the php gd extension is required but is not installed. windows code example

Example: gd library extension not available with this php installation

The GD Graphics Library is for dynamically manipulating images. For Ubuntu
  you should install it manually:

1. check your php version : php -v

2. Run one of the command according to your php verison
  
PHP5: sudo apt-get install php5-gd
PHP7.0: sudo apt-get install php7.0-gd
PHP7.1: sudo apt-get install php7.1-gd
PHP7.2: sudo apt-get install php7.2-gd
PHP7.3: sudo apt-get install php7.3-gd
PHP7.4: sudo apt-get install php7.4-gd

3. Thats all, you can verify that GD support loaded:
 php -i | grep -i gd

Output should be like this:

GD Support => enabled
GD headers Version => 2.1.1-dev
gd.jpeg_ignore_warning => 0 => 0

4. Restart your apache service :
sudo service apache2 restart

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Php Example