Upgraded Php From 5.3X To 5.6, Site Broken

I'm on CS-Cart 4.3.9. My host just upgraded PHP from 5.3x to 5.6 and I'm getting an internal server error (500) on both the backend and front end of the site. Anyone know how to fix this, or do I need to go back to 5.3?

Error log entries:

[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: eAccelerator: Unable to initialize module

Module compiled with module API=20090626
PHP compiled with module API=20131226
These options need to match
in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: suhosin: Unable to initialize module
Module compiled with module API=20090626
PHP compiled with module API=20131226
These options need to match
in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20090626/pdo.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20090626/pdo.so: undefined symbol: zval_property_ctor in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: pdo_sqlite: Unable to initialize module
Module compiled with module API=20090626
PHP compiled with module API=20131226
These options need to match
in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20090626/sqlite.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20090626/sqlite.so: undefined symbol: zval_property_ctor in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: pdo_mysql: Unable to initialize module
Module compiled with module API=20090626
PHP compiled with module API=20131226
These options need to match
in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20090626/imagick.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20090626/imagick.so: cannot open shared object file: No such file or directory in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: ffmpeg: Unable to initialize module
Module compiled with module API=20090626
PHP compiled with module API=20131226
These options need to match
in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Fatal error: Directive 'allow_call_time_pass_reference' is no longer available in PHP in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: eAccelerator: Unable to initialize module
Module compiled with module API=20090626
PHP compiled with module API=20131226
These options need to match
in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: suhosin: Unable to initialize module
Module compiled with module API=20090626
PHP compiled with module API=20131226
These options need to match
in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20090626/pdo.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20090626/pdo.so: undefined symbol: zval_property_ctor in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: pdo_sqlite: Unable to initialize module
Module compiled with module API=20090626
PHP compiled with module API=20131226
These options need to match
in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20090626/sqlite.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20090626/sqlite.so: undefined symbol: zval_property_ctor in Unknown on line 0
[26-Jul-2016 07:13:14 America/Chicago] PHP Warning: PHP Startup: pdo_mysql: Unable to initialize module
Module compiled with module API=20090626
PHP compiled with module API=20131226
These options need to match

Please address this issue to the hosting administrator. He should know how to fix it on the server side

I have, and they have. :-)

Thanks!