I would like to know whether there's a way to chain methods on a newly created object in PHP?
Something like:
class Foo {
public function xyz() { ... return $this; }
}
$my_foo = new Foo()->xyz();
Anyone know of a way to achieve this?
Source: Tips4all
No, when you're using the
ReplyDeletenew Classname();
syntax, you can't chain a method call off the instantiation. It's a limitation of PHP's syntax. Once an object is instantiated, you can chain away.
One method I've seen used to get around this is a static instantiation method of some kind.
class Foo
{
public function xyz()
{
echo "Called","\n";
return $this;
}
static public function instantiate()
{
return new self();
}
}
$a = Foo::instantiate()->xyz();
By wrapping the call to new in a static method, you can instantiate a class with method call, and you're then free to chain off that.
Define a global function like this:
ReplyDeletefunction with($object){ return $object; }
You will then be able to call:
with(new Foo)->xyz();
It would be really helpful if they 'fix this' in a future release. I really appreciate the ability to chain (especially when populating collections):
ReplyDeleteI added a method to the base class of my framework called create() that can be chained off of. Should work with all descendant classes automatically.
class baseClass
{
...
public final static function create()
{
$class = new \ReflectionClass(get_called_class());
return $class->newInstance(func_get_args());
}
...
public function __call($method, $args)
{
$matches = array();
if (preg_match('/^(?:Add|Set)(?<prop>.+)/', $method, $matches) > 0)
{
// Magic chaining method
if (property_exists($this, $matches['prop']) && count($args) > 0)
{
$this->$matches['prop'] = $args[0];
return $this;
}
}
}
...
}
Class::create()->SetName('Kris')->SetAge(36);