Create an image from Text

CreateImageFromText.php

<?php

class CreateImageFromText
{
    /**
     * @param string $text_string
     * @param array $request
     * @return string
     */
    public static function createImageFromText(string $text_string, $request = [])
    {
        if (!$text_string) {
            throw new \RuntimeException("Text cannot be null");
        }

        $config = [
            'font_size' =>  isset($request['font_size']) ? (!$request['font_size'] || !is_numeric($request['font_size']) ? 20 : $request['font_size']) : 20,
            'text_angle' =>  isset($request['text_angle']) ? (!$request['text_angle'] || !is_numeric($request['text_angle']) ? 0 : $request['text_angle']) : 0,
            'text_padding' =>  isset($request['text_padding']) ? (!$request['text_padding'] || !is_numeric($request['text_padding']) ? 20 : $request['text_padding']) : 20,
        ];

        if (isset($request['bg_rgb'])) {
            $rgb = explode(',', $request['bg_rgb']);
            if (count($rgb) != 3) {
                throw new \RuntimeException("Invalid RGB");
            }
        }

        if (isset($request['txt_rgb'])) {
            $trgb = explode(',', $request['txt_rgb']);
            if (count($trgb) != 3) {
                throw new \RuntimeException("Invalid RGB");
            }
        }

        $font_ttf = resource_path('assets/fonts/Poppins-Regular.ttf');

        $the_box = self::calculateTextBox($text_string, $font_ttf, $config['font_size'], $config['text_angle']);
        $imgWidth = $the_box["width"] + $config['text_padding'];
        $imgHeight = $the_box["height"] + $config['text_padding'];

        $image = imagecreate($imgWidth, $imgHeight);
        imagefill($image,0,0, imagecolorallocate($image, $rgb[0] ?? 220,$rgb[1] ?? 220,$rgb[2] ?? 220));

        $color = imagecolorallocate($image,$trgb[0] ?? 225,$trgb[1] ?? 0,$trgb[2] ?? 0);
        imagettftext($image,
            $config['font_size'],
            $config['text_angle'],
            $the_box["left"] + ($imgWidth / 2) - ($the_box["width"] / 2),
            $the_box["top"] + ($imgHeight / 2) - ($the_box["height"] / 2),
            $color,
            $font_ttf,
            $text_string);

        ob_start();
        imagejpeg($image);
        $contents = ob_get_contents();
        ob_end_clean();
        imagedestroy($image);

        return 'data:image/png;base64,'.base64_encode($contents);
    }

    /**
     * @param $text
     * @param $fontFile
     * @param $fontSize
     * @param $fontAngle
     * @return array
     */
    private static function calculateTextBox($text, $fontFile, $fontSize, $fontAngle)
    {
        $rect = imagettfbbox($fontSize,$fontAngle,$fontFile,$text);
        $minX = min(array($rect[0],$rect[2],$rect[4],$rect[6]));
        $maxX = max(array($rect[0],$rect[2],$rect[4],$rect[6]));
        $minY = min(array($rect[1],$rect[3],$rect[5],$rect[7]));
        $maxY = max(array($rect[1],$rect[3],$rect[5],$rect[7]));

        return array(
            "left"   => abs($minX) - 1,
            "top"    => abs($minY) - 1,
            "width"  => $maxX - $minX,
            "height" => $maxY - $minY,
            "box"    => $rect
        );
    }

}