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run code in 300+ PHP versions simultaneously

@ 2014-07-25T08:39:02Z

<?php
	function ColorLuminance($hex, $lum)
    {

        // validate hex string
        $hex = preg_replace("/[^0-9a-f]/i", "", $hex);
        if (strlen($hex) < 6) {
            $hex = $hex[0] . $hex[0] . $hex[1] . $hex[1] . $hex[2] . $hex[2];
        }

        // convert to decimal and change luminosity
        $rgb = "#";
        for ($i = 0; $i < 3; $i++) {

            echo substr($hex, $i * 2, 2) . " * ";

            $c = base_convert(substr($hex, $i * 2, 2), 16, 10);
            echo $c . " - ";
            $c = base_convert((round(min(max(0, floatval($c + ($c * $lum))),255))), 10, 16);
            echo $c . " - ";
            $rgb .= substr('00' + $c, strlen($c));
            echo $rgb . " - ";
        }

        return $rgb;
    }

echo ColorLuminance("#69c", 0) . "\n"; // returns "#6699cc"
/*echo ColorLuminance("6699CC", 0.2) . "\n";// "#7ab8f5" - 20% lighter
echo ColorLuminance("69C", -0.5) . "\n";// "#334d66" - 50% darker
echo ColorLuminance("000", 1) . "\n";// "#000000" - true black cannot be made lighter!*/

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: 66 * 102 - 66 - # - 99 * 153 - 99 - # - cc * 204 - cc - Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /in/cluFm:21 Stack trace: #0 /in/cluFm(28): ColorLuminance('6699cc', 0) #1 {main} thrown in /in/cluFm on line 21
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: 66 * 102 - 66 - # - 99 * 153 - 99 - # - cc * 204 - cc - Warning: A non-numeric value encountered in /in/cluFm on line 21 # - #
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20: 66 * 102 - 66 - # - 99 * 153 - 99 - # - cc * 204 - cc - # - #

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281.1 ms | 404 KiB | 341 Q