what with grant permission do for a specific permission in mysql code example

Example 1: mysql user permission database

GRANT ALL PRIVILEGES ON `db_name`.* TO 'user'@'host'

Example 2: mysql grant

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