Selected two parameters in PHP that you must fully master (with examples)

The previous article introduced you to "You must understand the parameters of the function (detailed introduction)". This article continues to introduce to you what are parameters? This article comes with examples, so why don’t you come in and take a look! ! !

Last time we talked about the parameters of the function, we will continue to add the following:

The parameters are divided into two parts: formal parameters and actual parameters:

Formal parameters are formal parameters, used in the parentheses of defining functions;

actual parameters are actual parameters, used in parentheses of calling functions;

Note:

• If the function has defined parameters, the corresponding actual parameters must be passed in when calling the function (if the formal parameter has no default value)

• If The function also has the default value of the formal parameter, and the corresponding actual parameter is passed in, then the passed actual parameter is the main one (equivalent to variable assignment, using the value of the actual parameter to assign the value to the formal parameter)

• If you want to pass in actual parameters, they must correspond to the position of the formal parameters;

(Supplementary explanation)

• If there is a default value in the formal parameter, put the formal parameter that is most likely to be the actual parameter in front;

• If If a function has both formal parameters with default values ​​and formal parameters without default values, the formal parameters without default values ​​must be placed before the formal parameters with default values;

• The parameters passed in must correspond to the parameters to avoid logical problems;

Create a game character:

First set the character Name, gender, role, etc., specifically taking the code as an example:

<?php
      //创建游戏角色的功能
      function createPerson($name,$sex,$job,$head = &#39;帽子&#39;, $hand = &#39;灵石&#39;, $close = &#39;广袖流仙裙&#39;){
     //有姓名
      echo &#39; 角色的名称是:&#39;.$name. &#39;<br/>&#39;;
      //有性别 
      echo &#39; 角色的性别是:&#39;.$sex. &#39;<br/>&#39;; 
      echo &#39; 角色的职业是:&#39;.$job.&#39;<br/>&#39;;
      echo &#39; 加载游戏场景，进入游戏<hr/>&#39;;
      //有一些默认初始化的装备
      //头部
      echo &#39; 头顶:&#39; . $head. &#39;<br/>&#39;;
      //武器
      echo &#39;手拿: &#39; . $hand. &#39;<br/>&#39;;
      //衣服
      echo &#39;衣服: &#39; . $close. &#39;<br/>&#39;;
      }
      //用户创建角色
      createPerson(&#39;巧克力慕斯&#39;,&#39;女&#39;,&#39;公主&#39;);
?>

Running results:

Function code analysis for creating game characters ：

First try to initialize a function, use the function function definition to set its name (name) gender (sex) and work content (job), and then we output (echo) the name of a character ( name), and so on, output the game character settings we need, and then we continue to output (echo) about loading the game scene and entering the game. During this period, when we enter the game there will be some default initialized equipment, such as the head Therefore, we continue to output (echo) some code about the head settings, and so on, write other default settings; then, we create the character, (call the function of creating the character [creatperson ();]), after we create the character, we can enter the game.

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