check the php version in ubuntu
php --version
cambiar entre versiones de php linux
$ sudo a2dismod php7.2 //Deshabilitamos version corriendo
$ sudo a2enmod php7.0 //Habilitamos version a esoger
$ sudo service apache2 restart //Damos reset a apache2
$ sudo update-alternatives --set php /usr/bin/php7.0 //Seleccionamos la libreria de php
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