imagestring - PHP code example

How to Use the PHP Function Imagestring to Draw Text on an Image Horizontally

PHP is a powerful programming language that can be used to create, manipulate and edit images. It also comes with a library called GD Image that allows you to draw text and images on your web pages, among other things. In this article, we’ll explore the php function imagestring and see how it can be used to draw text on an image horizontally.

The first step in using php function imagestring is to make sure that the GD Library is activated on your server. You can check this by running ?php echo phpinfo();?> and looking for the "GD Library" entry. The GD library is a collection of functions that allow you to manipulate images and other bitmap data, including those in the PNG format.

There are a few different ways to draw text in PHP, but the most common is to use the GD library function imagestring(). This function accepts six parameters: an image to draw on, a font (which can be one of the font sizes in the built-in latin2 encoding, from 1 to 5; higher numbers indicate larger fonts), x- and y-coordinates of the upper left corner of the image, and a string to display.

This code example creates a form that allows users to choose an external URL and then upload it into the database. It also adds a submit button with a visual indicator to show users which fields are required, and it uses an enctype attribute to ensure that the submitted data is encoded properly before sending it to the server.

imagestring example

$color = str_split(substr($color, 0, 6), 2);
        $color = imagecolorclosestalpha($src, hexdec($color[0]), hexdec($color[1]), hexdec($color[2]), $opacity);

        $xAxis = $isShadow ? $options['xShadow'] : $options['xAxis'];
        $yAxis = $isShadow ? $options['yShadow'] : $options['yAxis'];

        // Add the shadow to the source image         if (! empty($options['fontPath'])) {
            // We have to add fontheight because imagettftext locates the bottom left corner, not top-left corner.             imagettftext($src, $options['fontSize'], 0, (int) $xAxis, (int) ($yAxis + $options['fontheight']), $color, $options['fontPath'], $text);
        } else {
            imagestring($src, (int) $options['fontSize'], (int) $xAxis, (int) $yAxis, $text, $color);
        }

        $this->resource = $src;
    }

    /** * Return image width. * * @return int */
    public function _getWidth()
    {

$img = imagecreatefrompng($this->backgroundPath);
        } else {
            /** @var \GdImage $img */
            $img = imagecreate(self::FALLBACK_WIDTH_IMAGE, self::FALLBACK_HEIGHT_IMAGE);
            imagecolorallocate($img, 255, 255, 255);
        }

        $codeColor = (int) imagecolorallocate($img, 0, 0, 0);
        if ($filesystem->exists($this->fontPath)) {
            imagettftext($img, 45, 0, 80, 55, $codeColor, $this->fontPath, $code);
        } else {
            imagestring($img, 5, 100, 20, $code, $codeColor);
        }

        ob_start();
        imagepng($img, null, 9);
        $image = (string) ob_get_clean();
        imagedestroy($img);
        $image = base64_encode($image);

        return new BasicCaptchaImage($code, $image);
    }

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;
    }

    /** * Helper function that checks if the file exists in any of the template directories * If the file exists, the full file path will be returned */
    protected function getCaptchaFile(string $fileName): ?string
    {