php globals_PHP $ GLOBALS（超级全局变量），带有示例

php globals

PHP $全球 (PHP $GLOBALS)

PHP $GLOBALS is the only superglobal that does not begin with an underscore (_). It is an array that stores all the global scope variables.

PHP $ GLOBALS是唯一不以下划线( _ )开头的超全局变量。它是一个存储所有全局范围变量的数组。

$GLOBALS in PHP is used to access all global variables (variables from global scope) i.e. the variable that can be accessed from any scope in a PHP script.

PHP中的$ GLOBALS用于访问所有全局变量(来自全局范围的变量)，即可以从PHP脚本中的任何范围访问的变量。

Example of $GLOBALS in PHP

PHP中的$ GLOBALS的示例

We will see how to access a variable defined globally with the $GLOBALS superglobal?

我们将看到如何使用$ GLOBALS superglobal访问全局定义的变量？

PHP代码演示$ GLOBALS示例 (PHP code to demonstrate example of $GLOBALS)

<?php
//global variable
$name = 'my name is sam';
//function
function sayName() {
echo $GLOBALS['name'];
}
//calling the function
sayName();
?>

Output

输出量

my name is sam

By defining the $name variable it automatically is stored in the superglobal variable $GLOBALS array. This explains why we can access it in the sayName() function without defining it in the function.

通过定义$ name变量，它会自动存储在超全局变量$ GLOBALS数组中。这就解释了为什么我们可以在sayName()函数中访问它而无需在函数中定义它的原因。

PHP代码通过使用$ GLOBALS访问全局变量来查找两个数字的和 (PHP code to find sum of two numbers by accessing global variables using $GLOBALS)

<?php
//global variables
$num1 = 36;
$num2 = 24;
//function to access global variables
function add2Numbers() {
$GLOBALS['sum'] = $GLOBALS['num1'] + $GLOBALS['num2'];
}
//calling function
add2Numbers();
//printing sum using global variable
echo $sum;
?>

Output

输出量

In the code above, num1 and num2 are global variables so we are accessing them using $GLOBALS, and sum is a variable present within $GLOBALS, thus, it is accessible from outside the function also.

在上面的代码中， num1和num2是全局变量，因此我们使用$ GLOBALS访问它们，并且sum是$ GLOBALS中存在的变量，因此，也可以从函数外部对其进行访问。