php => What does it mean?

php =>What does it mean?

Simply put, the => symbol separates 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",&#39;banana&#39;=>"香蕉",&#39;pineapple&#39;=>"菠萝");
$arr0=$arr["apple"];
if( isset($arr0) ) 
  {print_r($arr0);
}
?>

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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