What are the types of php arrays?

PHP is a scripting language that has many basic data types, including Integer, Float, Boolean, String, Array, etc. The array type is a very important data type in PHP. It can combine multiple related data and make it easy to process and access.

In PHP, array types can be divided into the following types:

1. Index array: Index array is the simplest array type, each of its elements is represented by Identified by a numeric index. When creating an indexed array, you can use the array() function or the [] notation to define the array.

For example, both of the following statements create an indexed array of three integers:

$arr = array(1, 2, 3);
$arr = [1, 2, 3];

2. Associative arrays: Associative arrays are also called hashes in PHP A table or dictionary whose each element is identified by a string index. When creating an associative array, you can use the array() function or the [] symbol to define the array, and you need to specify a string index for each element.

For example, both of the following statements can create an associative array containing three elements:

$arr = array("name" => "Tom", "age" => 18, "city" => "New York");
$arr = ["name" => "Tom", "age" => 18, "city" => "New York"];

3. Multidimensional array: A multidimensional array is an array that contains other arrays as An array of elements, that is, each element is an array. For example, a two-dimensional array containing multiple student information, where each student information is an array containing multiple elements such as name, age, grades, etc.

The following is an example of a two-dimensional array:

$arr = array(
    array("name" => "Tom", "age" => 18, "score" => 80),
    array("name" => "Jerry", "age" => 20, "score" => 90),
    array("name" => "Alice", "age" => 19, "score" => 85)
);

4. Other types of arrays: In addition to the above three commonly used array types, PHP also provides some special Array type, for example:

• Serialized array: refers to serializing PHP arrays into string form for easy storage and transmission.
• JSON array: refers to converting PHP arrays into JSON format to facilitate interaction and data sharing with other systems.
• Object array: refers to storing PHP objects in an array to facilitate batch processing and operations.

The array type is one of the most commonly used data types in PHP. It is very important for PHP developers to be proficient in the various usages and details of array types. The above are the four common types of PHP array types. Readers can choose different types of arrays for development according to their own needs.

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