PHP syntax to call methods on temporary objects

Question

Is there a way to call a method on a temporary declared object without being forced to assign 1st the object to a variable?

See below:

class Test
{
   private $i = 7;      
   public function get() {return $this->i;}   
}

$temp = new Test();
echo $temp->get(); //ok

echo new Test()->get(); //invalid syntax
echo {new Test()}->get(); //invalid syntax
echo ${new Test()}->get(); //invalid syntax

Answer 1

Unfortunately, you can't do that. It's just the way PHP is, I'm afraid.

Answer 2

Impossible and why would you create an object this way at all?

The point of an object is to encapsulate unique state. In the example you gave, $i will always be 7, so there is no point in creating the object, then getting $i from it and then losing the object to the Garbage collector because there is no reference to the object after $i was returned. A static class, like shown elsewhere, makes much more sense for this purpose. Or a closure.

Related topic:

• http://www.mail-archive.com/[email protected]/msg44919.html
• http://bugs.php.net/bug.php?id=23022&edit=1
• http://www.mail-archive.com/[email protected]/msg07610.html

Answer 3

No. This is a limitation in PHP's parser.

Answer 4

What you can do is

class Test
{
   private $i = 7;      
   public function get() {return $this->i;}

   public static function getNew() { return new self(); }
}

echo Test::getNew()->get();

Answer 5

Why not just do this:

class Test
{
   private static $i = 7;      
   public static function get() {return self::$i;}   
}

$value = Test::get();

Answer 6

You'd probably be interested in the manual page for the static keyword.

Answer 7

i often use this handy little function

 function make($klass) {
    $_ = func_get_args();
    if(count($_) < 2)
        return new $klass;
    $c = new ReflectionClass($klass);
    return $c->newInstanceArgs(array_slice($_, 1));
 }

usage

make('SomeCLass')->method();

or

make('SomeClass', arg1, arg2)->foobar();

Answer 8

This has come up very recently on php-internals, and unfortunately some influential people (e. g. sniper) active in development of PHP oppose the feature. Drop an email to [email protected], let them know you're a grownup programmer.

Answer 9

I use the following workaround when I want to have this behaviour.

I declare this function (in the global scope) :

function take($that) { return $that; }

Then I use it this way :

echo take(new Test())->get();