Title: PHP Fatal error: undefined function igbinary_unserialize()
Last modified: April 26, 2019

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# PHP Fatal error: undefined function igbinary_unserialize()

 *  Resolved [bruce-s](https://wordpress.org/support/users/3ruce/)
 * (@3ruce)
 * [7 years, 1 month ago](https://wordpress.org/support/topic/php-fatal-error-undefined-function-igbinary_unserialize/)
 * I upgraded a debian 9 machine from php 7.0 to php 7.1 and now I get the following
   error when running wp plugin update –all or similar via wp-cli
 * \`
    PHP Fatal error: Uncaught Error: Call to undefined function igbinary_unserialize()
   in /home/admin/web/public_html/wp-content/object-cache.php:1123 Stack trace: #
   0 /home/admin/web/public_html/wp-content/object-cache.php(740): WP_Object_Cache-
   >maybe_unserialize(‘\x00\x00\x00\x02\x05’) #1 /home/admin/web/public_html/wp-
   content/object-cache.php(128): WP_Object_Cache->get(‘is_blog_install…’, ”, false,
   true) #2 /home/admin/web/public_html/wp-includes/functions.php(1524): wp_cache_get(‘
   is_blog_install…’) #3 /home/admin/web/public_html/wp-includes/load.php(615): 
   is_blog_installed() #4 /home/admin/web/public_html/wp-settings.php(144): wp_not_installed()#
   5 phar:///usr/local/bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.php(1209): 
   require(‘/home/admin/web…’) #6 phar:///usr/local/bin/wp/vendor/wp-cli/wp-cli/
   php/WP_CLI/Runner.php(1130): WP_CLI\Runner->load_wordpress() #7 phar:/ in /home/
   admin/web/public_html/wp-content/object-cache.php on line 1123 `
 * If I rename `object-cache.php` to `object-cache.php.bak` then wp-cli works fine
   again…
 * php-redis is version 3.1.1-1 and wp-cli is version 2.2.0
 * Do you guys have any suggestions? Thanks!

Viewing 1 replies (of 1 total)

 *  Plugin Author [Till Krüss](https://wordpress.org/support/users/tillkruess/)
 * (@tillkruess)
 * [7 years, 1 month ago](https://wordpress.org/support/topic/php-fatal-error-undefined-function-igbinary_unserialize/#post-11473502)
 * Don’t use the IGbinary or install it.

Viewing 1 replies (of 1 total)

The topic ‘PHP Fatal error: undefined function igbinary_unserialize()’ is closed
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## Tags

 * [object-cache](https://wordpress.org/support/topic-tag/object-cache/)
 * [wp-cli](https://wordpress.org/support/topic-tag/wp-cli/)

 * 1 reply
 * 2 participants
 * Last reply from: [Till Krüss](https://wordpress.org/support/users/tillkruess/)
 * Last activity: [7 years, 1 month ago](https://wordpress.org/support/topic/php-fatal-error-undefined-function-igbinary_unserialize/#post-11473502)
 * Status: resolved