public function __construct()
{
if (self::$instancesCount++ >= 5) {
throw new Exception(sprintf('Only %d instances of ' . __CLASS__ . ' are allowed', self::MAX_INSTANCES));
}
}
/* public function getInstancesCount()
{
return self::$instancesCount;
} */
public static function getInstancesCount()
{
return self::$instancesCount;
}
}
$i1 = new InstanceCounter();
//echo $i1->getInstancesCount(), PHP_EOL;
echo InstanceCounter::getInstancesCount(), PHP_EOL;
$i2 = new InstanceCounter();
//echo $i2->getInstancesCount(), PHP_EOL;
echo InstanceCounter::getInstancesCount(), PHP_EOL;
$i3 = new InstanceCounter();
// echo $i3->getInstancesCount(), PHP_EOL;
echo InstanceCounter::getInstancesCount(), PHP_EOL;
$i4 = new InstanceCounter();
//echo $i4->getInstancesCount(), PHP_EOL;
echo InstanceCounter::getInstancesCount(), PHP_EOL;
$i5 = new InstanceCounter();
//echo $i5->getInstancesCount(), PHP_EOL;
echo InstanceCounter::getInstancesCount(), PHP_EOL;
var_dump([$i1->getInstancesCount(), $i2->getInstancesCount(), $i3->getInstancesCount(), $i4->getInstancesCount(), $i5->getInstancesCount()]);
<?php
class InstanceCounter
{
const MAX_INSTANCES = 5;
private static $instacesCount = 0;
public function __construct()
{
if (self::getInstancesCount() >= self::MAX_INSTANCES) {
throw new Exception('Max instances count reached');
}
self::$instacesCount++;
}
public static function getInstancesCount()
{
return self::$instacesCount;
}
}
new InstanceCounter();
new InstanceCounter();
new InstanceCounter();
new InstanceCounter();
new InstanceCounter();
var_dump(InstanceCounter::getInstancesCount());
