The meaning of the connection symbols greater than sign and equal sign greater than sign in PHP-PHP Problem-php.cn

The meaning of the connection symbols greater than sign and equal sign greater than sign in PHP

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Release： 2023-03-09 10:44:01

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The meaning of the connection symbols greater than sign and equal sign greater than sign in PHP

## While studying

PHP, I encountered -> and => these two symbols.

When I first encountered these two symbols, I didn’t know what they represented. I only discovered the secrets of these two symbols after going through Baidu.

Let’s take a look at the secret of -> in PHP, as shown below.

<?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;
?>

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In this, we can see that a speedUp method is defined in the class. In this method, we can see
$this->speed =10, this line of code. ->What does it represent?

After going through Baidu, I think it represents the meaning of the word "的" in Chinese characters. For example, this line of code translates to the speed of $this equal to speed plus 10. Of course this only represents my own point of view, please let me know if I am wrong.

The next step is =>. Simply put, it is the => symbol to separate keys and values. The left side represents the key and the right side represents the value. Let’s look at some code.

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

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In this code, first declare an arr array, and then declare a key where arr0 is equal to Apple. Then use IF to determine whether it exists. If it exists, output the value on the right side of the key in the array. .

To put it simply, it means giving someone a nickname, using a nickname to represent a certain person, and by mentioning his nickname, you can know who he is.

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