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In this article Xiaobian for you to introduce in detail "what are the characteristics of php array", the content is detailed, the steps are clear, the details are handled properly, I hope this article "what are the characteristics of php array" can help you solve your doubts, the following follows the editor's ideas slowly in depth, let's learn new knowledge.

Php array features: 1, the key value can be any type of data, such as numbers, strings, arrays, etc.; 2, the key name can be a number (the default from 0), can also be a string or string with numbers mixed; 3, array elements with the entire array name and its subscript in the array to represent, syntax "array name [subscript]"; 4, the array length is variable.

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

An array is a collection of data that organizes a series of data to form an operable whole.

In PHP, the array 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 known as a subscript).

Array is one of the most important data types in PHP, and it is widely used in PHP. Because PHP is a programming language with weak data types, array variables in PHP can store any number of data, any type of data, and can realize the functions of data structures such as heap, stack, queue and so on in other strong data types.

The purpose of using arrays is to organize multiple interrelated data together to form a collection, which can be used as a unit to achieve the purpose of batch data processing.

What are the characteristics of php array

PHP's array is a very powerful and flexible data type. Here are some of the features of the PHP array:

1. The key value can be any type of data

Key values can be numbers, strings, Boolean values, null, etc., or even array types

2. The key name can be a number or a string

In the above example, the key name of the array is a number, but in fact, the key name can also be a manually set string.

PHP arrays are more flexible than arrays in other high-level languages, supporting not only indexed arrays with numbers as key names, but also associative arrays with strings or strings and mixed numbers as key names.

1) indexed array-numeric key name

The subscript (key name) of an indexed array consists of numbers. By default, starting from 0, each number corresponds to the position of an array element in the array, which does not need to be specified. PHP automatically assigns an integer value to the key name of the indexed array, and then increments automatically from this value. As follows:

$arr=array (1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

2) associative array-- string key name

The subscript (key name) of an associative array consists of a mixture of numeric values and strings, and if an array has a key name that is not a number, then the array is an associative array. As follows:

Arr=array ("id" = > 1, "name" = > "Li Hua", "age" = > 23, "1" = > 1, "id2" = > 52)

3. The array can be read sequentially using loop statements.

Foreach ($arr as $key = > $value) {echo $arr [$key]. "

";}

4. You can read the specified elements in the array according to the key name (subscript)

The array element is represented by the name of the entire array and its own subscript in the array.

$arr = [1 = > 'ok',' one' = > 'hello',' a'= > 'world']; echo $arr [' one']

5. The length of the array is variable

$arr = [1, 2, 3]; $arr [] = 4 position arrayed push ($arr, 5)

Based on these features, we can easily implement a variety of data structures such as sets, stacks, lists, dictionaries, and so on, using arrays in PHP.

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