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Ingy döt Net 2013-04-11 01:07:29 -07:00
parent b83f433714
commit 68f8f3e56b
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26
Task/Y-combinator/PHP/y-combinator-2.php Normal file
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<?php
function Y($f) {
$g = create_function('$w', '$f = '.var_export($f,true).';
return $f(create_function(\'\', \'$w = \'.var_export($w,true).\';
return call_user_func_array($w($w), func_get_args());
\'));
');
return $g($g);
}
function almost_fib($f) {
return create_function('$i', '$f = '.var_export($f,true).';
return ($i <= 1) ? $i : ($f($i-1) + $f($i-2));
');
};
$fibonacci = Y('almost_fib');
echo $fibonacci(10), "\n";
function almost_fac($f) {
return create_function('$i', '$f = '.var_export($f,true).';
return ($i <= 1) ? 1 : ($f($i - 1) * $i);
');
};
$factorial = Y('almost_fac');
echo $factorial(10), "\n";
?>