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@ 2014-07-25T08:37:10Z

<?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++) {
            $c = base_convert(substr($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 git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: Unsupported operand types: int + string in /in/jVenI:8 Stack trace: #0 /in/jVenI(25): ColorLuminance('69c', 0) #1 {main} thrown in /in/jVenI on line 8
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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