函数作为数组值 [英] Function as array value

问题描述

我似乎无法找到这样的东西，并且想知道是否有可能存储函数或函数引用作为一个数组元素的值。对于如

I can't seem to find anything of this, and was wondering if it's possible to store a function or function reference as a value for an array element. For e.g.

array("someFunc" => &x(), "anotherFunc" => $this->anotherFunc())

谢谢！

推荐答案

您可以在引用任何功能。函数引用不是在内存地址或其他意义上的参考。它只是函数的名称

You can "reference" any function. A function reference is not a reference in the sense of "address in memory" or something. It's merely the name of the function.

<?php

$functions = array(
  'regular' => 'strlen',
  'class_function' => array('ClassName', 'functionName'),
  'object_method' => array($object, 'methodName'),
  'closure' => function($foo) {
    return $foo;
  },
);

// while this works
$functions['regular']();
// this doesn't
$functions['class_function']();

// to make this work across the board, you'll need either
call_user_func($functions['object_method'], $arg1, $arg2, $arg3);
// or
call_user_func_array($functions['object_method'], array($arg1, $arg2, $arg3));

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