PHP设计模式之解释器模式浅析（php解析原理）学到了

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<?php
// 抽象表达式类
abstract class Expression
{
abstract public function interpret($context);
}
// 终结符表达式类
class TerminalExpression extends Expression
{
public function interpret($context)
{
if (strpos($context, $this->data) !==false) {
return true;
}
return false;
}
}
// 非终结符表达式类
class OrExpression extends Expression
{
protected $expr1;
protected $expr2;
public function __construct(Expression $expr1, Expression $expr2)
{
$this->expr1=$expr1;
$this->expr2=$expr2;
}
public function interpret($context)
{
return $this->expr1->interpret($context) || $this->expr2->interpret($context);
}
}
class AndExpression extends Expression
{
protected $expr1;
protected $expr2;
public function __construct(Expression $expr1, Expression $expr2)
{
$this->expr1=$expr1;
$this->expr2=$expr2;
}
public function interpret($context)
{
return $this->expr1->interpret($context) && $this->expr2->interpret($context);
}
}
// 上下文类
class Context
{
protected $context;
public function __construct($context)
{
$this->context=$context;
}
public function getContext()
{
return $this->context;
}
}
// 客户端代码
$context=new Context(“Hello, World!”);
$terminal1=new TerminalExpression(“Hello”);
$terminal2=new TerminalExpression(“World”);
$orExpression=new OrExpression($terminal1, $terminal2);
$andExpression=new AndExpression($terminal1, $terminal2);
echo $orExpression->interpret($context->getContext()) ? “True\n” : “False\n”;
echo $andExpression->interpret($context->getContext()) ? “True\n” : “False\n”;