计算php中文件夹中的文件数

<?php 
$directory = '/var/www/ajaxform/';
if (glob($directory . '.jpg') != false)
{
    $filecount = count(glob($directory . '*.jpg'));
    echo $filecount;
}
else
{
    echo 0;
}
?>
<?php 
$directory = '/var/www/ajaxform/';
if (g