What is the difference between php and js

There are differences between PHP and JS in the way of embedding pages, output syntax, data types, defining variables, string splicing, and type conversion

Embedded page method

JS embedding method:

<script></script>

PHP embedding method:

<?php     
?>(常用)

Output syntax

Javascript Output

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

PHP output

echo（常用）//可同时输出多个字符串　　
print　　//只能输出一个字符串　　　　　 
print_r();//可以打印数组
var_dump();//可输出变量的内容、类型和长度

Data type

JS data type

Integer type (integer) int

Single precision decimal float

Double precision decimal double

Decimal decimal

Boolean bool (can only store two states)

Date and time type datetime

Character char (not commonly used) strong

String string (not commonly used) strong

PHP data type

bool Boolean type (storage two types Status)
int integer type
float(double) floating point type
char character
string string string

Define variable

JS Define variables:

var a = 10;

Note: If you define an integer or decimal variable, the value after the equal sign is written directly; if you define a string variable, the value after the equal sign needs to be enclosed in double quotes or single quotes)

PHP defines variables:

$a = 5；　　$a = "hello"；　　$a = <<<A　

Note: If you define an integer or decimal variable, the value after the equal sign is written directly; if you define a string variable, the value after the equal sign needs to be enclosed in double quotes or single quotes. )

String splicing

String splicing in JS:

" "; eg: "hello" "world"

String splicing in PHP:

"."; eg: "hello"."world"

Type conversion

Type conversion in JS

转化为整数：parseInt();
转化为小数：parseFloat();
判断是否为合法数字类型：isNaN();

Type conversion in PHP

$a = (Int)$a;　　//强制转化变量a为整数
$b = settype($b,"string");　　//强制转化变量a为字符串

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