Database not reading current sessions - php

Question

I have the following code and database table that at one point worked perfect together. If a user was on my site, the database would show those users.
I have the session class conjoint with an ini file that I require on every page of my site, so the session is always running.
I have the same code on another site of mine and this is where I brought the code over from, but one time a user was on it and it seems like the database table froze and up to this day, it still shows that user having a session, but if I go on it or anyone else, it doesn't show.
Does anyone see anything in the following that could be wrong?
CREATE TABLE `groups` (
`id` int(11) NOT NULL,
`name` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
`permissions` text COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci
Session class
class Session {
public static function exists($name) {
return (isset($_SESSION[$name])) ? true : false;
}
public static function put($name, $value) {
return $_SESSION[$name] = $value;
}
public static function get($name) {
return $_SESSION[$name];
}
public static function delete($name) {
if(self::exists($name)) {
unset($_SESSION[$name]);
}
}
public static function flash($name, $string = '') {
if(self::exists($name)) {
$session = self::get($name);
self::delete($name);
return $session;
} else {
self::put($name, $string);
}
}
}
Here's part of my db class..
public function action($action, $table, $where = array()){
if(count($where) === 3){
$operators = array('=', '>', '<', '>=', '<=');
$field = $where[0];
$operator = $where[1];
$value = $where[2];
if(in_array($operator, $operators)) {
$sql = "{$action} FROM {$table} WHERE {$field} {$operator} ?";
if(!$this->query($sql, array($value))->error()) {
return $this;
}
}
}
return false;
}
public function get($table, $where){
return $this->action('SELECT *', $table, $where);
}
public function delete($table, $where){
return $this->action('DELETE', $table, $where);
}
public function insert($table, $fields = array()) {
$keys = array_keys($fields);
$values = '';
$x = 1;
foreach($fields as $field) {
$values .= '?';
if($x < count($fields)) {
$values .= ', ';
}
$x++;
}
$sql = "INSERT INTO {$table} (`" . implode('`, `', $keys) . "`) Values ({$values})";
return ! $this-> query($sql, $fields)->error();
}
public function update($table, $id, $fields) {
$set = '';
$x = 1;
foreach($fields as $name => $value) {
$set .= "{$name} = ?";
if($x < count($fields)) {
$set .= ', ';
}
$x++;
}
$sql = "UPDATE {$table} SET {$set} WHERE id = {$id}";
return ! $this-> query($sql, $fields)->error();
}
public function results() {
return $this->_results;
}
public function first() {
return $this->results()[0];
}
public function error() {
return $this->_error;
}
public function errorMessage() {
return $this->_errmsg;
}
public function count(){
return $this->_count;
}
}