php - 如何将对象包含的文件路径中的代码运行到对象外部的函数范围内？

Question

我目前正在将代码从页面解析器函数重构为 OOP。 我在将文件中的代码包含并运行到主函数范围中时遇到困难:

对象:

class phpFragment {
    private $sData;

    function render() {
        return include $oElement->sData;
    }
}

对象容器类:

class pageData {
    protected $aPhpFragments;
    protected $aCssFragments;

    public function outputData($sTag) {
        switch($sTag) {
            case 'php':
                foreach($this->aPhpFragments as $oPhpFragment) {
                    return $oPhpFragment->render();
                }
                break;
            case 'css':
                foreach($this->aCssFragments as $oCssFragment) {
                    echo $oCssFragment->render();
                }
                break;
        }
    }
}

主要功能:

function parsePage($sLanguageCode) {
    $oTranslator = new translator($sLanguageCode);
    $aTranslations = $oTranslator->translations('page');
    $oBuilderClass = new builder($aTranslations);

    //... queries to get data and set pagedata and get the template file
    $oPageData = $oPage->getData();
    $aTemplateTags = $oTemplate->getTags(); 
    foreach($aTemplateTags as $sTag) {
       $oPageData->outputData($sTag);
    }

    //....   
}

包含代码(示例):

<?php

$oBuilderClass->build_element(.... parameters here);

?>

我只想启动构建器类一次，因为它包含相当多的数据，并且我不想在每次包含时重新创建它。

如何将包含的代码返回到可以使用 builderClass 的 parsePage 函数中？

Answer 1

您可以创建一个 Context 类，它将作为范围变量的容器，并帮助您在上下文中包含(执行)代码。它将是一个单例类(仅创建一个实例)。

使用方法如下:current()方法返回当前实例，然后您可以使用export()方法将变量导出到上下文，它接受一个键/值数组。方法 execute() 将文件名作为参数，并将其与可用的导出变量一起包含在内，您可以添加临时变量作为第二个参数:

//Somewhere before execute();
oContext::current()->export([
    'variable1' => 'value1',
    'instance' => $instance
]);

//Then anywhere in your file:
oContext::current()->execute("toBeIncluded.php", [
    'tmp_variable' => 'tmp_value'
]);

//toBeIncluded.php
echo $variable1;
echo $instance->method1();
echo $tmp_variable;

---

就您而言:

主要功能:

function parsePage($sLanguageCode) {
    $oTranslator = new translator($sLanguageCode);
    $aTranslations = $oTranslator->translations('page');
    $oBuilderClass = new builder($aTranslations);

    //export variables to your context
    //Don't be aware of memroy usage objects are passed by reference
    oContext::current()->export(compact('oBuilderClass'));

    //... queries to get data and set pagedata and get the template file
    $oPageData = $oPage->getData();
    $aTemplateTags = $oTemplate->getTags(); 
    foreach($aTemplateTags as $sTag) {
            $oPageData->outputData($sTag);
    }

    //....   
}

对象:

class phpFragment {
    private $sData;

    function render() {
        oContext::current()->execute($oElement->sData);
    }
}

---

您可以在下面找到类声明:

oContext.class.php

/**
 * Class oContext
 */
class oContext {

    /**
     * The singleton instance
     * @var oContext
     */
    private static $instance = null;

    /**
     * the exported variables
     * @var array
     */
    private $variables = [];

    /**
     * Return the singleton or create one if does not exist
     *
     * @return oContext
     */
    public static function current() {
        if (!self::$instance) {
            self::$instance = new self;
        }
        return self::$instance;
    }

    /**
     * Export an array of key/value variables
     *
     * @param $variables
     * @return $this
     */
    public function export($variables) {
        foreach ($variables as $key => $value) {
            $this->variables[$key] = $value;
        }
        return $this;
    }

    /**
     * Include and execute a file in this context
     *
     * @param $file
     * @param array $variables temporary exports will not be added to the context (not available in the next call)
     * @return $this
     */
    public function execute($file, $variables = []) {
        //Populate variables
        foreach (array_merge($this->variables, $variables) as $key => $value) {
            ${$key} = $value;
        }
        include $file;
        return $this;
    }

}

我希望这可以帮助您实现目标。

祝你好运。