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Strategy

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`@@ -11,6 +11,7 @@ See details on http://maxsite.org/page/php-patterns`
`11`	`11`	`* "Registry" (Structural)`
`12`	`12`	`* "Composite" (Structural)`
`13`	`13`	`* "Builder" (Creational)`
	`14`	`+* "Strategy" (Behavioral)`
`14`	`15`
`15`	`16`
`16`	`17`	`(c) MaxSite.org, 2019, http://maxsite.org/`

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`@@ -0,0 +1,73 @@`
	`1`	`+<?php`
	`2`	`+`
	`3`	`+/**`
	`4`	`+ * Design pattern "Strategy" (Behavioral)`
	`5`	`+ * This is demo code`
	`6`	`+ * See for details: http://maxsite.org/page/php-patterns`
	`7`	`+ */`
	`8`	`+`
	`9`	`+/**`
	`10`	`+ * Methods of Strategy`
	`11`	`+ */`
	`12`	`+interface Strategy`
	`13`	`+{`
	`14`	`+ public function execute();`
	`15`	`+}`
	`16`	`+`
	`17`	`+/**`
	`18`	`+ * Strategy A`
	`19`	`+ */`
	`20`	`+class StrategyA implements Strategy`
	`21`	`+{`
	`22`	`+ public function execute()`
	`23`	`+ {`
	`24`	`+ echo 'StrategyA execute<br>';`
	`25`	`+ }`
	`26`	`+}`
	`27`	`+`
	`28`	`+/**`
	`29`	`+ * Strategy B`
	`30`	`+ */`
	`31`	`+class StrategyB implements Strategy`
	`32`	`+{`
	`33`	`+ public function execute()`
	`34`	`+ {`
	`35`	`+ echo 'StrategyB execute<br>';`
	`36`	`+ }`
	`37`	`+}`
	`38`	`+`
	`39`	`+/**`
	`40`	`+ * Base Context`
	`41`	`+ */`
	`42`	`+class Context`
	`43`	`+{`
	`44`	`+ private $strategy;`
	`45`	`+`
	`46`	`+ public function __construct(Strategy $strategy)`
	`47`	`+ {`
	`48`	`+ $this->strategy = $strategy;`
	`49`	`+ }`
	`50`	`+`
	`51`	`+ public function execute()`
	`52`	`+ {`
	`53`	`+ $this->strategy->execute();`
	`54`	`+ }`
	`55`	`+}`
	`56`	`+`
	`57`	`+/**`
	`58`	`+ * demo`
	`59`	`+ */`
	`60`	`+`
	`61`	`+$context = new Context(new StrategyA()); // first strategy`
	`62`	`+$context->execute();`
	`63`	`+/*`
	`64`	`+ StrategyA execute`
	`65`	`+ */`
	`66`	`+`
	`67`	`+$context = new Context(new StrategyB()); // other strategy`
	`68`	`+$context->execute();`
	`69`	`+/*`
	`70`	`+ StrategyB execute`
	`71`	`+ */`
	`72`	`+`
	`73`	`+# end of file`

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