How to declare global variables in php

In PHP, declaring global variables is a common requirement. Global variables can be accessed from anywhere in the program, but need to be used with care to avoid potential problems. PHP editor Yuzai introduces you how to declare global variables in PHP, including using global keywords and the $GLOBALS array. Mastering the correct method of declaring global variables will help improve the maintainability and flexibility of your code, making your PHP program more efficient and easier to manage.

The following are examples of declaring and using global variables:

<?php
// 声明全局变量
global $name;
$name = "John Doe";

function printName() {
// 访问全局变量
global $name;
echo $name;
}

printName(); // 输出 "John Doe"
?>

Please note that if a variable is declared without using the global keyword inside a function, the variable will be considered a local variable, not a global variable.

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