php - 可以在 PHP 中将函数作为参数传递吗？

Question

我想使用 PHP 将函数作为参数传递，就像 jQuery 允许传递函数一样。

jQuery：

$("#foo").bind("click", function(){

    alert("Hello world!");
});

因此，我使用 PHP 进行了尝试：

$arg1 = "Hello";
$arg2 = function($name){echo $name;};

function call_me($func_arg1="", $func_arg2=""){

    echo $func_arg1." ".$func_arg2("world!");
}

call_me($arg1, $arg2);

...但我得到“world！Hello”返回......为什么它会向后返回结果？

Answer 1

ok, I found the answer. It was because I was trying to echo an echo! I changed it so that:

$arg2 = function($name){return $name;};

This output "Hello world!" as expected.

Answer 2

Change this line

$arg2 = function($name){return $name;};