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(PHP 5)
ReflectionParameter 取回了函数或方法参数的相关信息。
要自行检查函数的参数,首先创建一个 ReflectionFunction 或 ReflectionMethod 的实例,然后使用它们的 ReflectionFunctionAbstract::getParameters() 方法来获取参数的数组。
$function
, string $parameter
)$function
, string $parameter
[, bool $return
] )参数的名称。只读,在尝试赋值的时候会抛出 ReflectionException。
[#1] fgm at riff dot org [2008-05-11 12:44:32]
The note about the signature of the ReflectionParameter constructor is actually incomplete, at least in 5.2.5: it is possible to use an integer for the second parameter, and the constructor will use it to return the n-th parameter.
This allows you to obtain proper ReflectionParameter objects even when documenting code from extensions which (strangely enough) define several parameters with the same name. The string-based constructor always returns the first parameter with the matching name, whereas the integer-based constructor correctly returns the n-th parameter.
So, in short, this works:
<?php
// supposing the extension defined something like:
// Some_Class::someMethod($a, $x, $y, $x, $y)
$p = new ReflectionParameter(array('Some_Class', 'someMethod'), 4);
// returns the last parameter, whereas
$p = new ReflectionParameter(array('Some_Class', 'someMethod'), 'y');
// always returns the first $y at position 2
?>
[#2] killgecNOFSPAM at gmail dot com [2007-07-25 05:53:29]
Signature of constructor of ReflectionParameter correctly is:
public function __construct(array/string $function, string $name);
where $function is either a name of a global function, or a class/method name pair.
[#3] massimo at mmware dot it [2007-07-18 08:58:55]
I found these limitations using class ReflectionParameter from ReflectionFunction with INTERNAL FUNCTIONS (eg print_r, str_replace, ... ) :
1. parameter names don't match with manual: (try example 19.35 with arg "call_user_func" )
2. some functions (eg PCRE function, preg_match etc) have EMPTY parameter names
3. calling getDefaultValue on Parameters will result in Exception "Cannot determine default value for internal functions"