Can php define an array?

Can define arrays. 3 methods: 1. Direct assignment method, the syntax is "$array variable name [subscript] = value;", where the subscript (key name) can be a string or an integer, and the subscript can be omitted; 2. Use The array() function defines an array, the syntax is "$array variable name=array(key 1=> value 1, key 2 => value 2,..., key N=> value N);"; 3. Use Array literal "[]" defines an array, and the syntax is "$array variable name=[key 1=> value 1, key 2 => value 2,..., key N=> value N];".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php can define arrays. PHP provides a variety of methods to define and initialize arrays.

Method 1. Directly assign values ​​to array elements

We can use the form "$Array variable name [subscript] = Value;" format to create and initialize the array

The subscript can be a string, an integer, or empty (that is, no specific index value is specified).

<?php
header("Content-type:text/html;charset=utf-8");
$array[0] = &#39;欢迎&#39;;
$array[1] = &#39;来到&#39;;
$array[2] = &#39;PHP中文网&#39;;
$array[&#39;url&#39;] = &#39;https://www.php.cn/&#39;;
//输出语句
var_dump($array);
?>

The subscript can be omitted. When we do not specify a specific index value within square brackets, the default is a numeric index, and the index value starts from 0 and increases by default.

<?php
header("Content-type:text/html;charset=utf-8");
$array[] = &#39;香蕉&#39;;
$array[] = &#39;苹果&#39;;
$array[] = &#39;橘子&#39;;
$array[] = &#39;榴莲&#39;;
//输出语句
var_dump($array);
?>

Output result:

Method 2. Use array() function

## The #array() function is used to create arrays.

Direct array() function, without adding any parameters, can create an empty array

<?php
$array = array();
//输出语句
var_dump($array);
?>

array() function accepts a certain number of value parameters separated by commas .

<?php
header("Content-type:text/html;charset=utf-8");
$array= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
//输出语句
var_dump($array);
?>

array() function also accepts a certain number of

key=>value parameter pairs separated by commas.

<?php
header("Content-type:text/html;charset=utf-8");
$array=array(1=>"1","a"=>"",2=>"2","b"=>0,"c"=>"blue");
//输出语句
var_dump($array);
?>

Method 3: Use array literal "[]" to define the array

Array literal (Array Literals) is a comma-separated list containing one or more expressions, enclosed in square brackets ([…]).

It accepts a certain number of comma-separated

key=>value parameter pairs. The syntax format is as follows:

$数组变量名 = [key1 => value1, key2 => value2, ..., keyN => valueN];

The sample code is as follows:

<?php
header("Content-type:text/html;charset=utf-8");
$array = [1=>"1","a"=>"",2=>"2","b"=>0,"c"=>"blue"];
var_dump($array);
?>

If you do not use the

=> symbol to specify the subscript, The default is an indexed array. The default index value also starts from 0 and increases in sequence. The sample code is as follows:

<?php
header("Content-type:text/html;charset=utf-8");
$array = ["香蕉","苹果","梨子","橙子","橘子","榴莲"];
var_dump($array);
?>

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