win_whereis.php

<?php
if(count($argv) != 2) {
    exit;
}
$executable_suffixies = array("cmd", "bat", "dll", "exe");
$filename = $argv[1];
$no_suffix = !has_suffix($filename, $executable_suffixies);
$pathes = preg_split('/;/', getenv('PATH'));
foreach( $pathes as $path ) {
    echo_file_exists("$path\\$filename");
    if($no_suffix) {
        foreach($executable_suffixies as $suffix) {
            echo_file_exists("$path\\$filename.$suffix");
        }
    }
}
function has_suffix($filename, $suffixies) {
    foreach($suffixies as $suffix) {
        if(preg_match('/\.' . $suffix . '$/', $filename)) {
            return true;
        }
    }
    return false;
}
function echo_file_exists($filename) {
    if(file_exists("$filename")) {
        echo "$filename\n";
    }
}