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@ 2023-08-25T17:11:22Z

<?php

$rgba = 'rgba(80,80,80,0.5)';

function blendChannels(float $alpha, int $channel1, int $channel2): int
{
    // blend 2 channels
    return intval(($channel1 * $alpha) + ($channel2 * (1.0 - $alpha)));
}

function convertRGBAtoHEX6(string $rgba): string
{
    // sanitize
    $rgba = strtolower(trim($rgba));
    // check
    if (substr($rgba, 0, 5) != 'rgba(') {
        return $rgba;
    }
    // extract channels
    $channels = explode(',', substr($rgba, 5, strpos($rgba, ')') - 5));
    // compute rgb with white background
    $alpha = $channels[3];
    $r = blendChannels($alpha, $channels[0], 0xFF);
    $g = blendChannels($alpha, $channels[1], 0xFF);
    $b = blendChannels($alpha, $channels[2], 0xFF);
    return sprintf('#%02x%02x%02x', $r, $g, $b);
}

echo convertRGBAtoHEX6($rgba);

Output for git.master, git.master_jit, rfc.property-hooks: #a7a7a7

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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