There are several ways to define arrays in php

There are four ways to define an array in php: 1. Numeric index array, using integers as array subscripts, and storing each element in a sequential numbering manner; 2. Associative arrays, using strings as array subscripts Mark, store each element in the form of one-to-one correspondence between name and value; 3. Fixed-length numeric index array supported starting from PHP 7.4; 4. Use the list() function to deconstruct the array into multiple variables.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

PHP There are 4 ways to define arrays:

1. Numeric index array: use integers as array subscripts and store each element in a sequential numbering manner.

$names = array('John', 'Jane', 'Jim');
// 或者在PHP 5.4及以上版本中可以简写成
$names = ['John', 'Jane', 'Jim'];

2. Associative array: Use strings as array subscripts to store each element in a one-to-one correspondence between name and value.

$info = array(
    'name' => 'John',
    'age' => 30,
    'location' => 'New York'
);
// 或者在PHP 5.4及以上版本中可以简写成
$info = [
    'name' => 'John',
    'age' => 30,
    'location' => 'New York'
];

Note that arrays can also be defined in the following ways in PHP:

3. Fixed-length numeric index arrays supported starting from PHP version 7.4 (these arrays cannot add or delete elements, just Like a read-only constant):

$scores = [10, 20, 30]; // 这是一个长度为 3 的数组
$scores[] = 40;         // 这里会导致 Fatal error，因为数组长度不可修改

4. Use the list() function to deconstruct the array into multiple variables:

$info = array('John', 30, 'New York');
list($name, $age, $location) = $info;
echo $name;      // 输出 'John'
echo $age;       // 输出 30
echo $location;  // 输出 'New York'

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