How to store data in php array

In PHP, array is a very basic and important data type that can be used to store a set of related data. In development, we often need to define arrays to save some data. Let's take a look at how PHP arrays store data.

1. Define Array

Defining an array in PHP is very simple. You can use the array() function or square brackets [].

array() function

$arr = array('apple', 'banana', 'orange');

Square brackets[]

$arr = ['apple', 'banana', 'orange'];

Arrays defined in these two ways are equivalent.

2. Storing array elements

After defining the array, we can use key-value pairs to store array elements. Each element in the array has a key and a value, and we can access the corresponding value based on the key. In PHP, keys can be integers or strings, and values ​​can be of any data type, such as strings, integers, booleans, floats, objects, etc.

Use square brackets [] to store elements

$arr = ['apple', 'banana', 'orange'];
$arr[0] = 'pear';         // 将数组中下标为0的元素修改为'pear'
$arr[3] = 'grape';        // 向数组中添加元素'grape'，下标为3

Use the array() function to store elements

$arr = array('fruit1' => 'apple', 'fruit2' => 'banana');
$arr['fruit1'] = 'pear';        // 将数组中键名为'fruit1'的元素修改为'pear'
$arr['fruit3'] = 'orange';      // 向数组中添加元素'orange'，键名为'fruit3'

3. Multidimensional array

If you need to store more complex data, you can use multidimensional arrays. A multidimensional array means that the elements in the array are also arrays, and multiple keys can be used to access the elements in a multidimensional array.

Use square brackets [] to store multi-dimensional array elements

$arr = array(
  array('apple', 'pear', 'orange'),    // 第一个元素是一个数组，包含三个元素
  array('banana', 'grape'),            // 第二个元素是一个数组，包含两个元素
);
echo $arr[0][0];        // 访问数组中第一个元素的第一个元素

Use the array() function to store multi-dimensional array elements

$arr = array(
  'fruit1' => array('name' => 'apple', 'price' => 2.5),
  'fruit2' => array('name' => 'banana', 'price' => 1.5),
);
echo $arr['fruit1']['name'];        // 访问数组中键名为'fruit1'的元素的'name'键对应的值

The above are some simple ways to store data in PHP arrays introduce. In actual development, we can freely combine arrays and key-value pairs to store and process data as needed.

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