将字符串评估为PHP代码? [英] Evaluate a string as PHP code?

问题描述

我有一个想让PHP阅读的字符串作为一段代码.原因是我想提前为PHP构建指令集，然后在以后执行它.目前，我有:

I have a string that I want to have PHP read as a piece of code. The reason is that I want to build the set of instructions for PHP in advance, and then execute it later on. Currently I have:

$string = '$this->model_db->get_results()';

期望的结果是:

$string2 = $this->model_db->get_results();

推荐答案

您可以具有可变的变量/函数，但不能具有可变的方法链.但是，您可以使用变量/函数来创建方法链.

you can have a variable variable/function, but cannot have variable method chains. you can however create a method chain using variable variables/functions.

检查php文档的以下页面: http://php.net/manual/en/language.variables.variable.php

Check this page of the php documentation: http://php.net/manual/en/language.variables.variable.php

它显示了使用字符串作为对象或方法名称的用法.使用eval可能会导致安全漏洞，具体取决于数据的来源.

it shows the usage of using strings as object or method names. using eval may lead to security vulnerabilities depending on the source of your data.

$var1 = 'model_db';
$var2 = 'get_results';

$this->$var1->$var2();

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