
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

?>

down

killgecNOFSPAM at gmail dot com ¶

14 years ago


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.

down

massimo at mmware dot it ¶

14 years ago


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"

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官方地址：https://www.php.net/manual/en/class.reflectionparameter.php

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ReflectionParameter 类

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