Code Explainers

Php code explainers

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
php 
public function importCustomers(UploadedFile $file): array
{
    $errors = [];
    $imported = 0;

Validating a CSV import in Laravel

csv-parsing validation error-accumulation
Intermediate 8 steps
php 
<?php
 
final class OrderRepository
{

Atomic order placement with PDO transactions

transactions prepared-statements atomicity
Intermediate 8 steps
php 
<?php
 
function buildTree(array $items, ?int $parentId = null): array
{

Building a tree from a flat list in PHP

recursion tree grouping
Intermediate 6 steps
php 
final class ConfigResolver
{
    private array $merged;
 

Layered config merging in PHP

recursion immutability variadics
Intermediate 8 steps
php 
<?php
 
function uploadDocument(string $endpoint, string $filePath, array $meta): array
{

Uploading a file with cURL in PHP

curl file-upload http
Intermediate 8 steps
php 
<?php
 
namespace App\Console\Commands;
 

Streaming CSV imports in Laravel

lazy-evaluation generators batch-processing
Intermediate 7 steps
php 
<?php
 
namespace App\Services;
 

Resilient HTTP retries with Laravel's client

http-client retry-logic error-handling
Intermediate 7 steps
php 
<?php
 
namespace App\Services;
 

Building signed, expiring download URLs in PHP in Laravel

hmac url-signing authentication
Intermediate 7 steps