Vladimir Pichkurov

Articles

• Database Indexes: Under the Hood and Deep Dive

  architecture

  A comprehensive developer's guide to B+Trees in InnoDB, Heap structures in Postgres, index node pointers, composite index rules, advanced index types, and write amplification.

• Databases under load: queries, indexes, MySQL vs Postgres, scaling | DevSense

  architecture

  How to optimize SQL and schema, choose index types, when database-side logic becomes a liability, how MySQL and PostgreSQL differ in production, and what vertical scale, replicas, decomposition, and sharding really cost.

• Database Query Optimization: Master Class

  architecture

  Learn how to read EXPLAIN and EXPLAIN ANALYZE, optimize JOINs and CTEs, implement keyset pagination, and understand database engine MVCC load behaviors.

• Designing high-load event ingestion systems | DevSense

  architecture

  How to handle thousands of incoming HTTP events per second: edge validation, buffering layers, batch writing to storage, and avoiding database connection starvation under spike load.

• Message queues compared: Redis, RabbitMQ, Kafka | DevSense

  architecture

  How to choose a broker for async work: comparing memory queues (Redis), AMQP brokers (RabbitMQ), and commit logs (Kafka) based on ordering, scale, durability, and operational cost.

• Observability: logs, metrics, and health for Laravel and microservices | DevSense

  architecture

  How to monitor application state across environments and load: structured logging, metrics, traces, correlation IDs across services, and a practical spectrum of tools from classic syslog to Prometheus, Loki, OpenTelemetry, and SaaS APM.

• PHP apps and the database connection pool bottleneck | DevSense

  architecture

  Why PHP-FPM and workers multiply database sessions, how middle-tier poolers and proxies share real server connections, and what Laravel teams should know about PgBouncer modes, ProxySQL, and prepared statements.

• Web attacks & defenses: XSS, CSRF, SQLi, SSRF, IDOR, and file uploads | DevSense

  architecture

  The web attacks you’ll meet most often: injections (SQL/command), XSS, CSRF, IDOR/access-control bugs, SSRF, unsafe file uploads, clickjacking, and configuration pitfalls. Practical mitigations, headers, and checklists.

• API Gateway Architecture: PHP, Node, Go, Rust, gRPC & RabbitMQ | DevSense

  microservices

  How to design an API gateway at the edge of your microservice mesh: comparing PHP, Node, Go, and Rust, managing internal gRPC and RabbitMQ traffic, and avoiding common routing pitfalls.

• PHP 5.3: Namespaces, Closures, Late Static Binding & Migration | DevSense

  php

  Upgrade guide for PHP 5.3: Master namespaces, late static binding, closures, NOWDOC, Phar, and cycles garbage collection while navigating fatal BC breaks like deprecated ereg and call-time pass-by-reference removal.

• PHP 5.4: Traits, Short Arrays [], Built-in Server & Migration | DevSense

  php

  PHP 5.4 upgrade guide: Learn traits, short array syntax, callable type hints, automatic $this in closures, and how to migrate legacy code after the removal of magic quotes and register_globals.

• PHP 5.5: Generators, finally, password_* API & Migration | DevSense

  php

  PHP 5.5 upgrade guide: Learn memory-efficient generators (yield), try-catch finally blocks, the native password hashing API, ClassName::class syntax, and how to migrate away from deprecated mysql and preg_replace /e.

• PHP 5.6: Variadics, Argument Unpacking, ** & Migration | DevSense

  php

  PHP 5.6 upgrade guide: Learn variadic parameters, argument unpacking with ..., the exponentiation operator **, use function/const namespace imports, constant expressions, hash_equals, and strict SSL/TLS defaults.

• PHP 7.0 from 5.6: Zend Engine 3, Scalar Types, ??, <=> & Migration | DevSense

  php

  PHP 7.0 upgrade guide: scalar type declarations, return types, null coalescing (??), spaceship operator (<=>), anonymous classes, Throwable, CSPRNG, and major BC breaks.

• PHP 7.1 from 7.0: Nullables, void, Symmetric Destructuring & Migration | DevSense

  php

  PHP 7.1 upgrade guide: nullable types, void returns, class constant visibility, symmetric array destructuring, iterable pseudo-type, multi-catch, negative string offsets, and BC breaks.

• PHP 7.2 from 7.1: object Type, Widening, Libsodium & Migration | DevSense

  php

  PHP 7.2 upgrade guide: object type hint, parameter type widening, PDO debug dumps, LDAP EXOP, addrinfo sockets API, libsodium—plus BC (count, get_class, object/array casts) and mcrypt removed to PECL.

