What do => and -> mean in php

In PHP, "=>" is an array operator, used to correspond to the key value and key name in the array. The syntax is "array(key => value)"; "-> " is used to refer to methods and properties of class instances, and the syntax is "$obj->a".

The operating environment of this article: Windows 10 system, PHP version 7.1, Dell G3 computer.

What do => and -> mean in php

1. The meaning of =>,->:

- > is used by objects to execute methods or obtain attributes.

=> is applied to key and value pairs in the array.

2. Usage

1. Usage of => The relationship between the key and value used in the array. For example:

$a = array('0' => '1','2' => '4',);echo $a['0'];echo $a['2'];

2. -> usage classes are used to refer to the methods and attributes of class instances. For example:

class Test{function add(){return $this->var++;}var $var = 0;}$a = new Test; 
//实例化对象名称
echo $a->add();echo $a->var;

Extended information

The -> code in PHP is as follows:

<?php
class Car {
public $speed = 0;
//增加speedUp方法，使speed加10
public function speedUp(){
$this->speed+=10;
} 
}
$car = new Car();
$car->speedUp();
echo $car->speed;
?>

In PHP => The code is as follows:

<?php
//从数组变量$arr中，读取键为apple的值
$arr = array(&#39;apple&#39;=>"苹果",&#39;banana&#39;=>"香蕉",&#39;pineapple&#39;=>"菠萝");
$arr0=$arr["apple"];
if( isset($arr0) ) 
{print_r($arr0);
}
?>

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