<?php

// submit query to search engine
$url_contents = "http://www.google.com/search?q=".urlencode($_POST['query']);

$query_file_content = file_get_contents($url_contents, "r") or die("cannot open url");

// save results to a local file
// depending on how your server is configured you may need to give queryfiles folder 777 permission
// could aslo use another file mode to create file i.e. w+
$file = fopen('queryfiles/'.$_POST['filename'], 'w+');

fwrite ($file, $query_file_content);

fclose($file);

<?php

// regular expression <\s*a\s+[^>]*href\s*=\s*[\"']?([^\"' >]+)[\"' >]

$href_regex ="<"; // 1 start of the tag
$href_regex .="\s*"; // 2 zero or more whitespace
$href_regex .="a"; // 3 the a of the tag itself
$href_regex .="\s+"; // 4 one or more whitespace
$href_regex .="[^>]*"; // 5 zero or more of any character that is _not_ the end of the tag
$href_regex .="href"; // 6 the href bit of the tag
$href_regex .="\s*"; // 7 zero or more whitespace
$href_regex .="="; // 8 the = of the tag

<?php
// downloading a file use http://somewhere.com/download.php/?filename=name of file

$filename = $_GET['filename'];

if(!$filename){ echo "ERROR: No filename specified. Please try again."; }
else {

// fix for IE catching or PHP bug issue
header("Pragma: public");
header("Expires: 0"); // set expiration time
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
// browser must download file from server instead of cache

// force download dialog
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");


<?php
$let=array(
"a","b","c","d","e","f","g","h","i",
"j","k","l","m","n","o","p","q","r",
"s","t","u","v","w","x","y","z"
);