我可以通过 add_action 将参数传递给我的函数吗? [英] can I pass arguments to my function through add_action?

问题描述

我可以这样做吗?将参数传递给我的函数?我已经研究了 add_action doc 但不知道如何去做.传递两个参数的确切语法是什么样的.特别是如何传递 text &整数参数.

function recent_post_by_author($author,$number_of_posts) {一些命令；}add_action('thesis_hook_before_post','recent_post_by_author',10,'author,2')

更新

在我看来，它是通过 do_action 以某种方式完成的，但是怎么做?:-)

解决方案

我可以这样做吗?将参数传递给我的函数?

是的，你可以！诀窍在于您传递给 add_action 的函数类型以及您对 do_action.

• ‘my_function_name’
• 数组(实例，'instance_function_name')
• 'StaticClassName::a_function_on_static_class'
• 匿名
• 拉姆达
• 关闭

<小时>

我们可以通过闭包来做到这一点.

//钩子的自定义参数$args = 数组 ('作者' =>6,//id'posts_per_page'=>1,//最大帖子数);//订阅带有自定义参数的钩子add_action('thesis_hook_before_post',函数()使用( $args ){最近_post_by_author( $args );});//在某处触发钩子do_action('thesis_hook_before_post');//按作者呈现帖子图块列表函数最近_post_by_author($args){//与默认参数合并$args = wp_parse_args( $args, 数组 ('作者' =>-1,'orderby' =>'发布日期'，'订单' =>'ASC','posts_per_page'=>25));//拉取用户的帖子$user_posts = get_posts( $args );//一些命令echo '
';foreach ( $user_posts as $post ) {echo "<li>$post->post_title</li>";}回声'</ul>';}

<小时>

这是一个闭包工作的简化示例

$total = array();add_action('count_em_dude', function() use (&$total) { $total[] = count($total); } );do_action ('count_em_dude');do_action ('count_em_dude');do_action ('count_em_dude');do_action ('count_em_dude');do_action ('count_em_dude');do_action ('count_em_dude');do_action ('count_em_dude');回声内爆( ', ', $total );//0, 1, 2, 3, 4, 5, 6

<小时>

匿名与封闭

add_action ('custom_action', function(){ echo 'anonymous functions work without args!'; } );//add_action ('custom_action', function($a, $b, $c, $d){ echo '匿名函数有效，但默认参数 num 为 1，其余为空 - '; var_dump(array($a,$b,$c,$d)); } );//一种add_action ('custom_action', function($a, $b, $c, $d){ echo '如果您在优先级之后指定参数数量，匿名函数将起作用 - '; var_dump(array($a,$b,$c,$d)); }, 10, 4 );//A B C D//关闭$值 = 12345;add_action ('custom_action', function($a, $b, $c, $d) use ($value) { echo '闭包允许你包含值 - '; var_dump(array($a,$b,$c,$d, $value)); }, 10, 4 );//a,b,c,d, 12345//做吧！do_action('custom_action', 'aa', 'bb', 'cc', 'dd');

<小时>

代理函数类

class ProxyFunc {公共 $args = null;公共 $func = null;公共 $location = null;公共 $func_args = null;函数 __construct($func, $args, $location='after', $action='', $priority = 10, $accepted_args = 1) {$this->func = $func;$this->args = is_array($args) ?$args : 数组($args);$this->location = $location;如果(！空($动作)){//(可选)在构造函数中传递动作以自动订阅add_action($action, $this, $priority, $accepted_args );}}函数 __invoke() {//传递给调用的当前参数$this->func_args = func_get_args();//存储参数的位置开关($this->location){案例之后":$args = array_merge($this->func_args, $this->args);休息;案例之前":$args = array_merge($this->args, $this->func_args);休息;案例替换":$args = $this->args;休息;案例参考"://只传递对这个对象的引用$args = array($this);休息;默认://忽略存储的参数$args = $this->func_args;}//触发回调call_user_func_array( $this->func, $args );//清除当前参数$this->func_args = null;}}

示例用法 #1

$proxyFunc = new ProxyFunc(功能() {echo "
";打印_r(func_get_args());wp_die();},数组(1,2,3)，'之后');add_action('TestProxyFunc', $proxyFunc);do_action('TestProxyFunc', 'Hello World', 'Goodbye');//你好世界, 1, 2, 3
示例用法 #2
$proxyFunc = new ProxyFunc(功能() {echo "
";打印_r(func_get_args());wp_die();},//回调函数array(1,2,3),//存储的参数'after',//存储参数的位置'TestProxyFunc',//(可选)动作10,//(可选)优先级2//(可选)增加动作参数长度.);do_action('TestProxyFunc', 'Hello World', 'Goodbye');//你好世界，再见，1, 2, 3
can I do something like that? to pass arguments to my function? I already studied add_action doc but did not figure out how to do it. What the exact syntax to pass two arguments would look like. In particular how to pass text & integer arguments.
function recent_post_by_author($author,$number_of_posts) {
  some commands;
}
add_action('thesis_hook_before_post','recent_post_by_author',10,'author,2')
UPDATE

it seems to me that it is done somehow through do_action but how? :-)
解决方案

  
can I do something like that? to pass arguments to my function?
Yes you can! The trick really is in what type of function you pass to add_action and what you expect from do_action.


