{"id":18990933,"date":"2026-08-11T20:04:05","date_gmt":"2026-08-11T20:04:05","guid":{"rendered":"https:\/\/wordpress.org\/support\/topic\/php-warning-unserialize-extra-data\/"},"modified":"2026-08-11T20:06:03","modified_gmt":"2026-08-11T20:06:03","slug":"php-warning-unserialize-extra-data","status":"publish","type":"topic","link":"https:\/\/wordpress.org\/support\/topic\/php-warning-unserialize-extra-data\/","title":{"rendered":"PHP Warning: unserialize(): Extra data"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Testing Challan as a potential PDF invoice generator for a client. When choosing &#8220;Download Invoice&#8221; on an order page:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>PHP message: PHP Warning:  unserialize(): Extra data starting at offset 121 of 124 bytes in \/wp-content\/uploads\/WOO-INVOICE\/mpdf\/vendor\/mpdf\/mpdf\/src\/Mpdf.php on line 9051\" while reading response header from upstream, request: \"GET \/wp-admin\/admin-ajax.php?action=wpifw_generate_invoice&amp;order_id=77210&amp;_wpnonce=foo HTTP\/2.0\", upstream: \"fastcgi:\/\/unix:\/var\/run\/php8.4-fpm.sock:\", referrer: \"\/wp-admin\/admin.php?page=wc-orders&amp;action=edit&amp;id=77210\"<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The invoice still generates, but I wanted you to be aware of this warning. Challan 3.7.85, PHP 8.4.23, WooCommerce 11.0.1, WordPress 7.0.3.<\/p>\n","protected":false},"template":"","class_list":["post-18990933","topic","type-topic","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/18990933","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":1,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/18990933\/revisions"}],"predecessor-version":[{"id":18990935,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/18990933\/revisions\/18990935"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=18990933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}