(PHP 5)
ReflectionClass::getConstructor — Gets the constructor of the class
Gets the constructor of the reflected class.
This function has no parameters.
   A ReflectionMethod object reflecting the class' constructor, or NULL if the class
   has no constructor.
  
Example #1 Basic usage of ReflectionClass::getConstructor()
<?php
$class = new ReflectionClass('ReflectionClass');
$constructor = $class->getConstructor();
var_dump($constructor);
?>
The above example will output:
object(ReflectionMethod)#2 (2) {
  ["name"]=>
  string(11) "__construct"
  ["class"]=>
  string(15) "ReflectionClass"
}