‘my_function_name’
array( instance, ‘instance_function_name’)
‘StaticClassName::a_function_on_static_class'
anonymous
lambda
closure




We can do it with a closure.
// custom args for hook

$args = array (
    'author'        =>  6, // id
    'posts_per_page'=>  1, // max posts
);

// subscribe to the hook w/custom args

add_action('thesis_hook_before_post', 
           function() use ( $args ) { 
               recent_post_by_author( $args ); });


// trigger the hook somewhere

do_action( 'thesis_hook_before_post' );


// renders a list of post tiles by author

function recent_post_by_author( $args ) {

    // merge w/default args
    $args = wp_parse_args( $args, array (
        'author'        =>  -1,
        'orderby'       =>  'post_date',
        'order'         =>  'ASC',
        'posts_per_page'=>  25
    ));

    // pull the user's posts
    $user_posts = get_posts( $args );

    // some commands
    echo '<ul>';
    foreach ( $user_posts as $post ) {
        echo "<li>$post->post_title</li>";
    }
    echo '</ul>';
}




Here is a simplified example of a closure working
$total = array();

add_action('count_em_dude', function() use (&$total) { $total[] = count($total); } );

do_action ('count_em_dude' );
do_action ('count_em_dude' );
do_action ('count_em_dude' );
do_action ('count_em_dude' );
do_action ('count_em_dude' );
do_action ('count_em_dude' );
do_action ('count_em_dude' );

echo implode ( ', ', $total ); // 0, 1, 2, 3, 4, 5, 6




Anonymous vs. Closure
add_action ('custom_action', function(){ echo 'anonymous functions work without args!'; } ); //

add_action ('custom_action', function($a, $b, $c, $d){ echo 'anonymous functions work but default args num is 1, the rest are null - '; var_dump(array($a,$b,$c,$d)); } ); // a

add_action ('custom_action', function($a, $b, $c, $d){ echo 'anonymous functions work if you specify number of args after priority - '; var_dump(array($a,$b,$c,$d)); }, 10, 4 ); // a,b,c,d

// CLOSURE

$value = 12345;
add_action ('custom_action', function($a, $b, $c, $d) use ($value) { echo 'closures allow you to include values - '; var_dump(array($a,$b,$c,$d, $value)); }, 10, 4 ); // a,b,c,d, 12345

// DO IT!

do_action( 'custom_action', 'aa', 'bb', 'cc', 'dd' ); 




Proxy Function Class
class ProxyFunc {
    public $args = null;
    public $func = null;
    public $location = null;
    public $func_args = null;
    function __construct($func, $args, $location='after', $action='', $priority = 10, $accepted_args = 1) {
        $this->func = $func;
        $this->args = is_array($args) ? $args : array($args);
        $this->location = $location;
        if( ! empty($action) ){
            // (optional) pass action in constructor to automatically subscribe
            add_action($action, $this, $priority, $accepted_args );
        }
    }
    function __invoke() {
        // current arguments passed to invoke
        $this->func_args = func_get_args();

        // position of stored arguments
        switch($this->location){
            case 'after':
                $args = array_merge($this->func_args, $this->args );
                break;
            case 'before':
                $args = array_merge($this->args, $this->func_args );
                break;
            case 'replace':
                $args = $this->args;
                break;
            case 'reference':
                // only pass reference to this object
                $args = array($this);
                break;
            default:
                // ignore stored args
                $args = $this->func_args;
        }

        // trigger the callback
        call_user_func_array( $this->func, $args );

        // clear current args
        $this->func_args = null;
    }
}
Example Usage #1
$proxyFunc = new ProxyFunc(
    function() {
        echo "<pre>"; print_r( func_get_args() ); wp_die();
    },
    array(1,2,3), 'after'
);

add_action('TestProxyFunc', $proxyFunc );
do_action('TestProxyFunc', 'Hello World', 'Goodbye'); // Hello World, 1, 2, 3
Example Usage #2
$proxyFunc = new ProxyFunc(
    function() {
        echo "<pre>"; print_r( func_get_args() ); wp_die();
    },                  // callback function
    array(1,2,3),       // stored args
    'after',            // position of stored args
    'TestProxyFunc',    // (optional) action
    10,                 // (optional) priority
    2                   // (optional) increase the action args length.
);
do_action('TestProxyFunc', 'Hello World', 'Goodbye'); // Hello World, Goodbye, 1, 2, 3


                        
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