<?php

$dir = "cargas/";

// Open a known directory, and proceed to read its contents
if (is_dir($dir)) {
if ($dh = opendir($dir)) {
    while (($file = readdir($dh)) !== false) {
        if($file == $_POST['pdfabuscar']){
            echo('<a href="'.$dir . $file.'">'. $file .'</a>'."n");
        }
    }
    closedir($dh);
}
}