php双向链表+性能,php 双向链表

php双向链表+性能,php 双向链表

class student

{

public $name;                    //姓名

public $id;

public $gender;                  // 性别

public $chinese;

public $math;

public $english;

public $computer;

public $prev = null;            //前节点

public $next = null;            //后节点

function __construct($name="",$id="",$gender="",$chinese="",$math="",$english="",$computer="") {

$this->name = $name;

$this->id = $id;

$this->gender = $gender;

$this->chinese = $chinese;

$this->math = $math;

$this->english = $english;

$this->computer = $computer;

}

public static function findStudent($head,$student,$type='id')

{

$temp = $head;

$isFind = false;

while (!is_null($temp)) {

if ($temp->$type == $student->$type) {

$isFind = true;

break;

}

$temp=$temp->next;

}

if ($isFind) {

echo "n找到：学生姓名：".$temp->name."  学号:".$temp->id."  性别：".$temp->gender."  语文：".$temp->chinese."  数学：".$temp->math."  英语：".$temp->english."  计算机:".$temp->computer."";

}else {

echo "没有找到该学生信息";

}

}

/**

* 添加学生信息

*

* @param unknown_type $head

* @param unknown_type $student

*/

public static function insertStudent($head,$student)

{

$temp = $head;

if(is_null($temp->next)){

$temp->next = $student;

$student->prev = $temp;

}else{

$isAdd = true;

while ( !is_null($temp->next)) {

if ($temp->next->id > $student->id) {

break;

}elseif ($temp->next->id == $student->id)

{

echo "学号相同";

$isAdd = false;

}

$temp = $temp->next;

}

if ($isAdd) {

$student->next = $temp->next;

$student->prev = $temp;

//$temp->next->prev = $student;

$temp->next = $student;

}

}

}

/**

* 删除学生信息

*

* @param unknown_type $head

* @param unknown_type $student

*/

public static  function delStudent($head,$student)

{

$temp = $head->next;

$isFind = false;

while (!is_null($temp)) {

if ($temp->id == $student->id) {

$isFind = true;

break;

}

$temp=$temp->next;

}

if ($isFind) {

if (!is_null($temp->next)) {

$temp->next->prev=$temp->prev;

}

$temp->prev->next=$temp->next;

echo "删除的学生为".$temp->name."  学号:".$temp->id."  性别：".$temp->gender."  语文：".$temp->chinese."  数学：".$temp->math."  英语：".$temp->english."  计算机:".$temp->computer."";

}else {

echo "没有找到该学生信息";

}

}

/**

* 展示全部学生信息

*

* @param unknown_type $head

*/

public static function showAllStudent($head)

{

$temp = $head->next;

while (!is_null($temp)) {

echo "n学生姓名：".$temp->name."  学号:".$temp->id."  性别：".$temp->gender."  语文：".$temp->chinese."  数学：".$temp->math."  英语：".$temp->english."  计算机:".$temp->computer."";

$temp=$temp->next;

}

}

}

$head = new student();

$student1 = new student("张永伟","98","男","100","100","100","100");

$student2 = new student("魏海龙","99","男","100","100","100","100");

$student3 = new student("宋老师","100","男","100","100","100","100");

$student4 = new student("杨老师","97","男","100","100","100","100");

$student5 = new student("李杰","96","男","100","100","100","100");

student::insertStudent($head,$student1);

student::insertStudent($head,$student2);

student::insertStudent($head,$student3);

student::insertStudent($head,$student4);

student::insertStudent($head,$student5);

echo "n删除宋老师:n";

student::delStudent($head,$student3);

echo "n全部学生信息遍历：";

student::showAllStudent($head);

echo "n查找学生张永伟：";

student::findStudent($head,$student1);

?>