How to Create an Image in PHP

PHP is a scripting language that allows you to do many things needed on a website. Among those things is the ability to create images. This can be useful for things like creating CAPTCHA images or even designing a banner or logo on the fly the way some free blogging software does.

To create an image in PHP, you need to use a function that is part of the GD library. There are a few different ones, but the one most commonly used is imageline(). This function draws a line between two given points in an image. It takes four parameters:

x1 - The x coordinate for the first point. y1 - The y coordinate for the first point. x2 - The x coordinate for the second point. y2 - The y coordinate for the second point. color - The line color. The color must be a GdImage object returned by one of the image creation functions, such as imagecreatetruecolor(). This function returns TRUE on success or FALSE on failure.

If you run into any errors during this process, check your hosting’s GD configuration to make sure it supports this library. Then, try again. Once you’ve got your image created, you can upload it to your site using file_get_contents or file_put_contents. In the future, you can then import your image into a WordPress property gallery by specifying its URL. If you want to display multiple images in a row, you can use the wp_get_attachment_url function in your WordPress theme.

Andreas Behr - CTO of DesertCoderz
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imageline example

$string = implode(' ', str_split($string));

        if (!empty($font)) {
            for ($i = 0, $iMax = \strlen($string); $i < $iMax; ++$i) {
                $rand1 = Random::getInteger(35, 40);
                $rand2 = Random::getInteger(15, 20);
                $rand3 = Random::getInteger(60, 70);
                imagettftext($im, $rand1, $rand2, ($i + 1) * 15, $rand3, $black, $font, $string[$i]);
                imagettftext($im, $rand1, $rand2, (($i + 1) * 15) + 2, $rand3 + 2, $black, $font, $string[$i]);
            }
            for ($i = 0; $i < 8; ++$i) {
                imageline($im, Random::getInteger(30, 70), Random::getInteger(0, 50), Random::getInteger(100, 150),
                    Random::getInteger(20, 100), $black);
                imageline($im, Random::getInteger(30, 70), Random::getInteger(0, 50), Random::getInteger(100, 150),
                    Random::getInteger(20, 100), $black);
            }
        } else {
            $white = (int) imagecolorallocate($im, 255, 255, 255);
            imagestring($im, 5, 40, 35, $string, $white);
            imagestring($im, 3, 40, 70, 'missing font', $white);
        }

        return $im;
    }
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