Install PHP 5.6 on CentOS 7
To install PHP 5.6 on CentOS 7, enable EPEL repo and remi repo
yum install epel-release -y rpm -ivh https://rpms.remirepo.net/enterprise/remi-release-7.rpm
Install yum-utils and enable remi-php56 repo
yum install yum-utils yum-config-manager --enable remi-php56
Install PHP 5.6 with
yum install -y php php-bcmath php-cli php-common php-devel php-gd \ php-imap php-intl php-json php-ldap php-lz4 php-mbstring php-mysqlnd \ php-soap php-intl php-opcache php-xml php-pdo