Call to undefined method: snake_case vs camelCase engines

Symptom: page ends mid-table

A freshly migrated section page returned HTTP 200 with 8 kilobytes of body and no footer. The content test failed the same way: marker id="bottomid" not found. The log named file and line outright:

PHP Fatal error: Uncaught Error: Call to undefined method Aredel\Ru\Php\Page::get_ads_block()

A fatal mid-page looks like a missing footer. It is not — the footer never runs because the request dies first.

Root cause: wrong method dialect

The page body was copied from the old tree, where the engine spoke snake_case (create_head(), get_ads_block()). The new engine speaks camelCase (createHead(), getAdsBlock()). The header and footer calls were converted during migration; one mid-body ad call was not — and a single missed call is enough to kill the whole page.

Fix: match the engine API

One line:

$page->get_ads_block() → $page->getAdsBlock()

Then re-scan the migrated tree for the old dialect. The same class of miss hides in every copied body:

grep -rn "create_head()\|create_footer()\|get_ads_block()\|is_mobile()" container/src/ru/latex/

Zero hits is the acceptance check — alongside the footer marker on every migrated URL.

Guard: one engine per tree

The deeper lesson repeats the redeclare case: each tree must use only its own engine files. A page that boots one engine but calls another dialect dies the same silent death — output stops mid-page, status stays 200, only the log tells the truth.

Article author: Arthur Isaev