protected function _checkMemoryLimit()
{
$memlimit = trim(ini_get('memory_limit'));
switch (strtolower(substr($memlimit, -1))) {
case 'g':
$memlimit *= 1024;
// Fall-through
// Fall-through
case 'm':
$memlimit *= 1024;
// Fall-through
// Fall-through
case 'k':
$memlimit *= 1024;
// Fall-through
}
return $memlimit < 67108864;
}