PHP error: php_network_getaddresses: getaddrinfo failed: (while getting information from other site.)

It's because you can't resolve the host name Maybe DNS problems, host is unreachable...

try to use IP address instead of host name... ping this host name... nslookup it...

In the following httpd.conf file, configure the ServerName properly.

/etc/httpd/conf/httpd.conf

Like below:

ServerName 127.0.0.1:80

ServerName sitename

This resolved similar issue I was facing.

In my case(my machine is ubuntu 16), I append /etc/resolvconf/resolv.conf.d/base file by adding below ns lines.

nameserver 8.8.8.8
nameserver 4.2.2.1
nameserver 2001:4860:4860::8844
nameserver 2001:4860:4860::8888

then run the update script,

resolvconf -u

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