Title: PHP Strict Standards
Last modified: August 30, 2016

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# PHP Strict Standards

 *  Resolved [philsalt](https://wordpress.org/support/users/philsalt/)
 * (@philsalt)
 * [10 years, 8 months ago](https://wordpress.org/support/topic/php-strict-standards-7/)
 * Hi Bas,
 * Noticed this in the php5.6 error log after re-activating plugin after WordPress
   4.4 update:
 * “[10-Dec-2015 22:23:50 UTC] PHP Strict Standards: call_user_func_array() expects
   parameter 1 to be a valid callback, non-static method BE_WooCommerce_PDF_Invoices_Premium::
   plugin_activation() should not be called statically in /srv/users/serverpilot/
   apps/shop/public/wp-includes/plugin.php on line 525”
 * Be well,
    Phil
 * [https://wordpress.org/plugins/woocommerce-pdf-invoices/](https://wordpress.org/plugins/woocommerce-pdf-invoices/)

Viewing 1 replies (of 1 total)

 *  Plugin Author [Bas Elbers](https://wordpress.org/support/users/baaaaas/)
 * (@baaaaas)
 * [10 years, 7 months ago](https://wordpress.org/support/topic/php-strict-standards-7/#post-6838560)
 * Hi Phil,
    I’ve fixed this error with the new update. Thanks for letting me know!
   🙂 Would you be so kind to [rate](https://wordpress.org/support/view/plugin-reviews/woocommerce-pdf-invoices?rate=5#postform)
   the plugin? It will support future development big-time! 🙂

Viewing 1 replies (of 1 total)

The topic ‘PHP Strict Standards’ is closed to new replies.

 * ![](https://ps.w.org/woocommerce-pdf-invoices/assets/icon-128x128.png?rev=1128583)
 * [Invoices for WooCommerce](https://wordpress.org/plugins/woocommerce-pdf-invoices/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/woocommerce-pdf-invoices/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/woocommerce-pdf-invoices/)
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 * 1 reply
 * 2 participants
 * Last reply from: [Bas Elbers](https://wordpress.org/support/users/baaaaas/)
 * Last activity: [10 years, 7 months ago](https://wordpress.org/support/topic/php-strict-standards-7/#post-6838560)
 * Status: resolved