• PHP 7.3 from 7.2: Flexible Heredoc, JSON Exceptions, PCRE2 & Migration | DevSense

  php

  PHP 7.3 upgrade guide: flexible heredoc/nowdoc, trailing commas in calls, reference destructuring, is_countable, array_key_first/last, JsonException, Argon2id, PCRE2—and BC breaks that affect real code.

• PHP 7.4 from 7.3: Typed Properties, Arrow Functions, FFI & Migration | DevSense

  php

  PHP 7.4 upgrade guide: typed properties, arrow functions, variance, ??=, spread in arrays, WeakReference, __serialize/__unserialize, OPcache preloading, FFI—and the BC breaks that hit real apps.

• PHP 8.0 from PHP 7.4: JIT, Union Types, Match & Nullsafe — Upgrade Guide | DevSense

  php

  Explore PHP 8.0 after 7.4: named arguments, match, nullsafe, attributes, JIT, union types—what breaks, what to rewrite, and runnable examples.

• PHP 8.1: Enums, Fibers, Readonly & Intersection Types — PHP Upgrade Guide | DevSense

  php

  PHP 8.1 after 8.0: enums, readonly properties, fibers, intersection/never types, first-class callables—plus $GLOBALS rules, MySQLi exceptions, and a deprecation watchlist.

• PHP 8.2: What’s New — Types, Readonly Classes, Security & Migration | DevSense

  php

  PHP 8.2 guide: readonly classes, standalone null/false/true types, DNF types, #[SensitiveParameter], Random extension, dynamic property deprecations, and BC breaks from 8.1.

• PHP 8.3: Typed Constants, #[Override], json_validate & Upgrade Notes | DevSense

  php

  PHP 8.3 from 8.2: #[Override], typed class constants, readonly clone tweaks, json_validate, str_increment/str_decrement, safer range() and proc_get_status(), assert INI deprecation, and migration pitfalls.

• PHP 8.4: Property Hooks, Lazy Objects, New DOM & Migration Guide | DevSense

  php

  PHP 8.4 upgrade notes (from 8.3): Property Hooks, asymmetric visibility, Lazy Objects, #[Deprecated], request_parse_body(), new Dom\* API, new array_* helpers, and the most important BC breaks & deprecations.

• PHP 8.5: Pipe Operator, NoDiscard, URI Extension & Migration | DevSense

  php

  PHP 8.5 from 8.4: |> pipe operator, #[NoDiscard] and (void), closures in constant expressions, ext/uri, FILTER_THROW_ON_FAILURE, Opcache in binary, PDO fetch constant changes, and deprecations to plan for.

• PHP on the server: FPM, Swoole, workers & event-loop runtimes | DevSense

  php

  Master modern PHP execution environments: Compare PHP-FPM, long-lived application servers (Swoole, RoadRunner, FrankenPHP), and ReactPHP/AMPHP async event loops, while avoiding memory leaks.

• Laravel Sail: databases, Redis, Postgres, MongoDB, RabbitMQ in Docker Compose | DevSense

  tools

  Compose-first recipes for Laravel Sail: add Redis, switch to PostgreSQL, run MongoDB with the PHP extension, RabbitMQ sidecar, Mailpit and Meilisearch wiring, healthchecks and named volumes.

• Laravel Sail: .env layout, port forwards, CI, and local vs production | DevSense

  tools

  Split Laravel Sail and host configuration: .env.example, FORWARD_* ports, APP_URL in Docker, optional env_file, GitHub Actions with docker compose, and checklists when Sail is not your server.

• Laravel Sail: queue workers, Horizon, Redis, RabbitMQ & failed jobs | DevSense

  tools

  Run Laravel queues inside Sail: sync vs redis vs database, queue:work and Horizon locally, RabbitMQ with community drivers, failed_jobs, queue:restart, and how production differs.

• Laravel Sail: troubleshooting WSL2, permissions, ports, rebuilds, OPcache & Vite | DevSense

  tools

  Fix common Laravel Sail pain points: WSL2 file sync, UID/GID and storage permissions, FORWARD_* port clashes, stale Docker layers, OPcache and Xdebug in dev, npm/Vite split host vs container, and safe volume resets.

• Laravel Sail: Docker local stack, PHP versions, Redis, Postgres, queues & deploy notes | DevSense

  tools

  Practical Laravel Sail guide: change PHP version, add Redis or RabbitMQ, switch MySQL to PostgreSQL, MongoDB notes, queue workers in containers, env separation, and how Sail differs from dev/staging/production servers.

• Senior PHP Developer (Laravel)

  jobs

  Join the DevSense team as a Senior PHP Developer to work on high-traffic documentation platforms, APIs, and microservices ecosystems.