使用包含变量名称的字符串访问数组值，后跟方括号键路径

Question

如何解析数组字符串以便获取变量的值

示例字符串

$str = 'prices[holiday:waterpark][person:1_person]';

样本变量

$prices['holiday:waterpark']['person:1_person'] = 100;

我尝试过在 php 中使用变量.variable 方式，如下所示

$prices['holiday:waterpark']['person:1_person'] = 100;
$str = "prices\['holiday:waterpark'\]\['person:1_person'\]";
$str = str_replace('\\', '', $str);
echo $$str;

但这不起作用，我收到错误

"Undefined variable: $prices['holiday:waterpark']['person:1_person']"

Answer 1

试试这个

<?
    $prices['holiday:waterpark']['person:1_person'] = 100;
    $str = "prices\['holiday:waterpark'\]\['person:1_person'\]";
    $str = stripslashes($str);
    // be careful with passing $str from untrusted source
    // make necessary variable filtering before!
    echo eval('return $' . $str . ';');