Code Explainers

Php code explainers

php 
<?php
 
namespace App\Reminders;
 

Scheduling reminders across time zones in PHP

timezones datetime immutability
Intermediate 7 steps
php 
<?php
 
namespace App\Http\Middleware;
 

Verifying GitHub webhook signatures in Laravel

middleware hmac webhooks
Intermediate 5 steps
php 
<?php
 
namespace App\Models;
 

How Eloquent scopes model order status in Laravel

query scopes state machine eloquent
Intermediate 7 steps
php 
<?php
 
namespace App\Http\Controllers;
 

Streaming a filtered CSV export in Laravel

streaming csv-export query-builder
Intermediate 9 steps
php 
<?php
 
namespace App\Http\Middleware;
 

Idempotent requests with Laravel middleware

idempotency middleware caching
Advanced 8 steps
php 
<?php
 
namespace App\Services;
 

Batch image resizing with PHP GD

image-processing constructor-promotion match-expression
Intermediate 10 steps
php 
<?php
 
namespace App\Cache;
 

A content-hashed fragment cache in PHP

caching content-hashing atomic-writes
Intermediate 10 steps
php 
<?php
 
namespace App\View\Composers;
 

How a Laravel view composer feeds the navigation

view-composer caching dependency-injection
Intermediate 5 steps
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