Delete Symbolic Link
rm /usr/pbi/squid-amd64/bin/check_ip.php

attached file change name to check_ip.php and upload /root directory. After upload move file to /usr/pbi/squid-amd64/bin/
mv /root/check_ip.php /usr/pbi/squid-amd64/bin/

the need to create symbolic links
ln -s /usr/local/bin/php /usr/pbi/squid-amd64/local/bin/php
ln -s /usr/local/lib/php /usr/pbi/squid-amd64/local/lib/php
ln -s /usr/local/etc/php.ini /usr/pbi/squid-amd64/local/etc/php.ini
ln -s /usr/local/lib/libsqlite3.so.0 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libcurl.so.4 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libintl.so.8 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libldap-2.4.so.2 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libmcrypt.so.4 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libonig.so.1 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libzmq.so.5 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libssh2.so.1 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/ipsec/libvici.so.0 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/liblber-2.4.so.2 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libltdl.so.7 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libsodium.so.13 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libpgm-5.2.so.0 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/ipsec/libstrongswan.so.0 /usr/pbi/squid-amd64/local/lib/
ln -s /usr/local/lib/libvstr-1.0.so.0 /usr/pbi/squid-amd64/local/lib/

that is all
check_ip.php.txt