How to add custom field under WordPress general settings

To add custom fields under WordPress general settings without hacking core code, use the below example. Here’s how to add custom field under WordPress general settings page.

add_filter('admin_init', 'register_my_general_settings_fields');
function register_my_general_settings_fields()
{
register_setting('general', 'custom_field', 'esc_attr');
add_settings_field('custom_field', '<label for="custom_field">'.__('Custom Field' , 'custom_field' ).'</label>' , 'general_settings_custom_fields_html', 'general');
}

function general_settings_custom_fields_html()
{
$value = get_option( 'custom_field', '' );
echo '<input type="text" id="custom_field" name="custom_field" value="' . $value . '" />';
}

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