OG Image Generator in PHP 1.6.1 (GD Driver) (No longer updated, see below)

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New version v2 is in development is located in v2 branch here

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A simple and flexible PHP library for generating Open Graph (OG) (but really any type of) images with customizable backgrounds, text, and watermarks. Perfect for creating dynamic social media preview images for your website or application.

This project was inspired by my clients, each of them wanted to have a custom OG image for their website. One wanted to have a simple image with a quote, another wanted to have an avatar of the user displayed and so on. While there are projects like that and don't get me wrong, they are great, but they are not flexible enough for my needs.

On the other hand, Imagine/Imagine is a great library, but it has a bit of code to write to get the desired result.

say, watermark, for example, you have to write a bit of code to get the desired result.

$watermark = $imagine->open('/my/watermark.png');
$image     = $imagine->open('/path/to/image.jpg');
$size      = $image->getSize();
$wSize     = $watermark->getSize();

$bottomRight = new Imagine\Image\Point($size->getWidth() - $wSize->getWidth(), $size->getHeight() - $wSize->getHeight());

$image->paste($watermark, $bottomRight);

It is simpler than native GD, but still. I wanted it to be straightforward and simple, since I'm using it quite often.

createImage()
addWatermark(bottom,left)
addText('Hello World',center,center)
render()

Done.

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Example Image

NOTE: all highlighted elements are separate layers, so you can easily customize them.

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Image background with text and watermark.

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Resized image background with text. (see original image here)

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Image background with for quote.

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Color background with borders and text.

Fancy Memorial Example

There are 3 watermarks elements in this example: the logo, fancy frame and a portrait and 2 text elements: name and dates.

as used at ForeverAfter.Life - OG

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Table of Contents

• Features
• Requirements
• Installation
• Usage
  • Basic Usage
  • Setting Backgrounds
    • Solid Color Background
    • Image Background
    • Adding Borders
  • Adding Text
    • Text Positioning
    • Text Styling
    • Background Rectangle for Text
  • Adding Watermarks
  • Custom Templates
  • Full Example
• Customization
  • Fonts
  • Padding and Alignment
• License

Features

• Generate OG images or any image with custom dimensions.
• Set backgrounds using solid colors or images.
• Add borders (top,bottom,left,right) to the background.
• Add text with customizable font, size, color, and alignment.
• Wrap text automatically within a specified width.
• Add background rectangles behind text with adjustable opacity and padding.
• Include watermarks with adjustable size, position, and opacity.
• Custom templates for easy image generation.

Requirements

• PHP 8.2.
• Composer.
• GD library installed and enabled.
• imagine/imagine

Installation

1. Install the library using Composer:

   composer require 53ny4/og-image

2. Clone the Repository:

   git clone https://github.com/53ny4/og-image.git

3. Install Dependencies:

   Navigate to the project directory and install the required packages using Composer.

   cd og-image
   composer install

   Ensure that the imagine/imagine package is installed and available in the project.

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NOTE: only GD driver is used. Make sure that the GD library is installed and enabled in your PHP configuration.

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Usage

Basic Usage

Here's a quick example of how to generate an OG image with a solid color background, border, watermark and custom text.

<?php

require 'vendor/autoload.php';

use s3ny4\OgImage\OgImage;
use s3ny4\OgImage\OgBackground;
use s3ny4\OgImage\OgText;
use s3ny4\OgImage\OgWatermark;

// Create a new OgImage instance
$ogImage = new OgImage();

// Set background (solid color)
$ogBackground = new OgBackground('#ffffff'); // White background
$ogBackground->addBorder('bottom', 10, '#ff0000');  // 10px red border at the bottom
$ogBackground->addBorder('top', 10, '#00ff00');  // 10px green border at the top
$ogBackground->addBorder('left', 10, '#0000ff');  // 10px blue border at the left
$ogBackground->addBorder('right', 10, '#ffff00');  // 10px yellow border at the right

$ogImage->setBackground($ogBackground); // Set the background



// Add text
$ogText = new OgText();
$ogText->setText('Hello World!');
$ogText->setPosition('center', 'center');
$ogText->setColor('000000'); // Black text
$ogText->setSize(60);
$ogImage->addText($ogText); // Add the text to the image

$ogWatermark = new OgWatermark();
$ogWatermark->image('/path/to/watermark.png');
$ogWatermark->setPosition('right', 'bottom'); // Bottom right corner; x - left, right, center; y - top, bottom, center
$ogWatermark->setSize(100); // Width of 100 pixels
$ogWatermark->setOpacity(50); // 50% opacity
$ogImage->addWatermark($ogWatermark); // Add the watermark to the image

// Render and output the image
$ogImage->render(); // Output to browser

Setting Backgrounds

You can set the background of the image using a solid color or an image.

Solid Color Background

$ogBackground = new OgBackground('#ff0000'); // Red background
$ogImage->setBackground($ogBackground);

Image Background

$ogBackground = new OgBackground('/path/to/background.jpg');
$ogImage->setBackground($ogBackground);

Adding Borders

You can add borders to the background with custom width and color.

$ogBackground->addBorder('bottom', 10, '#ff0000'); // 10px red border at the bottom
$ogBackground->addBorder('top', 10, '#00ff00'); // 10px green border at the top
$ogBackground->addBorder('left', 10, '#0000ff'); // 10px blue border at the left
$ogBackground->addBorder('right', 10, '#ffff00'); // 10px yellow border at the right

Adding Text

You can add multiple text elements to the image, each with its own styling and positioning.

Text Positioning

Position the text horizontally ('left', 'center', 'right') and vertically ('top', 'center', 'bottom').

