典型的應(yīng)用場景：當(dāng)男性用戶訪問網(wǎng)站上顯示男性相關(guān)的類目和廣告，當(dāng)女性用戶訪問網(wǎng)站時顯示女性相關(guān)的類目和廣告，或默認(rèn)訪問時顯示指定相關(guān)的類目和廣告

<?phpinterface UserStrategy {function showAd();function showCategory(); }class FemaleStrategy implements UserStrategy {function showAd(){echo "female ad\n";}function showCategory(){echo "female category\n";} }class MaleStrategy implements UserStrategy {function showAd(){echo "male ad\n";}function showCategory(){echo "male category\n";} }class OtherStrategy implements UserStrategy {function showAd(){echo "other ad\n";}function showCategory(){echo "other category\n";} }class Page {private $strategy;function index(){$this->strategy->showAd();$this->strategy->showCategory();}function setStrategy(UserStrategy $strategy){$this->strategy = $strategy;} }$page = new Page;if($argv[1] == 1) {$strategy = new FemaleStrategy; } elseif ($argv[1] == 2) {$strategy = new OtherStrategy; } else {$strategy = new MaleStrategy; }$page->setStrategy($strategy); $page->index();

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