PHP将变量传递给array_walk_recursive

Question

此代码有效，但 $vars 无法在 call() 函数中定义。 为什么$vars不能传给array_walk_recursive()？

class lib{

    private $library;

    function __construct($lib="")
    {
        $this->library = $lib;
    }
    function set($vars)
    {
        $decoded_classes = json_decode($this->library,true);
        array_walk_recursive($decoded_classes,function(&$f) {$f = create_function($vars,$f);});
        return $decoded_classes;
    }
}
$json = '
{     
    "class1": {     
        "function1":"return \"$a<b>$b</b>!\";"
    },
    "class2": {     
        "function2":"return $b;",
        "function3":"return $c;"
    },
    "function1":"return \"test\";"
}';
$lib = new lib($json);
$lib = $lib->set("$a,$b");
$lib = $lib["class1"]["function1"]("asdasasd","asdasasd");
echo $lib;

Answer 1

首先，看看this example with variable scoping for closures。您需要使用use 关键字传入变量，例如：

array_walk_recursive($decoded_classes,function(&$f) use ($vars) {$f = create_function($vars,$f);});

如果您为我们定义了$a、$b 等，那就太好了，这样我们就可以实际测试您的代码了。