Which symbol in php can declare an array

The "[]" symbol in php can declare an array. Two declaration methods: 1. Use the "$array variable name = [element value]" statement. "[]" can contain multiple value lists, separated by commas. If the value list is omitted, an empty array is declared; 2 , use "$array variable name [subscript] = value" to directly declare the array and assign a value to the specified subscript element.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

"[ in php ]" symbol can declare an array.

In PHP, square brackets "[]" are also called "array literals". There are two ways to use them to declare an array.

Method 1. Use “$array variable name=[element value]”

"[]" does not contain a value, then an empty array is defined:

<?php
header("Content-type:text/html;charset=utf-8");
$arr=[];
var_dump($arr);
?>

"[]" can also contain multiple value lists, with commas between values Separate;

<?php
header("Content-type:text/html;charset=utf-8");
$arr=[1,2,3,4,5];
var_dump($arr);
?>

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

##Method 2, use "$array Variable name [subscript] = value ”

This method can directly declare an array and assign a value to the specified subscript element.

The subscript (index value) can be a string or an integer, and the subscript needs to be wrapped with

[ ].

Example 1:

<?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);
?>

Output result:

Example 2:

<?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:

It can be seen that when we do not specify a specific index value within square brackets, the default is a numeric index, and the index value increases sequentially starting from 0 by default.

Recommended learning: "

PHP Video Tutorial"

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