(PHP 5, PHP 7, PHP 8)
ReflectionParameter::__construct — Construct
$function
, int|string $param
)Constructs a ReflectionParameter instance.
function
The function to reflect parameters from.
param
Either an int specifying the position of the parameter (starting with zero), or the parameter name as string.
Example #1 Using the ReflectionParameter class
<?phpfunction foo($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' );}?>
The above example will output something similar to:
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 }