{"id":19053461,"date":"2026-10-23T23:32:37","date_gmt":"2026-10-23T23:32:37","guid":{"rendered":"https:\/\/wordpress.org\/support\/topic\/php-8-3-36-causes-error-apparently-elementor-error\/"},"modified":"2026-10-23T23:32:37","modified_gmt":"2026-10-23T23:32:37","slug":"php-8-3-36-causes-error-apparently-elementor-error","status":"publish","type":"topic","link":"https:\/\/wordpress.org\/support\/topic\/php-8-3-36-causes-error-apparently-elementor-error\/","title":{"rendered":"PHP 8.3.36 causes error, apparently Elementor error"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Everything worked with PHP 8.3.33. When I switch to 8.3.36 (the security update) the same page gives this error:<br><br>PHP Fatal error: Uncaught Error: Call to undefined function Elementor\\mb_strtolower() in C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\includes\\utils.php:724 Stack trace: #0 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor-pro\\modules\\custom-attributes\\module.php(134): Elementor\\Utils::parse_custom_attributes() #1 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\class-wp-hook.php(353): ElementorPro\\Modules\\CustomAttributes\\Module-&gt;render_attributes() #2 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\class-wp-hook.php(377): WP_Hook-&gt;apply_filters() #3 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\plugin.php(523): WP_Hook-&gt;do_action() #4 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\includes\\base\\element-base.php(856): do_action() #5 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\includes\\base\\widget-base.php(501): Elementor\\Element_Base-&gt;add_render_attributes() #6 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\includes\\base\\element-base.php(547): Elementor\\Widget_Base-&gt;add_render_attributes() #7 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\includes\\base\\element-base.php(1484): Elementor\\Element_Base-&gt;print_element() #8 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\includes\\base\\element-base.php(522): Elementor\\Element_Base-&gt;print_content() #9 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\core\\base\\document.php(1946): Elementor\\Element_Base-&gt;print_element() #10 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\core\\base\\document.php(1839): Elementor\\Core\\Base\\Document-&gt;do_print_elements() #11 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\core\\base\\document.php(1236): Elementor\\Core\\Base\\Document-&gt;print_elements() #12 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\includes\\frontend.php(1223): Elementor\\Core\\Base\\Document-&gt;print_elements_with_wrapper() #13 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\includes\\frontend.php(1105): Elementor\\Frontend-&gt;get_builder_content() #14 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\class-wp-hook.php(353): Elementor\\Frontend-&gt;apply_builder_in_content() #15 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\plugin.php(206): WP_Hook-&gt;apply_filters() #16 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\post-template.php(256): apply_filters() #17 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\themes\\hello-elementor\\template-parts\\single.php(24): the_content() #18 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\template.php(882): require(&#8216;&#8230;&#8217;) #19 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\template.php(815): load_template() #20 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\general-template.php(206): locate_template() #21 C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\themes\\hello-elementor\\index.php(20): get_template_part() #22 C:\\home\\insightandenergy.com\\wwwroot\\wp-includes\\template-loader.php(132): include(&#8216;&#8230;&#8217;) #23 C:\\home\\insightandenergy.com\\wwwroot\\wp-blog-header.php(19): require_once(&#8216;&#8230;&#8217;) #24 C:\\home\\insightandenergy.com\\wwwroot\\index.php(17): require(&#8216;&#8230;&#8217;) #25 {main} thrown in C:\\home\\insightandenergy.com\\wwwroot\\wp-content\\plugins\\elementor\\includes\\utils.php on line 724<\/p>\n","protected":false},"template":"","class_list":["post-19053461","topic","type-topic","status-publish","hentry","topic-tag-crash"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/19053461","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic"}],"about":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/19053461\/revisions"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=19053461"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}