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Mini Shell
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<?php
namespace AC;
abstract class Preferences {
/**
* @var int
*/
private $user_id;
/**
* The label for this set of preferences
* @var string
*/
private $label;
/**
* Preferences of this user
* @var array
*/
protected $data = [];
/**
* Retrieves data from DB
* return array|false
*/
abstract protected function load();
/**
* Stores data to DB
* @return bool
*/
abstract public function save();
/**
* @param string $label
* @param null|int $user_id
*/
public function __construct( $label, $user_id = null ) {
if ( null === $user_id ) {
$user_id = get_current_user_id();
}
$this->user_id = intval( $user_id );
$this->label = sanitize_key( (string) $label );
$data = $this->load();
if ( is_array( $data ) ) {
foreach ( $data as $k => $v ) {
$this->set( $k, $v, false );
}
}
}
/**
* Return the key used to store and retrieve this preference
* @return string
*/
protected function get_key() {
return 'ac_preferences_' . $this->label;
}
/**
* @return int
*/
protected function get_user_id() {
return $this->user_id;
}
/**
* @param string $key
*
* @return mixed|null
*/
public function get( $key ) {
if ( ! isset( $this->data[ $key ] ) ) {
return null;
}
return $this->data[ $key ];
}
/**
* @param string $key
* @param mixed $data
* @param bool $save Immediately save changes to database
*
* @return bool
*/
public function set( $key, $data, $save = true ) {
$this->data[ $key ] = $data;
if ( $save ) {
return $this->save();
}
return true;
}
/**
* @param string $key
* @param bool $save Immediately save changes to database
*
* @return bool
*/
public function delete( $key, $save = true ) {
if ( null === $this->get( $key ) ) {
return false;
}
unset( $this->data[ $key ] );
if ( $save ) {
return $this->save();
}
return true;
}
/**
* Reset site preferences for all users that match on the current label
*/
public function reset_for_all_users() {
if ( empty( $this->label ) ) {
return false;
}
global $wpdb;
$sql = "
DELETE
FROM {$wpdb->usermeta}
WHERE meta_key LIKE %s
";
$sql = $wpdb->prepare( $sql, $wpdb->esc_like( $wpdb->get_blog_prefix() . $this->get_key() ) . '%' );
return (bool) $wpdb->query( $sql );
}
}
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