How do I get the type of constructor parameter via reflection?

Question

I\'m using type hinting on my constructor parameter list like so:

public function __construct(FooRepository $repository)

Is there a way to

Answer 1

Check out PHP 5.4

They are planning to get out PHP 5.4 this year, which will have the reflection method (current in the dev builds) of parameter->getHint()

However, until 5.4 goes GA, I am using ReflectionClass::getDocComment()

For example, you can specify it in @param.

// Adapted from meager's example
class Bar {}

class Foo {
    /**
    * @param MyType $value
    * @param array $value2
    */
    function __construct(Bar $value, array $value2) {
    }
}

// Regex
function getHint( $docComment, $varName ) {
    $matches = array();
    $count = preg_match_all('/@param[\t\s]*(?P[^\t\s]*)[\t\s]*\$(?P[^\t\s]*)/sim', $docComment, $matches);
    if( $count>0 ) {
        foreach( $matches['name'] as $n=>$name ) {
            if( $name == $varName ) {
                return $matches['type'][$n];
            }
        }
    }
    return null;
}

$reflection = new ReflectionClass('Foo');
$constructor= $reflection->getConstructor();
$docComment = $constructor->getDocComment();
$params = $constructor->getParameters();
foreach ($params AS $param) {
    $name = $param->getName();
    echo $name ." is ";
    //echo $param->getHint()."\n"; // in PHP 5.4
    echo getHint($docComment, $name)."\n"; // work around
}

Output:

value is MyType
value2 is array