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40 lines
852 B
PHP
40 lines
852 B
PHP
<?php
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namespace DesignPatterns\Strategy;
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/**
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* strategy pattern
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*
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* Terminology:
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* - Context
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* - Strategy
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* - Concrete Strategy
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*
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* Purpose:
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* to separate strategies and to enable fast switching between them.
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* also this pattern is a good alternative to inheritance (instead of having an abstract class that is extended)
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*
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* Examples:
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* - sorting a list of objects, one strategy by date, the other by id
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* - simplify unit testing: e.g. switching between file and in-memory storage
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*
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*/
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$elements = array(
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array(
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'id' => 2,
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'date' => '2011-01-01',
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),
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array(
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'id' => 1,
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'date' => '2011-02-01'
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)
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);
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$collection = new ObjectCollection($elements);
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$collection->setComparator(new IdComparator());
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$collection->sort();
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$collection->setComparator(new DateComparator());
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$collection->sort();
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