php 函数作为数组值
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Function as array value
提问by user784446
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.
我似乎找不到任何内容，并且想知道是否可以将函数或函数引用存储为数组元素的值。例如
array("someFunc" => &x(), "anotherFunc" => $this->anotherFunc())
Thanks!
谢谢！
回答by rodneyrehm
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.
您可以“引用”任何函数。函数引用不是“内存中的地址”等意义上的引用。它只是函数的名称。
<?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, $arg3));
回答by Paulo Rodrigues
回答by Ibrahim Azhar Armar
check out PHP's call_user_func. consider the below example.
查看 PHP 的call_user_func. 考虑下面的例子。
consider two functions
考虑两个函数
function a($param)
{
return $param;
}
function b($param)
{
return $param;
}
$array = array('a' => 'first function param', 'b' => 'second function param');
now if you want to execute all the function in a sequence you can do it with a loop.
现在，如果您想按顺序执行所有功能，您可以使用循环来完成。
foreach($array as $functionName => $param) {
call_user_func($functioName, $param);
}
plus array can hold any data type, be it function call, nested arrays, object, string, integer etc. etc.
plus 数组可以保存任何数据类型，可以是函数调用、嵌套数组、对象、字符串、整数等。
回答by Treffynnon
Yes, you can:
是的你可以：
$array = array(
'func' => function($var) { return $var * 2; },
);
var_dump($array['func'](2));
This does, of course, require PHP anonymous functionsupport, which arrived with PHP version 5.3.0. This is going to leave you with quite unreadable code though.
当然，这确实需要 PHP匿名函数支持，该支持随 PHP 5.3.0 版一起提供。但是，这会给您留下非常不可读的代码。
