PHP, Ruby & Other Languages

PHP and Ruby still power a huge share of the web. Errors here cluster around dynamic typing pitfalls (undefined keys, nil methods), session and state handling, and version/dependency mismatches (Bundler, Composer).

Recommended starting points:

• PHP undefined array key — the most common PHP 8 surprise.
• Ruby NoMethodError — the universal Ruby bug.

All articles (11)

• Fix: Inertia.js Not Working — Shared Data, Lazy Props, Versioning, Forms, and SSR

  How to fix Inertia.js errors — Inertia.render not returning a component, shared data missing on every page, lazy props not deferring, asset versioning forcing reloads, useForm helper, and SSR setup.

• Fix: Laravel Queue Job Not Processing — Jobs Stuck in Queue

  How to fix Laravel queue jobs not running — queue worker not started, wrong connection config, failed jobs, job timeouts, horizon setup, and database vs Redis queue differences.

• Fix: PHP Session Not Working — $_SESSION Variables Lost Between Requests

  How to fix PHP session variables that don't persist between requests — session_start() placement, cookie settings, session storage, shared hosting, and session fixation security.

• Fix: Rails N+1 Query Problem — Too Many Database Queries

  How to fix Rails N+1 queries — includes vs joins vs preload vs eager_load, Bullet gem detection, avoiding N+1 in serializers and views, and counter caches.

• Fix: Ruby Bundler Version Conflict — Gemfile Requirements Could Not Be Resolved

  How to fix Ruby Bundler gem version conflicts — Gemfile.lock resolution, platform-specific gems, bundle update strategies, conflicting transitive dependencies, and Bundler version issues.

• Fix: PHP Warning: Undefined array key (Undefined index)

  Fix the PHP warning Undefined array key, Undefined index, and Trying to access array offset on null by checking keys, using the null coalescing operator, and handling PHP 8 strictness.

• Fix: PHP Fatal error: Allowed memory size of X bytes exhausted

  How to fix PHP Fatal error Allowed memory size exhausted caused by memory limits, large datasets, memory leaks, recursive functions, and inefficient queries.

• Fix: Ruby NoMethodError: undefined method for nil:NilClass

  How to fix Ruby NoMethodError undefined method for nil NilClass caused by uninitialized variables, missing return values, wrong hash keys, and nil propagation.

• Fix: Ruby LoadError - cannot load such file

  Resolve Ruby's LoadError by checking gem installation, fixing load paths, verifying Bundler setup, and ensuring correct require statements.

• Fix: Composer Allowed Memory Size Exhausted – PHP Fatal Error

  How to fix the PHP Composer error 'Allowed memory size exhausted' by increasing memory limits, optimizing dependencies, or using memory_limit flags.

• Fix: Nginx 502 Bad Gateway

  How to fix Nginx 502 Bad Gateway errors caused by upstream server issues, wrong proxy_pass configuration, PHP-FPM socket problems, timeout settings, SELinux, Docker networking, and more.