ReflectionParameter::__construct

<?php
function foo($a, $b, $c) { }
function bar(Exception $a, &$b, $c) { }
function baz(ReflectionFunction $a, $b = 1, $c = null) { }
function abc() { }
$reflect = new ReflectionFunction('foo');
echo $reflect;
foreach ($reflect->getParameters() as $i => $param) {
 printf(
 "-- Parameter #%d: %s {\n".
 " Class: %s\n".
 " Allows NULL: %s\n".
 " Passed to by reference: %s\n".
 " Is optional?: %s\n".
 "}\n",
 $i, // $param->getPosition() can be used
 $param->getName(),
 var_export($param->getClass(), 1),
 var_export($param->allowsNull(), 1),
 var_export($param->isPassedByReference(), 1),
 $param->isOptional() ? 'yes' : 'no'
 );
}
?>

Function [ <user> function foo ] {
 @@ /Users/philip/cvs/phpdoc/a 2 - 2
 - Parameters [3] {
 Parameter #0 [ <required> $a ]
 Parameter #1 [ <required> $b ]
 Parameter #2 [ <required> $c ]
 }
}
-- Parameter #0: a {
 Class: NULL
 Allows NULL: true
 Passed to by reference: false
 Is optional?: no
}
-- Parameter #1: b {
 Class: NULL
 Allows NULL: true
 Passed to by reference: false
 Is optional?: no
}
-- Parameter #2: c {
 Class: NULL
 Allows NULL: true
 Passed to by reference: false
 Is optional?: no
}