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获取变量/成员的最有效方法

semantics php

TCCV · 技术社区 · 14 年前

在处理围绕对象传递的变量时,我一直使用getter/setter类型。我发现这在语义上是正确的,而且更容易“阅读”(没有长列表函数参数)。但我觉得效率比较低。

class bogus{
    var $member;

    __construct(){   
        $foo = "bar"
        $this->member = $foo;
        $this->byGetter();
        $this->byReference($foo);
        $this->byValue($foo);
    }

    function byGetter();{
        $baz =& $this->member; 
        //set the object property into a local scope variable for speed
        //do calculations with the value of $baz (which is the same as $member)
        return 1;
    }

    function byReference(&$baz){
        //$baz is already set as local.  
        //It would be the same as setting a property and then referencing it
        //do calculations with the value of $baz (same as $this->member)
        return 1;
    }

    function byValue($baz){
        //$baz is already set as local.  
        //It would be the same as setting a property and then assigning it
        //do calculations with the value of $baz 
        return 1;
    }
}

1 回复 | 直到 14 年前

Andreas Linden 14 年前

另外,不赞成通过引用传递非对象,所以不要这样做。另外,所有对象都会自动通过引用传递,直到您明确地复制内存(即使用克隆)。只要使用像这样的干净结构,你就会没事了:)

class Example_SetterGetter
{
    /**
     * @var stdClass
     */
    protected $_myObj;

    /**
     * A public constructor
     * 
     */
    public function __construct(stdClass $myObj = null)
    {
        if ($myObj !== null)
        {
            $this->setMyObj($myObj);
        }
    }

    /**
     * Setter for my object
     * @param stdClass $var
     * @return Example_SetterGetter
     */
    public function setMyObj(stdClass $var)
    {
        $this->_myObj = $var;
        return $this;
    }

    /**
     * Getter for my object
     * @return object
     */
    public function getMyObj()
    {
        return $this->_myObj;
    }
}

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