PHP determines whether the directory file exists

A simple piece of PHP to judge whether there is code in the directory file , save it and record it, it will definitely be used in the future.

<?php
$filename = '../../e/install/';

if (file_exists($filename)) {
    echo "<h3><div align='center'><font color='#FF0000'>存在安全风险！请将 $filename 文件夹删除或改名！</font></div></h3>";
} else {
    echo "<h3><div align='center'><font color='#FF0000'> (☆_☆)文件夹 $filename 以删除或改名  (☆_☆)</font></div></h3>";
}
?>