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If you installed Apache and PHP on your own, you’ll need to make sure that this package is installed for PHP to work:
libapache2-mod-php7.0
You’d replace 7.0 with the PHP version that corresponds to the version you’re wanting to install. This is the package that installs mod_php, which Apache needs to handle PHP requests.
I’d also recommend using the actual soap package that is available:
php7.0-soap
You can fetch a list of available packages by running:
apt-cache search php7.0
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