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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

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Alisa Kasyanova
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Plesk Onyx for Linux kb: technical

Applicable to:

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

  1. Connect to the server via SSH;
  2. Restart the plesk-php-fpm service:

    # service plesk-php53-fpm restart

    Note: plesk-php53-fpm can be replaced with the required PHP version (e.g., plesk-php56-fpm, plesk-php71-fpm and etc.)

  3. If it does not help, re-install the PHP module mentioned in the error:

    # pecl uninstall apc
    # pecl install apc

Comments

2 comments

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  • Avatar
    Mark Oudsen

    This also works for other versions of PHP (php56 and php72 for example in my case on Centos 7). Just find out which services you have and restart each of them to fix the issue.

    #systemctl | grep fpm
    #systemctl restart plesk-php??-fpm.service

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  • Avatar
    Daria Gavrilova

    Hello @Mark Oudsen,

    Thank you for your input!

    The article was modified accordingly on this matter.

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