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PHP design patterns

PHP Design Patterns

  • A catalogue of php design pattern shorts
    • Accumulator passing
    • Closure
    • Control abstraction
    • Coroutines (generator based)
    • Dynamic dispatch
    • Dynamic loading
    • Facade
    • Factory and Abstract Factory
    • Fluent Interfaces/ Method chaining
    • Generator (iterator protocol based)
    • Generic function
    • Hooks
    • Interpreter
    • Iterator (based on protocol method)
    • Lazy evaluation
    • Memoization
    • Nested scope
    • Observer
    • Partial Evaluation
    • Protocol method
    • Proxy
    • Singleton
    • State
    • Strategy Pattern
  • Models, records, databases, friends and foes

Similar things

  • Learning lessons from Lisp or patterns and languages in PHP
  • Emulating closures in PHP
  • Some ways to use saved state with closures in php
  • Scoped php functions or more ways to abuse php
  • PHP Design Patterns
  • Strategy Pattern
  • Singleton
  • Factory and Abstract Factory
  • Facade
  • Partial Evaluation

Home » PHP Design Patterns » A catalogue of php design pattern shorts

Memoization

design patterns | php
Intent
Cache result after computing it.
Motivation
Eliminate repeated database queries
Implementation
Simply cache the result into an array or other appropriate type
Examples
with functions
function db_get_something( $x ) { static $cache = array(); if(empty($cache[$x])) { $cache[$x] = //some db query result; } return $cache[$x]; }
with objects
class db_get_somethning { private $cache = array(); function func() { if(empty($this->cache[$x])) $this->cache[$x] = //some db query result; return $this->cache[$x]; } }
Complications
cache lifetime, size, invalidation
‹ Lazy evaluationupNested scope ›
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Home » PHP Design Patterns » A catalogue of php design pattern shorts

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