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PHP error: Unable to load dynamic library '/usr/lib64/php/modules/apc.so' undefined symbol: zend_new_interned_string in Unknown on line 0

Alisa Kasyanova

Updated May 17, 2018 00:18

Applicable to:

Plesk 10.x for Linux
Plesk Onyx for Linux
Plesk 11.x for Linux

Symptoms

PHP fails with a similar warning:

# php -v
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/apc.so' - /usr/lib64/php/modules/apc.so: undefined symbol: zend_new_interned_string in Unknown on line 0 
PHP 5.3.3 (cli) (built: Dec 11 2013 03:29:57) Copyright (c) 1997-2010 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies

Cause

PHP module got corrupted after the PHP re-installation\upgrade.

Resolution

Connect to the server via SSH;
Restart the plesk-php-fpm service:
# service plesk-php53-fpm restart
If it does not help, re-install the PHP module mentioned in the error:
# pecl uninstall apc
# pecl install apc

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