Code Explainers

Php code explainers

php 
public function transaction(callable $callback, int $maxAttempts = 3): mixed
{
    $attempt = 0;
 

Retrying database deadlocks in PHP

retry transactions deadlock
Intermediate 8 steps
php 
<?php
 
namespace App\Services;
 

Managing many-to-many tags in Laravel

many-to-many pivot-table collections
Intermediate 9 steps
php 
<?php
 
namespace App\Services;
 

Optimistic locking on invoices in Laravel

optimistic-locking transactions concurrency
Advanced 6 steps
php 
<?php
 
namespace App\Providers;
 

Defining rate limiters in Laravel

rate limiting service provider closures
Intermediate 7 steps
php 
<?php
 
function fetchAll(array $urls, int $concurrency = 10, int $timeout = 15): array
{

Bounded-concurrency HTTP fetching with curl_multi

concurrency http curl
Advanced 8 steps
php 
<?php
 
namespace App\Support;
 

How TOTP codes are generated in PHP

totp hmac two-factor-auth
Advanced 7 steps
php 
<?php
 
namespace App\Http\Middleware;
 

ETag caching and gzip in Laravel middleware

middleware http-caching etag
Intermediate 8 steps
php 
<?php
 
namespace App\Http\Resources;
 

Shaping API JSON with a Laravel Resource

api serialization data transformation
Intermediate 7 steps
php 
final class DebouncedSessionStore
{
    private array $pending = [];
    private array $timers = [];

Debouncing session writes with an event loop

debounce event-loop atomic-write
Advanced 9 steps
php 
<?php
 
function parseMultipartEmail(string $raw): array
{

Parsing multipart emails with mailparse

mime-parsing email encoding
Intermediate 9 steps
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