集中 php 全局变量？

Question

我有一个 functions.php 文件，其中包括以下功能：

function head() {
    global $brand, $brandName, $logo, $slogan, $siteName, $title, $titles, $keyword, $keywords, $description, $descriptions, $bodyclass, $bodyClass, $page;
    include('_assets/inc/head.php');
}

function foot() {
    global $brand, $brandName, $logo, $slogan, $siteName, $title, $titles, $keyword, $keywords, $description, $descriptions, $bodyclass, $bodyClass, $page;
    include('_assets/inc/foot.php');
}

我需要将 globals 行复制到 foot() 以获取我在 foot.php 中调用的变量以显示。难道我没有一个地方可以集中这些全局变量，所以我只需要在我的站点中放置一次全局行吗？

---

按照杰克的指示，我现在有：

class Page {
    private $context;
    public function __construct(array $context) {
        $this->context = $context;
    }
    public function printHead() {
        extract($this->context);
        include '_assets/inc/head.php';
    }
    public function printFoot() {
        extract($this->context);
        include '_assets/inc/foot.php';
    }
}
$page = new Page(array(
    'brand' => 'myBrand',
    'brandName' => '<span class="brand">'.$brand.' <sup><span aria-hidden="true" class="icon_search"></span></sup></span>',
    'logo' => '<a href="/" class="brand">'.$brandName.'</a>',
    'slogan' => '<span class="slogan">Find A Real Estate Professional</span>',
    'siteName' => $logo.' | Directory of Real Estate Professionals',
    'title' => 'Directory of Real Estate Professionals | '.$brand.'',
    'titles' => array (
        'home' => 'Find A Real Estate Professional | '.$brand.''
    );
        if(isset($titles[$page])){
            $title = $titles[$page];
        }
    'keyword' => ''.$brand.', real estate professionals, real estate directory, real estate agents, realtor directory, real estate brokers, real estate lawyers, real estate insurance agents, real estate appraisers, real estate staging consultants',
    'keywords' => array (
        '' => ''
    );
        if(isset($keywords[$page])){
            $keyword = $keywords[$page];
        }
    'description' => ''.$brand.' is a complete directory of real estate professionals, including agents, brokers, appraisers, insurance agents, stagers, lawyers, and more.',
    'descriptions' => array (
        '' => ''
    );
        if(isset($descriptions[$page])){
            $description = $descriptions[$page];
        }
    'bodyclass' => ' page bbfix',
    'bodyClass' => array (
        'home' => 'home'
    ); 
        if(isset($bodyClass[$page])){
            $bodyclass = $bodyClass[$page];
        }
    'page' => $page
));
$page->printHead();
$page->printFoot();

但是，我的代码存在与数组相关的错误。 :(

Answer 1

是的，PHP 中有一个对所有全局变量的集中引用。它叫做the $GLOBALS array。

一个关联数组，包含对当前在脚本全局范围内定义的所有变量的引用。变量名是数组的键。

例如：

$GLOBALS['brand'];
$GLOBALS['logo'];
 // And so on

Answer 2

请不要跳到像global 和同样糟糕的$GLOBALS 这样的结构；具有全局状态是not recommended。

也就是说，通过一些小改动，您可以通过使用对象来封装您的状态来改进您的设计：

class Page
{
    private $context;

    public function __construct(array $context)
    {
        $this->context = $context;
    }

    public function printHead()
    {
        extract($this->context);
        include '_assets/inc/head.php';
    }

    // same for foot()
}

使用它：

$page = new Page(array(
    'brand' => 'foo',
    'brandName' => 'bar',
    // etc
));

$page->printHead();

Page 类在构造时封装了上下文；此状态是在您的资产被包含到脚本之前提取的。对于包含的脚本来说，就好像变量一直都是全局的。