What does the php array concept mean?

php's array concept is an array in PHP. Its characteristic is to map values ​​to the type of keys. Unlike other languages, the keys of arrays in PHP can be strings, and the values ​​can be of any type. Arrays in PHP are more complex but more flexible than arrays in many other high-level languages.

The operating environment of this tutorial: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

php array, as the name suggests, is an array in PHP. Its characteristic is to map values ​​to the type of keys. Unlike other languages, the keys of arrays in PHP can be strings, and the values ​​can be of any type.

For example:

php
array(boo=>true,1=>13,12=>PHP,fl=>6.46);

PHP also provides many functions related to array operations.

What is an array

An array is a collection of data that organizes a series of data to form an operable whole. Arrays in PHP are more complex but more flexible than arrays in many other high-level languages.

Array An array is an ordered set of variables, where each value is called an element. Each element is distinguished by a special identifier called a key (also called a subscript).

Each entity in the array contains two items, namely key and value. The corresponding array elements can be obtained by key value. These keys can be numeric keys or association keys. If a variable is a container that stores a single value, then an array is a container that stores multiple values.

PHP arrays are more flexible than arrays in other high-level languages. They not only support index arrays with numbers as keys, but also support associative arrays with strings or a mixture of strings and numbers as keys. In other high-level languages, such as Java or C, only numerically indexed arrays are supported.

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