Fatal error: Uncaught Error: Call to undefined function ereg() in /wp-content/plugins/wpmathpub/phpmathpublisher/mathpublisher.php:1604 Stack trace: #0 /wp-content/plugins/wpmathpub/phpmathpublisher/mathpublisher.php(1625): detectimg('6567e0ff7f0ad18...') #1 /wp-content/plugins/wpmathpub/phpmathpublisher/mathpublisher.php(1661): mathimage('a_{11}x_{1}+a_{...', '12', 'http://blog.etr...') #2 /wp-content/plugins/wpmathpub/wpmathpub.php(110): mathfilter('<m>a_{11}x_{1}+...', '12', 'http://blog.etr...') #3 [internal function]: wpmathfilter(Array) #4 /wp-content/plugins/wpmathpub/wpmathpub.php(124): preg_replace_callback('#\\[pmath(\\s+siz...', 'wpmathfilter', 'W tym artykule ...') #5 /wp-includes/class-wp-hook.php(286): to_phpmath('W tym artykule ...') #6 /wp-includes/plugin.php(203): WP_Hook->apply_filters('W tym artykule ...', Array) #7 /wp-includes/formatting.php(3313): apply_filters('the_content', 'W tym artykule ...') #8 /wp-includes/class-wp-hook.php(288): wp_trim_excerpt('W tym artykule ...') #9 /wp-includes/plugin.php in /wp-content/plugins/wpmathpub/phpmathpublisher/mathpublisher.php on line 1604