how to check file exist in php using only extension like (*.pdf)

Question

$filename = '/www/test1/*.pdf';
    if (file_exists($filename)) 
    {
        echo "The file $filename exists";
    } 
    else
    {
        echo "The file $filename does not exist";
    }

I used above code but it checks for *.pdf file but not for all files belongs to .pdf extension

Answer 1

$filename = '/www/test1/*.pdf';
if (count(glob($filename)) > 0) {
    echo "The file $filename exists";
} else {
    echo "The file $filename does not exist";
}