PHP PSR-6 vs PSR-16 Cache Interfaces

The feature illustrated below operates on PHP values, objects, or language metadata.

What Is PSR-6 vs PSR-16 Cache Interfaces in PHP?

Interfaces define contracts, inheritance specializes related types, and composition delegates responsibilities to collaborators.

Example 1: Understanding the Basic Behavior

<?php

interface Reporter { public function report(): string; }
class JsonReporter implements Reporter { public function report(): string { return '{"ok":true}'; } }
echo (new JsonReporter())->report();

Output:

{"ok":true}

Explanation: Interfaces define contracts, inheritance specializes related types, and composition delegates responsibilities to collaborators.

Example 2: Testing Another Case

<?php

class Logger { public function write(string $message): void { echo $message; } }
class Worker { public function __construct(private Logger $logger) {} public function run(): void { $this->logger->write('working'); } }
(new Worker(new Logger()))->run();

Output:

working

Explanation: PSR-6 models cache items and pools; PSR-16 defines a simpler key-value cache contract.

Practical Example: Applying the Operation

<?php

abstract class Payment { abstract public function label(): string; }
class CardPayment extends Payment { public function label(): string { return 'Card'; } }
echo (new CardPayment())->label();

Output:

Card

Explanation: Both standards are interfaces, not storage engines; a concrete implementation must define expiration, serialization and backend behavior.

Important Behavior and Edge Cases

• PSR-6 models cache items and pools; PSR-16 defines a simpler key-value cache contract.
• Both standards are interfaces, not storage engines; a concrete implementation must define expiration, serialization and backend behavior.

Comparison With Related Approaches

Common Beginner Mistakes

Key Takeaways

• Interfaces define contracts, inheritance specializes related types, and composition delegates responsibilities to collaborators.
• PSR-6 models cache items and pools; PSR-16 defines a simpler key-value cache contract.
• Both standards are interfaces, not storage engines; a concrete implementation must define expiration, serialization and backend behavior.

The examples demonstrate where PSR-6 vs PSR-16 Cache Interfaces fits within php programming. Verify the relevant preconditions whenever you adapt the code to real data.