1. The concept of arrays
An array is a named range that is used to store a series of variable values.
Each array element has an associated index (also a keyword) that can be used to access elements.
PHP allows you to use numbers or strings evenly
basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Gets the value of the array Array_keys ($arr), gets the key name of the array array_flip ($arr), and the values in the array are exchanged with the key
Arrays in PHP are actually an ordered ING. Valuing is a type that associates values with keys. This type has been optimized in many aspects, so it can be treated as a real array, or a list (vector), a hash list (an implementation of ing ), the array
Some php array learning notes. There are three types of php arrays: a numeric array with a numeric ID key, and an ID key in an array associated with a value multi-dimensional array containing one or more arrays, there are three types of php arrays:
Basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Get the value of an arrayArray_keys ($arr); Gets the key name of the arrayArray_flip ($arr); the values in the array are exchanged with the key names (if
Php array usage. 1. what is an array is a set of data, which organizes a series of data to form an operable whole. Each object in the array contains two items: Key and value. II. I. What is an array?
An array is a collection of data. it organizes a
Why does the order change when json_encode is output to the front end after the php array is sorted? This is the sorted array written to the file using the file_put_contents function. The order is correct. This is the data output to the foreground
The process of learning PHP, sorting out some of the commonly used functions, which are array functions.
Array (): Generate an array$a = Array ("Dog", "cat", "horse");Print_r ($a); Array ( = dog  = cat  = = horse)Array_combine ():
1. What is an array?An array is a collection of data. It organizes a series of data to form an operable whole. Each object in the array contains two items: Key and value.Ii. Declare dataThere are two ways to declare arrays in PHP:First, apply the
Is_array(PHP 4, PHP 5, PHP 7)is_array- Detecting If a variable is an arrayIs_array Mixed $var )If var it is an array, TRUE It is returned FALSE , otherwise.
Explode(PHP 4, PHP 5, PHP 7)explode- using one string to split another stringArray
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