What is the difference between php and js

php is a script that works on the server side. It submits data to the server for processing, and the server responds to the browser. You have to look at the BS structure for this. Suggestions for learning: Many people learn js first, which is correct, but if you learn PHP first, js is learned with needs, and what you learn will be more targeted.

Embedded page method

　　JS嵌入方式：<script></script>
　　PHP嵌入方式：<?php
　　　　　　　　 ?>(常用)

Output syntax

Javascript output

　　1.alert("警告的内容")
　　2.prompt("提示的内容")
　　3.document.write()(页面输出内容)

PHP output

　　1.echo（常用）//可同时输出多个字符串　　eg：echo $a,"hello";
　　2.print　　//只能输出一个字符串　　　　　 eg：print $a;
　　3.print_r();//可以打印数组
　　4.var_dump();//可输出变量的内容、类型和长度

Data type

JS data type

　　整型（整数）int
　　单精度小数  float
　　双精度小数  double
　　小数 decimal
　　布尔型 bool(只能存两个状态)
　　日期时间类型 datetime
　　字符 char（不常用）强
　　字符串 string（不常用）强

PHP data type

    bool    布尔型（存储两种状态）
    int        整型
    float(double)    浮点型
    char    字符
    string    字符串

Define variables

JS define variables: var a = 10;

（注意：1.如果定义整数或小数的变量，等号后面的值直接写
　　　　2.如果定义字符串变量，等号后面的值需要加双引号或单引号）

PHP define variables:

$a = 5；　　$a = "hello"；　　$a = <<<A　　定义的字符串内容 //也可放HTML代码　　A;　　　　　　　　　　　　　　　　　
（注意：1.如果定义整数或小数的变量，等号后面的值直接写
　　　　2.如果定义字符串变量，等号后面的值需要加双引号或单引号）

String splicing

String splicing in JS:

"+";　　eg："hello"+"world"

String splicing in PHP:

".";　  eg："hello"."world"

There are other differences between PHP and JavaScript There are many, so I won’t introduce them one by one here. Interested friends can check them out by themselves.

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