相关疑难解决方法(0)

function foo () {
    global $var;
    // rest of code
}

在我的小PHP项目中,我通常采用程序方式.我通常有一个包含系统配置的变量,当我需要在函数中访问此变量时,我会这样做global $var;.

这是不好的做法吗？

从php singleton类下面

<?php
class Singleton
{
    /**
     * @var Singleton The reference to *Singleton* instance of this class
     */
    private static $instance;

    /**
     * Returns the *Singleton* instance of this class.
     *
     * @return Singleton The *Singleton* instance.
     */
    public static function getInstance()
    {
        if (null === static::$instance) {
            static::$instance = new static();
        }

        return static::$instance;
    }

    /**
     * Protected constructor to prevent creating a new instance of the
     * *Singleton* via the `new` operator from outside of this class. …