Can php array key values ​​be variables?

php array key values ​​can be variables. An array is a special variable that can store multiple values ​​in a single variable. The stored value can be set as a variable, or the list() statement can be used to convert the array elements into variables. The syntax is "list(var1,var2... )".

The operating environment of this tutorial: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

The elements in the php array can be variables

What is the array?

An array is a special variable that can store multiple values ​​in a single variable.

If you have a list of items (for example: a list of car names), store it into a single variable like this:

$cars1="Volvo";
$cars2="BMW";
$cars3="Toyota";

However, if you want to iterate through the array and find What about a specific one? What if the array has not just 3 items but 300?

The solution is to create an array!

Arrays can store multiple values ​​in a single variable, and you can access the values ​​within them based on their keys.

Creating arrays in PHP

In PHP, the array() function is used to create arrays:

array();

In PHP, There are three types of arrays:

Numeric array - an array with numeric ID keys

Associative array - an array with specified keys, each key is associated with a value

Multidimensional array - an array containing one or more arrays

Examples are as follows:

<?php
$a=&#39;钓鱼岛&#39;;
$b=&#39;是中国的&#39;;
$arr = array($a,$b);
var_dump($arr);
?>

Output results:

Extended knowledge

list() is used to assign values ​​to a set of variables in one operation. This function only works with numerically indexed arrays, and assumes that numerical indexing starts at 0.

Note: list() is actually a language structure, not a function.

Syntax:

list(var1,var2...)

Parameters:

var1 Required. The first variable to be assigned a value.

var2,... Optional. More variables need to be assigned values.

The above is the detailed content of Can php array key values ​​be variables?. For more information, please follow other related articles on the PHP Chinese website!