ReflectionParameter::__construct

    (PHP 5, PHP 7, PHP 8)

    ReflectionParameter::__construct — Construct

    说明

    publicReflectionParameter::__construct(string|array|object$function, int|string$param)

    Constructs a ReflectionParameter instance.

    参数

    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.

    示例

    示例 #1 Using the ReflectionParameter class

    <?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'
    );
    }
    ?>

    以上示例的输出类似于：

    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 }

    参见

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