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('fc836e0f519852b...') #1 /wp-content/plugins/wpmathpub/phpmathpublisher/mathpublisher.php(1661): mathimage('f(x)', '12', 'http://blog.etr...') #2 /wp-content/plugins/wpmathpub/wpmathpub.php(110): mathfilter('<m>f(x)</m>', '12', 'http://blog.etr...') #3 [internal function]: wpmathfilter(Array) #4 /wp-content/plugins/wpmathpub/wpmathpub.php(124): preg_replace_callback('#\\[pmath(\\s+siz...', 'wpmathfilter', '<h2 style="text...') #5 /wp-includes/class-wp-hook.php(286): to_phpmath('<h2 style="text...') #6 /wp-includes/plugin.php(203): WP_Hook->apply_filters('<h2 style="text...', Array) #7 /wp-includes/formatting.php(3313): apply_filters('the_content', '<h2 style="text...') #8 /wp-includes/class-wp-hook.php(288): wp_trim_excerpt('<h2 style="text...') #9 /wp-includes/plugin.php(203): WP_Hook->apply in /wp-content/plugins/wpmathpub/phpmathpublisher/mathpublisher.php on line 1604