PHP function to convert HSL to RGB or Hex

Copied from this SO Answer by Cullub.

This code worked perfectly to convert a user email to user avatar colour. After long hours of searching, I got the correct hex value similar to the one generated using javascript on the front end.

TL;DR: The full code can be found here on Pastebin.

/**
 * convert user email to hsl for user avatar
 * @param string $string
 * @return string HEX color code
 */
function stringToColor($string)
{
    $hash = 0;
    $l = 70;
    $s = 60;
    for ($i = 0; $i < strlen($string); $i++) {
        $hash = ord($string[$i]) + (($hash << 5) - $hash);
    }
    $h = fmod($hash, 360);
    return $this->hslToHex($h, $s, $l, true);
}

/**
 * Converts HSL to Hex by converting it to 
 * RGB, then converting that to hex.
 * 
 * string hslToHex($h, $s, $l[, $prependPound = true]
 * 
 * $h is the Degrees value of the Hue
 * $s is the Percentage value of the Saturation
 * $l is the Percentage value of the Lightness
 * $prependPound is a bool, whether you want a pound 
 *  sign prepended. (optional - default=true)
 *
 * Calls: 
 *   hslToRgb
 *
 * Output: Hex in the format: #00ff88 (with 
 * pound sign).  Rounded to the nearest whole
 * number.
 */
function hslToHex($h, $s, $l, $prependPound = true)
{
    //convert hsl to rgb
    $rgb = $this->hslToRgb($h, $s, $l);

    //convert rgb to hex
    $hexR = $rgb['r'];
    $hexG = $rgb['g'];
    $hexB = $rgb['b'];

    //round to the nearest whole number
    $hexR = round($hexR);
    $hexG = round($hexG);
    $hexB = round($hexB);

    //convert to hex
    $hexR = dechex($hexR);
    $hexG = dechex($hexG);
    $hexB = dechex($hexB);

    //check for a non-two string length
    //if it's 1, we can just prepend a
    //0, but if it is anything else non-2,
    //it must return false, as we don't 
    //know what format it is in.
    if (strlen($hexR) != 2) {
        if (strlen($hexR) == 1) {
            //probably in format #0f4, etc.
            $hexR = "0" . $hexR;
        } else {
            //unknown format
            return false;
        }
    }
    if (strlen($hexG) != 2) {
        if (strlen($hexG) == 1) {
            $hexG = "0" . $hexG;
        } else {
            return false;
        }
    }
    if (strlen($hexB) != 2) {
        if (strlen($hexB) == 1) {
            $hexB = "0" . $hexB;
        } else {
            return false;
        }
    }

    //if prependPound is set, will prepend a
    //# sign to the beginning of the hex code.
    //(default = true)
    $hex = "";
    if ($prependPound) {
        $hex = "#";
    }

    $hex = $hex . $hexR . $hexG . $hexB;

    return $hex;
}
/**
 * Converts an HSL color value to RGB. Conversion formula
 * adapted from http://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/.
 * Assumes h, s, and l are in the format Degrees,
 * Percent, Percent, and returns r, g, and b in 
 * the range [0 - 255].
 *
 * Called by hslToHex by default.
 *
 * Calls: 
 *   degPercPercToHsl
 *   hueToRgb
 *
 * @param   Number  h       The hue value
 * @param   Number  s       The saturation level
 * @param   Number  l       The luminence
 * @return  Array           The RGB representation
 */
function hslToRgb($h, $s, $l)
{
    //convert the hue's 360 degrees in a circle to 1
    $h /= 360;
    //convert the saturation and lightness to the 0-1 
    //range by multiplying by 100
    $s /= 100;
    $l /= 100;

    //If there's no saturation, the color is a greyscale,
    //so all three RGB values can be set to the lightness.
    //(Hue doesn't matter, because it's grey, not color)
    if ($s == 0) {
        $r = $l * 255;
        $g = $l * 255;
        $b = $l * 255;
    } else {
        //calculate some temperary variables to make the 
        //calculation eaisier.
        if ($l < 0.5) {
            $temp2 = $l * (1 + $s);
        } else {
            $temp2 = ($l + $s) - ($s * $l);
        }
        $temp1 = 2 * $l - $temp2;

        //run the calculated vars through hueToRgb to
        //calculate the RGB value.  Note that for the Red
        //value, we add a third (120 degrees), to adjust 
        //the hue to the correct section of the circle for
        //red.  Simalarly, for blue, we subtract 1/3.
        $r = 255 * $this->hueToRgb($temp1, $temp2, $h + (1 / 3));
        $g = 255 * $this->hueToRgb($temp1, $temp2, $h);
        $b = 255 * $this->hueToRgb($temp1, $temp2, $h - (1 / 3));
    }
    $rgb['r'] = $r;
    $rgb['g'] = $g;
    $rgb['b'] = $b;
    return $rgb;
    // return "rgb($r, $g, $b)";
}
/**
 * Converts an HSL hue to it's RGB value.  
 *
 * Input: $temp1 and $temp2 - temperary vars based on 
 * whether the lumanence is less than 0.5, and 
 * calculated using the saturation and luminence
 * values.
 *  $hue - the hue (to be converted to an RGB 
 * value)  For red, add 1/3 to the hue, green 
 * leave it alone, and blue you subtract 1/3 
 * from the hue.
 *
 * Output: One RGB value.
 *
 * Thanks to Easy RGB for this function (Hue_2_RGB).
 * http://www.easyrgb.com/index.php?X=MATH&$h=19#text19
 *
 */
function hueToRgb($temp1, $temp2, $hue)
{
    if ($hue < 0) {
        $hue += 1;
    }
    if ($hue > 1) {
        $hue -= 1;
    }

    if ((6 * $hue) < 1) {
        return ($temp1 + ($temp2 - $temp1) * 6 * $hue);
    } elseif ((2 * $hue) < 1) {
        return $temp2;
    } elseif ((3 * $hue) < 2) {
        return ($temp1 + ($temp2 - $temp1) * ((2 / 3) - $hue) * 6);
    }
    return $temp1;
}