


A brief talk about PHP linked list data structure (singly linked list), a brief talk about single chain
Linked list: is an ordered list , but it is stored dispersedly in the memory. Using linked lists can solve problems like Joseph's problem, sorting problem, search problem, generalized table
One-way linked list, two-way linked list, circular linked list
The bottom layer of PHP is C. When a program is running, the memory is divided into five areas (heap area, stack area, global area, constant area, code area)
Provisions: Basic data types, generally placed in the stack area
Composite data types, such as objects, are placed in the heap area
Define a class Hero
Define member attribute ranking $no
Define member attribute name $name
Define member attribute nickname $nickname
Define member attribute $next, which is a reference pointing to the next Hero object
Define the constructor and pass parameters: $no, $name, $nickname
Create a head, which is just a header and does not put data
Get the $head object, new Hero()
Get the first Hero object $hero, new Hero(1,"Song Jiang","Timely Rain")
Connect two objects, $head->next=$hero
Get the second Hero object $hero2, new Hero(2,"Lu Junyi","Yu Qilin")
Connect two objects, $hero->next=$hero2
Traverse the linked list
Define a function showHeros(), parameter: $head object
Define a temporary variable $cur to store the $head object
while loop, condition $cur->next is not null
Print it
Move the pointer backward, $cur=$cur->next
PHP version:
<?php /** * 英雄类 */ class Hero{ public $no; public $name; public $nickname; public $next=null; public function __construct($no='',$name='',$nickname=''){ $this->no=$no; $this->name=$name; $this->nickname=$nickname; } } class LinkListDemo{ public static function main(){ $head=new Hero(); $hero1=new Hero(1,"宋江","及时雨"); $head->next=$hero1; $hero2=new Hero(2,"卢俊义","玉麒麟"); $hero1->next=$hero2; LinkListDemo::showHeros($head); } /** * 展示英雄 */ public static function showHeros($head){ $cur=$head; while($cur->next!=null){ echo "姓名:".$cur->next->name."<br/>"; $cur=$cur->next; } } } LinkListDemo::main();
java version:
class Hero{ public int no; public String name; public String nickname; public Hero next=null; public Hero(){ } public Hero(int no,String name,String nickname) { this.no=no; this.name=name; this.nickname=nickname; } } public class LinkListDemo { /** * @param args */ public static void main(String[] args) { Hero head=new Hero(); Hero hero1=new Hero(1, "宋江", "及时雨"); head.next=hero1; Hero hero2=new Hero(2, "卢俊义", "玉麒麟"); hero1.next=hero2; showHeros(head); } /** * 展示英雄 * @param head */ public static void showHeros(Hero head){ Hero cur=head; while(cur.next!=null){ System.out.println("姓名:"+cur.next.name); cur=cur.next; } } }
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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