如何在參數爲數組或可調用時執行函數？

Question

看看這個例子代碼：

，我發現了錯誤：

Fatal error: Uncaught Error: Cannot use object of type Closure as array in C:\xampp\htdocs\dermaquality\test.php:11 Stack trace: #0 C:\xampp\htdocs\dermaquality\test.php(20): test(Object(Closure)) #1 {main} thrown in

$array = array(
    'hello' => function() { 
     echo "HEllo world"; 
    } 
); 

function test($func) 
{ 
    if (is_callable($func['hello'])) { 
     $func['hello'](); 
    } 
    else { 
     $func(); 
    } 
} 

echo "Executing 1 <br/>"; 
test($hello = function() {"Hello world";}); 
echo "Executing 2 <br/>"; 
test($array['hello']); 
exit; 

我怎麼能說$func如果$func是功能或$func['hello']是功能？

謝謝。

Answer 1

問題是if (is_callable($func['hello'])) {，因爲你不知道，如果$func是一個數組..順便說一句，你不把數組作爲參數test($array['hello']);你把剛纔的功能...

function test($func) 
{ 
    if (is_callable($func)) { 
     $func(); 
    } 
    else if (is_array($func)){ 
     if(isset($func['hello']) && is_callable($func['hello'])){ 
      $func['hello'](); 
     }else{ 
      // unknown what to call 
     } 
    }else{ 
     // unknown what to call 
    } 
}