What are PHP arrays? How to use PHP arrays?

Do you know what a PHP array is? Can you write something about arrays in PHP? This article will take you through PHP arrays, come and learn together! ! !

What is an array:

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

php array, the original meaning is the array in PHP. Its characteristic is that it maps values ​​to the type of keys. Compared with other languages, the keys of arrays in PHP can be strings, and the values ​​can be of any type.

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

$cars1="Lamborghini";
$cars2="Maserati";
$cars3="Maybach";

For an array, if you want to iterate over the array And find out a specific one, if the array has not just 1 item but many, then we should create an array at this time! Because array can store multiple values ​​in a single variable and we can access the values ​​in it based on the key.

To create an array in PHP, the syntax is as follows:

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 associated with a value
  

• Multidimensional array - an array containing one or more arrays
  

PHP Numeric Array:

here There are two ways to create a numeric array:

Automatic assignment of ID keys (ID keys always start from 0):

$cars=array("Lamborghini","Maserati","Maybach");

Manual assignment ID key :

$cars[0]="Lamborghini";
$cars[1]="Maserati";
$cars[2]="Maybach";

Specifically, we use code to demonstrate:

The running results are as follows:

Get the length of the array - count() function:

count() function is used to return the length of the array (number of elements):

The running results are as follows:

Recommended learning: "PHP Video Tutorial"

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