PHP: 带有用户回调的函数

Question

我第一次尝试使函数重载主函数。所以需要一些指导来理解和以更好和未来证明的方式编写。

我正在创建此功能用于导航并允许开发人员overload/override主要功能。

主要功能

我不确定我是否以最有效的方式编写了这个函数。感谢您的指导，让它变得更好。

function main_func( $args, $callback = NULL )
{
$result[] = $args;
/*
 * This is just for example
 * So by calling user function below,
 * I want to allow developer to add additional functionality
 * Or can override condition before function returns the value
 */
if ( array_key_exists('page', $args) ) {
    // some stuffs based on condition
}

/*
 * I am not so sure about the placement of the call_user_func
 * As I believe this might be okay because I want to allow
 * developers to override above condition and manipulate $args
 * before this function returns the result
 */

/*
 * I am not so sure but probably something like this
 * $args[] = array_merge($args, call_user_func($callback, func_get_arg(func_num_args())));
 */
if ( is_callable($callback) ) {
    $result[] = call_user_func($callback, $args);
}

/*
 * Here I want to merge two array items
 * 1. Function's $args argument
 * 2. User callback function $args
 *
 * This means user will be able to add own array item within
 * the nested array item for $args
 *
 * So final result I am looking is
 *
 *   array(
 *      $args = array(), array(), ... // function args array items
 *      $args = array(), array(), ... // user callback function args array item
 *   );
 */

/*
 * So here I get combined array with
 * user own callbck function logic and
 * custom array items within the array
 */
return $result;
}

所以这里我想要的有或没有回调的最终结果是多维数组，如下例

Array
(
    [0] => Array
        (
            [auth] => 
            [url] => user-photos
            [label] => Social Photos
            [selected] => 1
        )

    [1] => Array
        (
            [auth] => 
            [url] => user-settings
            [label] => Social Settings
            [selected] => 0
        )

)

我能够实现上述结果，但不确定它是否正确有效并且是否足够安全。

所以这里有一些使用我所做的例子

// function args
$args = array(
    'auth'     => FALSE,
    'url'      => 'user-photos',
    'label'    => 'Social Photos',
    'selected' => 1
);

// this function result
main_func($args);

结果

// result
Array
(
    [0] => Array
        (
            [auth] => 
            [url] => user-photos
            [label] => Social Photos
            [selected] => 1
        )

)

使用回调

// callback args
$user_args = array(
    'auth'     => FALSE,
    'url'      => 'user-settings',
    'label'    => 'Social Settings',
    'selected' => 0
);

// function with user callback
main_func($args, function(){
    $user_args = array(
        'auth'     => FALSE,
        'url'      => 'user-settings',
        'label'    => 'Social Settings',
        'selected' => 0
    );
    return $user_args;
});

结果

// result
Array
(
    [0] => Array
        (
            [auth] => 
            [url] => user-photos
            [label] => Social Photos
            [selected] => 1
        )

    [1] => Array
        (
            [auth] => 
            [url] => user-settings
            [label] => Social Settings
            [selected] => 0
        )

)

看起来结果不错，正是我想要的。但是，我希望开发人员允许将函数名称（字符串）作为回调函数而不是匿名函数传递，但我不知道该怎么做。

像这样

// user callback function
function user_func($user_args)
{
    // do my stuffs

    if (some condition) {
        // do all stuffs
    }

    return stuffs;
}

// Now callbck user function by function name instead of anonymous function
main_func($args, 'user_func');

这就是我最终想要的

1. 使主要功能更高效和面向未来
2. 允许传递函数名称作为回调而不是匿名函数
3. 任何其他让它变得更好的技巧

万分感谢

Answer 1

如果你想让你的回调函数完全修改数组，你可以这样做：

$args = call_user_func($callback, $args);

并在通话中：

main_func($args, function ($args) {

    // examples
    $args[0]["selected"] = 0;
    $args[] = array("toto");

    // retun the modified array
    return $args;
});

重置数组的其他示例

main_func($args, function($user_args) {

    $user_args = array(
        'auth'     => FALSE,
        'url'      => 'user-settings',
        'label'    => 'Social Settings',
        'selected' => 0
    );

    return $user_args;
});

.

---

用函数名测试

function main_func($args, $callback = NULL) {

    if (is_callable($callback)) {
        $args = call_user_func($callback, $args);
    }

    return $args;
}

$args_test = array(
    array(
        "auth" => FALSE,
        "url" => "user-photos",
        "label" => "Social Photos",
        "selected" => 1,
    ),
);


function test_callback($t) {

    $t[0]["selected"] = 0;

    $t[] = array("toto");

    return $t;
}


// test with function name

$test1 = main_func($args_test, "test_callback");

var_dump($test1);


// test with anonymous function

$test2 = main_func($args_test, function ($a) {
    return test_callback($a);
});

var_dump($test2);


// test with no callback

$test3 = main_func($args_test);

var_dump($test3);