what does $ mean in php

PHP uses the syntax of C language, but there are some differences. "$" is a symbol used to define variables or objects in PHP. The method of using "$" is: "$" plus a string that matches the PHP variable name definition form a variable.

For example:

class Test
{
    private $a;    //定义变量
    public function foo1(){
        return $this->a;
    }
    public function foo2(){
        return $this->a;
    }
}

$test = new Test;
echo $test->foo1();

Test is a class name, no $ symbol is needed; $a is a private variable, usually composed of $ and a string; foo1 and foo2 are two member variables, There is no need to add the $ sign; $test is an object and must be added with the $ sign.

Recommended tutorial: "PHP Tutorial"

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