what is with grant option mysql code example

Example 1: mysql grant grant option

GRANT ALL ON *.* TO 'user'@'localhost';

GRANT GRANT OPTION ON *.* TO 'user'@'localhost';

Example 2: mysql grant

if(curl_exec($ch) === false)
{
    echo 'Curl error: ' . curl_error($ch);
}
else
{
    echo 'Operation completed without any errors';