はじめに

Remi's RPM repositoryを利用してCentOS7にPHP5.6をインストール
親記事：PHP, PHP-FPMの各種インストール方法とEOLまとめ
参考：Remi's RPM repository

サポート

本手法で導入した場合、[PHP: Supported Versions] (https://www.php.net/supported-versions.php)/[PHP: Unsupported Branches](https://www.php.net/eol.php)より、2018-12-31がEOLになると思われる。
それ以降に報告された脆弱性や不具合への対応は実施されない可能性がある。
(メンテナーの御慈悲でその後もアップデートされているが、いつまで続くかはわからない)

note

インストール後の更新は yum --enablerepo=remi-php56 update

LOG

インストール

# cat /etc/redhat-release
CentOS Linux release 7.7.1908 (Core)

# yum install -y https://rpms.remirepo.net/enterprise/remi-release-7.rpm
... 略

# yum install -y --enablerepo=remi-php56 php which
... 略
=====================================================================

  WARNING : PHP 5.6 have reached its "End of Life" in
  January 2019. Even, if this package includes some of
  the important security fix, backported from 7.1, the
  UPGRADE to a maintained version is very strongly RECOMMENDED.

=====================================================================
... 略

各種確認

# which php
/usr/bin/php

# php -v
PHP 5.6.40 (cli) (built: Aug 28 2019 15:03:50)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

# php -i | grep php.ini
Configuration File (php.ini) Path => /etc
Loaded Configuration File => /etc/php.ini

# yum info php
Loaded plugins: fastestmirror, ovl
Loading mirror speeds from cached hostfile
 * base: ftp.iij.ad.jp
 * epel: ftp.riken.jp
 * extras: ftp.iij.ad.jp
 * remi-safe: ftp.riken.jp
 * updates: ftp.iij.ad.jp
Installed Packages
Name        : php
Arch        : x86_64
Version     : 5.6.40
Release     : 13.el7.remi
Size        : 8.5 M
Repo        : installed
From repo   : remi-php56
Summary     : PHP scripting language for creating dynamic web sites
URL         : http://www.php.net/
License     : PHP and Zend and BSD and MIT and ASL 1.0
Description : PHP is an HTML-embedded scripting language. PHP attempts to make it
            : easy for developers to write dynamically generated web pages. PHP also
            : offers built-in database integration for several commercial and
            : non-commercial database management systems, so writing a
            : database-enabled webpage with PHP is fairly simple. The most common
            : use of PHP coding is probably as a replacement for CGI scripts.
            :
            : The php package contains the module (often referred to as mod_php)
            : which adds support for the PHP language to Apache HTTP Server.

パッケージ更新状況

# rpm -q -changelog php | head -n 20
* Wed Aug 28 2019 Remi Collet <remi@remirepo.net> - 5.6.40-13
- mbstring:
  Fix CVE-2019-13224 don't allow different encodings for onig_new_deluxe
- pcre:
  Fix #75457 heap use-after-free in pcrelib

* Tue Jul 30 2019 Remi Collet <remi@remirepo.net> - 5.6.40-12
- exif:
  Fix #78256 heap-buffer-overflow on exif_process_user_comment
  CVE-2019-11042
  Fix #78222 heap-buffer-overflow on exif_scan_thumbnail
  CVE-2019-11041
- phar:
  Fix #77919 Potential UAF in Phar RSHUTDOWN

* Tue Jul 02 2019 Remi Collet <remi@remirepo.net> - 5.6.40-11
- use oracle client library version 19.3

* Tue May 28 2019 Remi Collet <remi@remirepo.net> - 5.6.40-9
- iconv: