reflection - Reconstruct / get source code of a PHP function

Question

Can I programmatically get the source code of a function by its name?

Like:

function blah($a, $b) { return $a*$b; }
echo getFunctionCode("blah");

is it possible?

Are there any php self-descriptive functions to reconstruct function/class code? (I mean instead of getting source code right from the source file.)

In Java there exists: http://java.sun.com/developer/technicalArticles/ALT/Reflection/

Answer 1

Expanding on the suggestion to use the ReflectionFunction, you could use something like this:

$func = new ReflectionFunction('myfunction');
$filename = $func->getFileName();
$start_line = $func->getStartLine() - 1; // it's actually - 1, otherwise you wont get the function() block
$end_line = $func->getEndLine();
$length = $end_line - $start_line;

$source = file($filename);
$body = implode("", array_slice($source, $start_line, $length));
print_r($body);