php执行的困惑

时间:2023-03-09 17:48:41
php执行的困惑

最近在用php语言实现各种数据结构算法排序,可以说是很蛋疼的一件事,最近遇到了一个问题,不知道是什么原因,姑且放到这里,希望能看到的人予以帮助

首先我用php写了这样一个类

class ListNode
{
private $val;
private $next=null; function __construct($val)
{
$this->val=$val;
} public function __get($propertyName){
return $this->$propertyName;
} public function __set($name,$value){
$this->$name=$value;
}
}

然后是一个算法

 function partitionLinkedList($head,$x){
var_dump($head);
$dummy=new ListNode(0);
$pivot=new ListNode($x);
$first=$dummy;
$second=$pivot;
$curr=$head->next; while ($curr!=null) {
// var_dump($curr);
$next=$curr->next;
echo $curr->val;
if($curr->val<$x){
$first->next=clone $curr;
$first=$curr;
$first->next=null;
}else{
$second->next=clone $curr;
$second=$curr;
$new2=new ListNode(100);
// $second->next=null;
$second->next=$new2;
}
echo "dummy";
var_dump($dummy);
echo "pivot";
var_dump($pivot);
$curr=$next;
}
$first->next=$pivot->next;
return $dummy;
} $arr=array(4,3,2,1,2,5);
$L=new ListNode(0);
$L1=$L;
foreach ($arr as $nodeval) {
// echo $nodeval." ";
$new = new ListNode($nodeval);
// echo $new->val.' ';
$L1->next=$new;
$L1=$new;
// echo $L1->val;
// echo "<br/>";
}

问题就出在第16行和第21行,下面是执行的截图

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" 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+nlz05Q69r1Hws7bmr6cC6zyWEVAIcjjA1eURzyPVbmvrqI2mntxpQTToGl/njy6R4/t55+vb5//+m/btu3H+51f5LGAUfJQuRgcOhrwB4q88kDvQ55y9+Wx3/Z9e/388wejxyJqJx5qBFB1/C68eWalvCyfXA386/Nn43LycOYhTmEkyYIznLZpVd4wPzbfqgBqvSvQRg9XlIdZrn6SlRcv9RqQjf0mRuF320OuFp6HR5OHD/KAKpAHgAR5AEiQx3WZcX92Kk7AkVt5zbf75oE8DOLf5aC4bPtVUbUFk98djthpCMMpz29Yh0I/BeRhc0I35rswT3WGZHpsS81R8sjDQB7LuIs8ZmjDtHDMyH5tOGcj8gjWPBPk0bKb3lyeTGPM+ltNhrV5TGzm8ohfoLIZCf5oIVLzfJ5dHsfvJnJsNmyzY5rdTwULzVNxs0l46iApDNYMBh9pvgrkMVIeef/qa6Aqj9VFFWPzbR7/3bQkzML8elWoyOMGnDN6ONXip4olxVNJ+Qx5xONBHjfgLpOrTSd3XDm5Bcdmbt8ZMSI1g5fjn1rOs8tjK60448OCqu/Y8e2bkajyYthmtcSXCsn3ZYatLqd47crCEpBHIyqtB3KpRIngBOx0BFV1TgZ51KH6ZnhIkAeABHkASJAHgAR5PBoz1kVPu9ZCHtM5P7F6PM6437rqh076/y9P5HFd2vrsIWoM7mbEaf7PoJs5qqJZIcjjuiycz8xwPXAMqQ0PeYTovFq1J72/9TeVjyX+DrRyZJqNh130e2wSt78z6Afey8TDY3JVwZBtweRgf2t+Z2qWkuSoWd/J2tr0Nc06vuYNXL5CVIeiepkgjB4h+keP4rGqn5QUxwSzrRpSmiM3XZvehxAZPZwORdUpgjxCXEQeeV8YsdmZsrnrzZVrg4shP/COPJYxSh7BZFIjgKqjZON7D2IqU4U6fPRovnPVLA/uXFXTc7X+PFgVRtLOMWJW67kEx/WuHxV8M1XaSIbTJLCkpm+NfY86OuUxMBK4BcijzNiuFG4E8gCQIA8ACfIAkCCPR+O0ZdIzrMeQx3TOz6HTPPY4mvGU++9//P3+KhYGQR7Xpa17nqQNc8+k0+akvwMxlYA8ytxOHqtD+MWkYCaNIcHCIsijArWjbO7sqmrJ5rRZ2dm6btiEURvPyq8KtW0063zKfZ8XHSdI6ngvMe3URr4hj1qOmZSUm6mTV8vrJxJSbR3vkbDztqYv5wKrPFYRVMh2yPJjuiOPMVzkid38lDnU5G2be3GlBNOgaX+ePIrzK1MJyGM8F5GHysXg0NGAP1DklQd673/KHXmcxNM+0F6Ux5LJVXBdjjxO4jkfaE8a5sfmWxVArXdFXBv+ovxYIS9RhUGQR5QZ3SdcHORRprnbhruDPAAkyANAgjwAJMgDQII8ACRPJw9evKpe/Vl3G3kAnA/yAJAgDwAJ8gCQIA8ACfIAkCAPAAnyAJAgDwAJ8gCQ/A9VUQlSqSX2PwAAAABJRU5ErkJggg==" alt="" />

如图所示,当我将链表的next设置为null时,第一遍循环并没有将后续next变为null,却在第二遍循环以后将后续next变为null,不理解是为什么,所以发到这儿希望大家帮助,详细代码可以到我的github上下载(https://github.com/xzjs/interview_php/blob/master/t31.php)