Simple hex color mixer in PHP

hex_color_mix.php

<?php
function lerp($min, $max, $value) { return $min*(1-$value)+$max*$value; }
function mixColors($colorA, $colorB, $factor){
    
    // Assign R, G and B values for each color
    list($aR, $aG, $aB) = sscanf($colorA, "#%02x%02x%02x");
    list($bR, $bG, $bB) = sscanf($colorB, "#%02x%02x%02x");
    
    // put the colors back together in hex color format with the mixed value
    return sprintf("#%02x%02x%02x", 
        lerp($aR, $bR, $factor),
        lerp($aG, $bG, $factor),
        lerp($aB, $bB, $factor)
    );
}


// Usage
$colorA = '#f16727';
$colorB = '#fdcc71';

mixColors( $colorA, $colorB, 0 ); // returns $colorA (#f16727)
mixColors( $colorA, $colorB, 1 ); // returns $colorB (#fdcc71)
mixColors( $colorA, $colorB, 0.5 ); // returns mixed color (#f7994c)