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run code in 300+ PHP versions simultaneously

@ 2014-09-02T23:57:09Z

<?php

$memoize = function ($fn, $cacheKeyFn = null, $limit = null) {
    $cache = array();
    return function () use ($fn, $cacheKeyFn, $limit, & $cache) {
        $args = func_get_args();
		if ($cacheKeyFn) {
            $key = call_user_func_array($cacheKeyFn, $args);
		} else {
			$key = reset($args);
		}
        if (isset($cache[$key])) {
            return $cache[$key];
        }
        $result = call_user_func_array($fn, $args);
        if ($limit !== null && count($cache) === $limit) {
            array_shift($cache);
        }
        $cache[$key] = $result;
        return $result;
    };
};

$numCalls = 0;
$memoFib = $memoize(
    function ($n) use (& $memoFib, & $numCalls) {
        $numCalls++;
        if ($n === 1 || $n === 2) return 1;
            return $memoFib($n - 1) + $memoFib($n - 2);
        }
    }
);

        foreach (range(0,1) as $i) {
            echo $memoFib($i) . PHP_EOL;
        }

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.32: Parse error: syntax error, unexpected '}' in /in/nhTmd on line 31
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION in /in/nhTmd on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION in /in/nhTmd on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/nhTmd on line 3
Process exited with code 255.

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