In-depth analysis of lists in PHP (with code examples)

​ PHPThere are several ways to assign the value of an array to a set of variables. It is more convenient to use the extract() function, but for index array Language is more troublesome, so we can use list to solve this problem. This article will take you to take a look.

First, let’s take a look at the syntax of list():

list    ( mixed $var   , mixed ...$vars = ?   ) = $arr

• $arr: Specify array
  

• $var: a variable.

• #$vars: More variables.

• Return value: Return the specified array.

Code example:

1. List all variables in the array:

<?php
$info = array(&#39;coffee&#39;, &#39;brown&#39;, &#39;caffeine&#39;);
list($drink, $color, $power) = $info;
echo "$drink is $color and $power makes it special";
?>

输出：coffee is brown and caffeine makes it special

2. Omit one variable in the array:

<?php
$info = array(&#39;coffee&#39;, &#39;brown&#39;, &#39;caffeine&#39;);
list($drink, , $power) = $info;
echo "$drink has $power.";

输出：coffee has caffeine.

3. Only the third variable in the array

<?php
$info = array(&#39;coffee&#39;, &#39;brown&#39;, &#39;caffeine&#39;);
list( , , $power) = $info;
echo "I need $power!";

输出：I need caffeine!

4.list() cannot work on strings

<?php
$info = array(&#39;coffee&#39;, &#39;brown&#39;, &#39;caffeine&#39;);
list($bar) = "abcde";
var_dump($bar); // NULL

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