View difference between Paste ID: CagwpVNH and J5CyKrZV

 <?php
 /*
 Plugin Name: Change The Role
 Plugin URI: https://ja.forums.wordpress.org/topic/141608
 Version: 0.1a.20141031
 Author: mizube
 Author URI: https://ja.forums.wordpress.org/profile/419438
 Text Domain: change-the-role
 Domain Path: /languages/
 Description: Enables users to change the user role in some roles.
 */
 
-add_action( 'plugins_loaded', array( 'EnableRoleChange', '__boot' ) );
+add_action( 'plugins_loaded', array( 'ChangeTheRole', '__boot' ) );
-register_deactivation_hook( __FILE__, array( 'EnableRoleChange', 'deactivated' ) );
+register_deactivation_hook( __FILE__, array( 'ChangeTheRole', 'deactivated' ) );
 
-class EnableRoleChange {
+class ChangeTheRole {
 
 	public $textdomain = 'change-the-role';
 
 	public static function __boot() {
 		$class = __CLASS__;
 		new $class();
 	}
 
 	public function __construct() {
 		load_plugin_textdomain( $this->textdomain, false, basename( dirname( __FILE__ ) ) . '/languages/' );
 
 		add_action( 'personal_options_update', array( $this, 'action_personal_options_update' ) );
 		add_action( 'personal_options', array( $this, 'action_personal_options' ) );
 		add_action( 'admin_init', array( $this, 'action_admin_init' ) );
 	}
 
 	public function action_personal_options_update( $user_id ) {
 		if ( !$user_id || !isset( $_POST['erc_role'] ) || !current_user_can( 'edit_user', $user_id ) )
 			return;
 
 		$erc_roles = get_option( 'erc_changeable_roles', array() );
 		$erc_role  = sanitize_text_field( $_POST['erc_role'] );
 
 		if ( !in_array( $erc_role, $erc_roles ) )
 			return;
 
 		$user_roles = get_userdata( $user_id )->roles;
 		$has_roles  = false;
 
 		foreach ( $user_roles as $user_role ) {
 			if ( in_array( $user_role, $erc_roles ) ) {
 				$has_roles = true;
 				break;
 			}
 		}
 
 		if ( !$has_roles ) return;
 
 		$wp_user = new WP_User( $user_id );
 		$wp_user->set_role( $erc_role );
 		unset( $wp_user );
 	}
 
 	public function action_personal_options( $profileuser ) {
 		global $wp_roles;
 
 		$role_names = $wp_roles->get_names();
 		$erc_roles  = get_option( 'erc_changeable_roles', array() );
 		$has_roles  = false;
 
 		foreach ( $profileuser->roles as $user_role ) {
 			if ( in_array( $user_role, $erc_roles ) ) {
 				$has_roles = true;
 				break;
 			}
 		}
 
 		if ( !empty( $erc_roles ) && $has_roles && !current_user_can( 'edit_users' ) ) {
 			echo '<table class="form-table"><tr><th scope="row"><label for="erc_role">' . __( 'Role' ) . '</label></th><td>';
 			echo '<select name="erc_role" id="erc_role">';
 			foreach ( $erc_roles as $role ) {
 				echo '<option value="' . $role . '"'
 					. selected( in_array( $role, $profileuser->roles ), true, false ) . '>'
 					. translate_user_role( $role_names[$role] ) . '</option>';
 			}
 			echo '</select>';
 			echo '</td></tr></table>';
 		}
 	}
 
 	public function action_admin_init() {
 		add_settings_field(
 			'erc_changeable_roles',
 			__( 'Changeable Roles', $this->textdomain ),
 			array( $this, 'callback_render_roles_list' ),
 			'general',
 			'default'
 		);
 		register_setting( 'general', 'erc_changeable_roles' );
 	}
 
 	public function callback_render_roles_list() {
 		global $wp_roles;
 		$roles  = $wp_roles->get_names();
 		$option = get_option( 'erc_changeable_roles', array() );
 		echo '<ul>';
 		foreach ( $roles as $role => $label ) {
 			if( isset( $wp_roles->roles[$role]['capabilities']['manage_options'] ) ) continue;
 			echo '<li><label><input type="checkbox" name="erc_changeable_roles[]" value="' . $role . '" '
 				. checked( in_array( $role, $option ), true, false ) . ' /> '
 				. translate_user_role( $label ) . '</label></li>';
 		}
 		echo '</ul>';
 	}
 
-	public function deactivated() {
+	public static function deactivated() {
 		delete_option( 'erc_changeable_roles' );
 	}
 }