Online PHP editor | refs for h9nA3

<?php // The slow, although default way of doing fibonacci --------------------------- function _fibs($n) { if ($n < 2) return $n; else return _fibs($n-1) + _fibs($n-2); } function fibs() { $i = 0; while (1) yield _fibs($i++); } // The speedy way to do fibonacci----------------------------------------------- function fibf() { $a = 0; $b = 0; $t = 1; while (1) { yield $b; if ($b > 0) { $t = $a; $a = $b; } $b += $t; } } // Test utils ------------------------------------------------------------------ // // function to test an iterator by iterating it until the $compare function // returns false // // print the result visually because its sexy function visual_iterator_tester($fn, $cmpr) { echo "timing $fn "; $then = time(); foreach ($fn() as $f) { if ($cmpr($f)) break; echo "."; } $now = time(); $diff = $now - $then; echo "\n$fn completed in $diff second(s)\n"; } // Run the damn thing ---------------------------------------------------------- $fns = ['fibs', 'fibf']; $runs = 9999999; foreach ($fns as $fn) visual_iterator_tester($fn, function($a) use($runs) { return $a > $runs; });