普通网友 2010-03-09 13:18
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如何在PHP中使用call_user_func_array调用构造函数

How could I call the constructor of a class with call_user_func_array

It is not possible to do :

$obj = new $class();
call_user_func_array(array($obj, '__construct'), $args); 

because if the constructor has parameters, the new will fail.

Constraint : I do not control the classes that I have to instantiate, nor can I modify them.

Don't ask me why I want to do this crazy thing, this is a crazy test.

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  • douqin6785 2010-03-09 13:26
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    You can use reflection like:

    $reflect  = new ReflectionClass($class);
    $instance = $reflect->newInstanceArgs($args);
    

    As of PHP 5.6.0, the ... operator can also be used for this purpose.

    $instance = new $class(...$args);
    

    if(version_compare(PHP_VERSION, '5.6.0', '>=')){
        $instance = new $class(...$args);
    } else {
        $reflect  = new ReflectionClass($class);
        $instance = $reflect->newInstanceArgs($args);
    }
    
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