哪里定义了php函数？ [重复]

Possible Duplicate:
How to find out where a function is defined?

I wanna know (programmatically, probably through reflection API) where a certain PHP function is defined.

There's stuff in the ReflectionFunction class that looks relevant (getFileName, getStartLine, etc.).

(Untested)

debug_backtrace() will give back an array with all calls being made, and also the definition of the functions/methods. The reflection class will give you the definition of the function.

e.g. I use this to log deprectated function within older projects:

function logDeprecated() {
    $trail = debug_backtrace();
    if ($trail[1]['type']) {
        $function = new ReflectionMethod($trail[1]['class'], $trail[1]['function']);
    } else {
        $function = new ReflectionFunction($trail[1]['function']);
    }
    $errorMsg = 'Function ' . $trail[1]['function'];
    if ($trail[1]['class']) {
        $errorMsg .= ' of class ' . $trail[1]['class'];
    }
    $errorMsg .= ' is deprecated (called from ' . $trail[1]['file'] . '#' . $trail[1]['line'] . ', defined in ' . $function->getFileName() . '#' . $function->getStartLine() . ')';
        return $errorMsg;
}

ReflectionMethod::getStartLine()
ReflectionMethod::getFileName()
ReflectionFunction::getStartLine()
ReflectionFunction::getFileName()

probably it is not best solution, but in case you wont find anyting, you can find function location using grep command if you are using linux.

exec('grep -irn "yourFunctionName" ./library', $response);
foreach ($response as $file) {
    list($filename, $line) = explode(":", $file);
}