Global array意思

"Global array" is a term used in computer programming, particularly in the context of scripting languages like PHP, JavaScript, or Python. An array is a data structure that can hold a fixed-size sequential collection of elements of the same type. A global array is an array that is declared globally, meaning it is accessible to all functions and code throughout the entire script or program, without the need for it to be passed as an argument or explicitly declared in a local scope.

Here's an example of a global array in PHP:

<?php
// Declare a global array
$global_array = array('a' => 1, 'b' => 2, 'c' => 3);

function displayArray() {
    // Access the global array
    echo $global_array['a']; // Outputs 1
    echo $global_array['b']; // Outputs 2
    echo $global_array['c']; // Outputs 3
}

displayArray();

In this example, the $global_array is defined at the top level of the script, making it a global variable. The displayArray function can access and manipulate the elements of the global array without any additional steps.

In some programming languages, global arrays may also refer to arrays that are shared across different processes or applications, but this typically requires special mechanisms like inter-process communication (IPC) or shared memory.