cache.php

<?php //var_dump(opcache_get_status()); exit(); phpinfo(); exit();

include 'vendor/autoload.php';

use phpFastCache\CacheManager;

$dsn = 'mysql:dbname=employees;host=127.0.0.1';
$user = 'root';
$password = '$ecR3t';

$sql = "
/*qc=off*/ SELECT emp.first_name, emp.last_name, emp.birth_date, dep.dept_name
  FROM dept_emp 
  JOIN employees emp ON dept_emp.emp_no = emp.emp_no
  JOIN departments dep ON dep.dept_no = dept_emp.dept_no
 WHERE dept_emp.to_date < '9999-01-01'";

try {
    $dbh = new PDO($dsn, $user, $password);
    //$sth = $dbh->prepare($sql);
    //$sth->execute();
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

CacheManager::setDefaultConfig(array(
    "path" => '/tmp',
));

$InstanceCache = CacheManager::getInstance('files');

//if (isset($_GET['cache_clear'])) {
//    $InstanceCache->clear();
//}

$key = "employees";
$CachedString = $InstanceCache->getItem($key);

$time_start = microtime(true);
if (is_null($CachedString->get())) {
    $sth = $dbh->prepare($sql);
    $sth->execute();
    $data = $sth->fetchAll(PDO::FETCH_ASSOC);

    $CachedString->set($data)->expiresAfter(3600);
    $saveres = $InstanceCache->save($CachedString);
    var_dump($saveres);

    echo "FIRST LOAD";

} else {
    echo "READ FROM CACHE";
    $out = $CachedString->get();
}
$time_end = microtime(true);

//echo strlen(print_r($out,true));


$execution_time = ($time_end - $time_start);
echo '<br><br><br><b>'.sprintf('%.12f', $execution_time).' s</b>';