Example analysis of indexed array and associative array in php

This article mainly introduces the example analysis of indexed array and associative array in php, which has a certain reference value, and interested friends can refer to it. I hope you can learn a lot after reading this article.

Indexed array and associative array

PHP supports two kinds of arrays, one is an indexed array (indexed array) that holds only "value", and the other is an associative array (associative array) that holds a "name-value pair" (name/value).

Because javascript does not support associative arrays, json_encode () only converts indexed arrays (indexed array) to array format and associative arrays (associative array) to object format.

For example, there is now an indexed array

$arr = Array ('one',' two', 'three'); echo json_encode ($arr)

The result is:

["one", "two", "three"]

If you change it to an associative array:

$arr = Array ('1percent = >' one', '2percent = >' two', '3percent = >' three'); echo json_encode ($arr)

The result has changed:

{"1": "one", "2": "two", "3": "three"}

Notice that the data format has changed from "[]" (array) to "{}" (object).

If you need to force an indexed array into an object, you can write

Json_encode ((object) $arr)

Or

Json_encode ($arr, JSON_FORCE_OBJECT); Thank you for reading this article carefully. I hope the article "sample Analysis of indexed arrays and associative arrays in php" shared by the editor will be helpful to you. At the same time, I also hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!