PHP 5.5 on CentOS/RHEL 7.1, 6.7 and 5.11 via Yum

PHP 5.5.28 has been released on on 6th August 2015, and is also available for CentOS/RHEL 5.11, 6.7 and 7.1 at Webtatic via Yum.

PHP 5.5 adds new features such as:

  • Zend Optimizer+ opcode cache included, now known as opcache extension
  • Generators
  • try { } finally { }
  • Literal dereferencing for arrays and strings
  • Array return value de-referencing
  • Class name resolution
  • Password hashing API
  • and much more

To see what else has been added, check out the What has changed in PHP 5.5.x.

To install, first you must add the Webtatic EL yum repository information corresponding to your CentOS/RHEL version to yum:

CentOS/RHEL 7.x:

rpm -Uvh
rpm -Uvh

CentOS/RHEL 6.x:

rpm -Uvh

CentOS/RHEL 5.x:

rpm -Uvh

Now you can install PHP 5.5 (along with an opcode cache) by doing:

yum install php55w php55w-opcache

If you would like to upgrade php to this version it is recommended that you first check that your system will support the upgrade, e.g. making sure any CPanel-like software can run after the upgrade.

Unless you know what you are doing, it is risky upgrading an existing system. It’s much safer to do this by provisioning a separate server to perform the upgrade as a fresh install instead.

If you know what you are doing, you can upgrade PHP by:

yum install yum-plugin-replace
yum replace php-common --replace-with=php55w-common

It will likely give you a message “WARNING: Unable to resolve all providers …”. This is normal, and you can continue by tying “y“. You will be given a chance to see what packages will be installed and removed before again being given a chance to confirm.


php55w mod_php, php55w-zts
php55w-cli php-cgi, php-pcntl, php-readline
php55w-common php-api, php-bz2, php-calendar, php-ctype, php-curl, php-date, php-exif, php-fileinfo, php-ftp, php-gettext, php-gmp, php-hash, php-iconv, php-json, php-libxml, php-openssl, php-pcre, php-pecl-Fileinfo, php-pecl-phar, php-pecl-zip, php-reflection, php-session, php-shmop, php-simplexml, php-sockets, php-spl, php-tokenizer, php-zend-abi, php-zip, php-zlib
php55w-embedded php-embedded-devel
php55w-interbase php_database, php-firebird
php55w-mysql php-mysqli, php_database
php55w-mysqlnd php-mysqli, php_database
php55w-odbc php-pdo_odbc, php_database
php55w-opcache php55w-pecl-zendopcache
php55w-pgsql php-pdo_pgsql, php_database
php55w-process php-posix, php-sysvmsg, php-sysvsem, php-sysvshm
php55w-xml php-dom, php-domxml, php-wddx, php-xsl

Opcode Caches

The PHP distribution now comes with an opcode cache. This is the Zend Optimizer+ opcode cache, now known as the Zend OPcache extension. This extension is optional, so does not preclude you from using an alternate one. APC has been less maintained in recent years, so not as suitable (however it did also have a very convenient in-process user-cache which will be missed).

Due to it being included in the PHP source distribution, it will be well maintained and more suitable for use while other Opcode cache’s are being updated over the coming months.

yum install php55w-opcache

Webtatic will investigate the stability of APC for PHP 5.5, but cannot guarantee it stable enough to be included in the Yum repository.

error_reporting E_ALL now includes E_STRICT

As mentioned in the PHP 5.4 guide:

You may get a lot more errors coming out of your error logs if by default your error_reporting is set to E_ALL now without explicitly turning off E_STRICT. The default php.ini that comes with the PHP package turns this off by default, but if you are upgrading from an existing installation, your php.ini may not be updated, meaning this will likely be turned on.


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