Code Explainers

Php code explainers

php 
<?php
 
namespace App\Resilience;
 

How a circuit breaker guards a flaky service

circuit-breaker resilience caching
Intermediate 9 steps
php 
<?php
 
namespace App\Jobs;
 

Building a unique queued job in Laravel

queues background-jobs idempotency
Intermediate 7 steps
php 
<?php
 
declare(strict_types=1);
 

An immutable typed collection in PHP

immutability value-objects iterators
Intermediate 8 steps
php 
function deepMerge(array $defaults, array $overrides): array
{
    foreach ($overrides as $key => $value) {
        if (

Recursively merging nested config arrays in PHP

recursion arrays configuration
Intermediate 6 steps
php 
<?php
 
namespace App\Models;
 

Making an Eloquent model searchable with Scout in Laravel

full-text-search indexing eloquent
Intermediate 8 steps
php 
<?php
 
namespace App\Jobs;
 

Serializing balance reconciliation in Laravel

queues concurrency idempotency
Intermediate 7 steps
php 
<?php
 
namespace App\Services;
 

Phone verification codes in Laravel

rate-limiting caching hashing
Intermediate 7 steps
php 
<?php
 
namespace App\Http\Middleware;
 

Verifying webhook signatures in Laravel

hmac middleware webhooks
Intermediate 7 steps
php 
<?php
 
namespace App\Http\Controllers;
 

Streaming job progress with SSE in Laravel

server-sent-events streaming polling
Advanced 8 steps
php 
<?php
 
namespace App\Http\Requests;
 

How a Laravel FormRequest validates invoices

validation authorization form-request
Intermediate 6 steps
php 
<?php
 
namespace App\Config;
 

Writing a .env file loader in PHP

parsing environment-variables configuration
Intermediate 9 steps
php 
<?php
 
namespace App\Services;
 

Placing an order atomically in Laravel

transactions pessimistic-locking concurrency
Advanced 8 steps
php 
<?php
 
namespace App\Database;
 

Building a fluent SQL query builder in PHP

fluent-interface method-chaining sql
Intermediate 10 steps
php 
<?php
 
namespace App\Http\Controllers;
 

Time-limited signed download links in Laravel

signed urls authorization file streaming
Intermediate 6 steps
php 
<?php
 
namespace App\Http\Requests;
 

Normalizing input in a Laravel FormRequest

validation authorization input-normalization
Intermediate 6 steps
php 
<?php
 
namespace App\Http;
 

Building an onion middleware pipeline in PHP

middleware closures array-reduce
Advanced 9 steps
php 
<?php
 
namespace Database\Seeders;
 

Building blog test data with Laravel factories

seeding factories relationships
Intermediate 9 steps
php 
<?php
 
namespace App\Notifications;
 

How a queued weekly digest email works in Laravel

notifications queues email
Intermediate 7 steps