引用定位

时间：2011-05-16 15:55:57 来源：站内作者：潘春会

    }
    $same = false;
    $key = uniqid("same_obj_", true);
    $var1->$key = $key;
    if (isset($var2->$key) && $var2->$key == $key) {
      $same = true;
    }
    unset($var1->$key);
    return $same;
}

// PHP4 references are risilient as array members
$f1 =& new Foo;
$f2 = array(&$f1);
$f3 = $f2;
echo (int)same_obj($f1, $f3[0]); // 1!
?>

BenBE at omorphia dot de (08-Jan-2007 03:37)

Hi,



If you want to check if two variables are referencing each other (i.e. point to the same memory) you can use a function like this:



<?php



function same_type(&$var1, &$var2){

    return gettype($var1) === gettype($var2);

}



function is_ref(&$var1, &$var2) {

    //If a reference exists, the type IS the same

    if(!same_type($var1, $var2)) {

        return false;

    }



    $same = false;



    //We now only need to ask for var1 to be an array ;-)

    if(is_array($var1)) {

        //Look for an unused index in $var1

        
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