/redis/cluster_library.c  -fPIC -DPIC -o .libs/cluster_library.o
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=link cc -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/include -I/tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/main -I/tmp/pear/temp/redis -I/opt/php56/include/php -I/opt/php56/include/php/main -I/opt/php56/include/php/TSRM -I/opt/php56/include/php/Zend -I/opt/php56/include/php/ext -I/opt/php56/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -o redis.la -export-dynamic -avoid-version -prefer-pic -module -rpath /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/modules  redis.lo redis_commands.lo library.lo redis_session.lo redis_array.lo redis_array_impl.lo redis_cluster.lo cluster_library.lo
cc -shared  .libs/redis.o .libs/redis_commands.o .libs/library.o .libs/redis_session.o .libs/redis_array.o .libs/redis_array_impl.o .libs/redis_cluster.o .libs/cluster_library.o   -Wl,-soname -Wl,redis.so -o .libs/redis.so
creating redis.la
(cd .libs && rm -f redis.la && ln -s ../redis.la redis.la)
/bin/sh /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/libtool --mode=install cp ./redis.la /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/modules
cp ./.libs/redis.so /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/modules/redis.so
cp ./.libs/redis.lai /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/modules/redis.la
PATH="$PATH:/sbin" ldconfig -n /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/modules
----------------------------------------------------------------------
Libraries have been installed in:
   /tmp/pear/temp/pear-build-root8lDmxs/redis-4.3.0/modules

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,--rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------

Build complete.
Don't forget to run 'make test'.

running: make INSTALL_ROOT="/tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0" install
Installing shared extensions:     /tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0/opt/php56/lib/php/modules/
running: find "/tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0" | xargs ls -dils
394071    4 drwxr-xr-x 3 root root    4096 июн  7 15:38 /tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0
394107    4 drwxr-xr-x 3 root root    4096 июн  7 15:38 /tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0/opt
394108    4 drwxr-xr-x 3 root root    4096 июн  7 15:38 /tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0/opt/php56
394109    4 drwxr-xr-x 3 root root    4096 июн  7 15:38 /tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0/opt/php56/lib
394110    4 drwxr-xr-x 3 root root    4096 июн  7 15:38 /tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0/opt/php56/lib/php
394111    4 drwxr-xr-x 2 root root    4096 июн  7 15:38 /tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0/opt/php56/lib/php/modules
394106 2444 -rwxr-xr-x 1 root root 2502344 июн  7 15:38 /tmp/pear/temp/pear-build-root8lDmxs/install-redis-4.3.0/opt/php56/lib/php/modules/redis.so

Build process completed successfully
Installing '/opt/php56/lib/php/modules/redis.so'
install ok: channel://pecl.php.net/redis-4.3.0
configuration option "php_ini" is not set to php.ini location
You should add "extension=redis.so" to php.ini

После этого, мы заходим в /opt/php56/etc/php.ini и добавляем строку:

extension=redis.so

После этого, у нас появляется данный модуль в php. Проверить это можно с помощью команды: /opt/php56/bin/php -m

В данном примере мы устанавливать php модуль redis для php 5.6.