我正在使用以下类来模拟 PHP 中的匿名对象:
class AnonymousObject
{
protected $methods = array();
public function __construct(array $options) {
$this->methods = $options;
}
public function __call($name, $arguments) {
$callable = null;
if (array_key_exists($name, $this->methods))
$callable = $this->methods[$name];
elseif(isset($this->$name))
$callable = $this->$name;
if (!is_callable($callable))
throw new BadMethodCallException("Method {$name} does not exist");
return call_user_func_array($callable, $arguments);
}
}
( https://gist.github.com/Mihailoff/3700483 )
现在,只要声明的函数独立存在,一切正常,但每当我尝试像这样从另一个函数调用一个函数时......
$anonymous = new AnonymousObject(array(
"foo" => function() { $this->bar(); },
"bar" => function() { }
));
当然我会得到 Fatal error: Using $this when not in object context
有什么办法可以解决这个问题吗?
最佳答案
您可以使用 bind() 或 bindTo() method代表匿名函数的 Closure 实例。
<?php
class AnonymousObject
{
protected $methods = array();
public function __construct(array $options) {
$this->methods = $options;
}
public function __call($name, $arguments) {
$callable = null;
if (array_key_exists($name, $this->methods))
$callable = $this->methods[$name];
elseif(isset($this->$name))
$callable = $this->$name;
if (!is_callable($callable))
throw new BadMethodCallException("Method {$name} does not exists");
$callable = $callable->bindTo($this);
return call_user_func_array($callable, $arguments);
}
}
$anonymous = new AnonymousObject(array(
"foo" => function() { echo 'foo'; $this->bar(); },
"bar" => function() { echo 'bar'; }
));
$anonymous->foo();
(示例不太正确,因为它只适用于匿名函数;不适用于所有其他 callable() 替代方案,例如 $this->name 部分)
打印foobar
。
关于php - 在 "anonymous"对象中使用 $this,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31367735/