Hint: you can use pixel values for custom positioning.

$ogText->setPosition('center', 'bottom');

Text Styling

Customize the text color, size, and font.

$ogText->setColor('#ffffff'); // White text (# hashtag is optional)
$ogText->setSize(50); // Font size 50
$ogText->setFontFile('/path/to/font.ttf'); // Custom font

Background for Text

Add a background rectangle behind the text with adjustable opacity.

$ogText->setBackground('000000', 80); // Black background with 80% opacity

Adding Watermarks

Add watermark image with customizable size, position, and opacity. (can be added multiple watermarks) Watermark treated as a separate layer, so you can add multiple watermarks and they can overlap each other.

Hint: watermark can be not only used as an actual watermark, but also as a logo or any other image. Also: you can use pixel values for custom positioning.

use s3ny4\OgImage\OgWatermark;

// Create a new OgWatermark instance
$ogWatermark = new OgWatermark();
$ogWatermark->image('/path/to/watermark.png');
$ogWatermark->setPosition('right', 'bottom'); // Bottom right corner; x - left, right, center; y - top, bottom, center
$ogWatermark->setSize(100); // Width of 100 pixels
$ogWatermark->setOpacity(50); // 50% opacity

$ogImage->addWatermark($ogWatermark);

Custom Templates (How to)

Your custom templates should extend the OgImageTemplateBase.

class CustomTemplate extends OgImageTemplateBase

Then you can add your custom methods to the template with specific properties that you want to set.

public function background($color): EventTemplate
    {
        $background = new OgBackground($color);
        $background->addBorder('top', 10, 'fff000');
        $this->ogImage->setBackground($background);
        return $this;
    }

    public function title($text): EventTemplate
    {
        $titleText = new OgText();
        $titleText->setPosition('center', 'top');
        $titleText->setColor('000000');
        $titleText->setSize(50);
        $titleText->setPadding(20);
        $titleText->setText($text);
        $this->ogImage->addText($titleText);

        return $this;
    }

    public function date($date): EventTemplate
    {
        $dateText = new OgText();
        $dateText->setPosition('center', 'bottom');
        $dateText->setColor('000000');
        $dateText->setSize(30);
        $dateText->setPadding(20);
        $dateText->setText($date);
        $this->ogImage->addText($dateText);

        return $this;
    }


    public function logo($image,$size): EventTemplate
    {
        // watermark
        $watermark = new OgWatermark();
        $watermark->image($image);
        $watermark->setPosition('center', 'center');
        $watermark->setSize($size);
        $this->ogImage->addWatermark($watermark);

        return $this;
    }

And then in your code, instead of using a bunch of parameters, you can just use it like this:

require_once __DIR__ . '/vendor/autoload.php';


$ogImage = TemplateManager::registerTemplate('event', EventTemplate::class);

$ogImage
    ->background('#ffffff')
    ->title('Annual Conference 2024')
    ->date('November 1-3, 2024')
    ->logo(__DIR__ . '/assets/images/conf_logo.png', 400)
    ->render();

Result:

Full Example

Putting it all together:

<?php

require 'vendor/autoload.php';

use s3ny4\OgImage\OgImage;
use s3ny4\OgImage\OgBackground;
use s3ny4\OgImage\OgText;
use s3ny4\OgImage\OgWatermark;

// Create a new OgImage instance
$ogImage = new OgImage(1200, 630); // Custom dimensions

// Set background (image)
$ogBackground = new OgBackground('/path/to/background.jpg'); # Image background

// Set background (solid color)
// $ogBackground = new OgBackground('#ff0000'); # Red background

$ogImage->setBackground($ogBackground); # Set the background

// Add text
$ogText = new OgText();
$ogText->setText('Your Custom OG Image'); # Text
$ogText->setPosition('center', 'center'); # x - left, right, center; y - top, bottom, center
$ogText->setColor('#ffffff'); # Text color
$ogText->setSize(60); # Font size
$ogText->setBackground('000000', 50); // Semi-transparent black background
$ogText->setPadding(20); # Padding around the text
$ogImage->addText($ogText); # Add the text to the image

// Add watermark
$ogWatermark = new OgWatermark();
$ogWatermark->image('/path/to/watermark.png'); # Watermark image
$ogWatermark->setPosition('right', 'bottom'); # x - left, right, center; y - top, bottom, center
$ogWatermark->setSize(100); # Width of 100 pixels
$ogWatermark->setOpacity(80); # 80% opacity
$ogImage->addWatermark($ogWatermark); # Add the watermark to the image

// output to browser
$ogImage->render();

//or
    
// Render and output the image
// $ogImage->render('output.png');

Customization

Fonts

• Default Font: The library comes with a default font located in src/assets/fonts/.

• Custom Fonts: Use the setFontFile method to specify a custom font file.

  $ogText->setFontFile('/path/to/custom-font.ttf');

Padding and Alignment

• Vertical Padding: Adjust the vertical padding around the text using setPadding.

  $ogText->setPadding(30); // 30 pixels of vertical padding

• Text Alignment: Control the horizontal alignment ('left', 'center', 'right') and vertical alignment ( 'top', 'center', 'bottom').

  $ogText->setPosition('left', 'top');

• Text Wrapping: Set a maximum width for text wrapping using setMaxWidth.

  $ogText->setMaxWidth(800); // Wrap text at 800 pixels

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Note: Ensure all file paths are correct and that necessary assets (fonts, images) are available in the specified locations. Adjust permissions as needed to allow the script to read and write files.

Disclaimer: This library uses the GD library for image manipulation.

License

This project is licensed under the MIT License

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