Installing and switching different versions of PHP is important because different applications and websites require different versions of PHP to function properly. For example, an older website may require an older version of PHP to work, while a newer application may require a newer version of PHP. In addition, some developers may prefer to work with a specific version of PHP for their projects. Being able to switch between different versions of PHP allows developers to work with the version that is best suited for their project.
1. Run the below command to install PPA and enable the PHP repository.
root@ubuntu ~]# apt update ; apt install software-properties-common -y ; add-apt-repository ppa:ondrej/php
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