Laravel 5 - 在helpers.php中使用Package

Question

I have this ColorThief\ColorThief package that works well inside a controller.

However, I want to create a function getImageColor($imgName) in helper.php to consume ColorThief\ColorThief so I can use getImageColor($imgName) directly from views.

How can I access ColorThief\ColorThief from inside helper.php.

---

use ColorThief\ColorThief;

function getImageColor($img='') {
    if(!empty($img)) {
        $upload_path = public_path() . '/uploads/'.$img;
        if(file_exists($upload_path)) {
            return ColorThief::getColor($upload_path);
        }
    }
    return false;
}

When I call getImageColor('image.jpg'), I get the following error:

htmlspecialchars() expects parameter 1 to be string, array given (View: /home/userxyz/public_html/dev/resources/views/welcome.blade.php)

Please note that when ColorThief::getColor($upload_path); is used inside a controller, it works perfectly.

Answer 1

In your helper.php you can use it like this:

use ColorThief\ColorThief;

function getImageColor($sourceImage)
{
    return ColorThief::getColor($sourceImage);
}

The $sourceImage variable must contain either the absolute path of the image on the server, a URL to the image, a GD resource containing the image, an Imagick image instance, a Gmagick image instance, or an image in binary string format. Package Github Repository.

Update:

This function returns an array of three integer values, corresponding to the RGB values (Red, Green & Blue) of the dominant color. Example: array(r: num, g: num, b: num)

Further to convert the RGB to HEX you may use the following function:

function rgb2hex($rgb)
{
    $hex .= str_pad(dechex($rgb[0]), 2, "0", STR_PAD_LEFT);
    $hex .= str_pad(dechex($rgb[1]), 2, "0", STR_PAD_LEFT);
    $hex .= str_pad(dechex($rgb[2]), 2, "0", STR_PAD_LEFT);
    return "#".$hex;
}

For example:

$color = rgb2hex(getImageColor($sourceImage)); // #ffffff for white