search for twitter user_id | reference: http://stabucky.com/wp/archives/2188

get_user_id.php

<?php

$a = array(0,1,2,3,4,5,6,7,8,9);
$b = 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');
$c = array('_');
$x = array_merge($a,$b,$c);

function userId($arr, $length = 4){
    $max = count($arr);
    if ($max < $length) {
        return;
    } elseif ($length == 1) {
        for ($i=0; $i<$max; $i++) {
            $keys[$i] = array($arr[$i]);
        }
    } elseif ($length > 1) {
        $j = 0;
        for ($i=0; $i<$max-$length+1; $i++) {
            $ts = userId(array_slice($arr, $i+1), $length-1);
            foreach ($ts as $t) {
                array_unshift($t, $arr[$i]);
                $keys[$j] = $t;
                $j++;
            }
        }
    }
    return $keys;
}

$keys = userId($x, 4);
foreach ($keys as $key) {
	$id = implode($key);
	echo "{$id}\n";
}

tw_user_id.php

<?php

$a = array(0,1,2,3,4,5,6,7,8,9);
$b = 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');
$c = array('_');
$x = array_merge($a,$b,$c);

date_default_timezone_set('Asia/Tokyo');
mb_language('Japanese');
ini_set('error_reporting', E_ALL);
ini_set('display_errors', 1);

define('PATH', dirname(__FILE__).'/');
define('FILE_NAME', PATH . 'file/userlist.txt');
define('TW_USER_BASEURL', 'https://twitter.com/');


function userId($arr, $length = 4){
    $max = count($arr);
    if ($max < $length) {
        return;
    } elseif ($length == 1) {
        for ($i=0; $i<$max; $i++) {
            $keys[$i] = array($arr[$i]);
        }
    } elseif ($length > 1) {
        $j = 0;
        for ($i=0; $i<$max-$length+1; $i++) {
            $ts = userId(array_slice($arr, $i+1), $length-1);
            foreach ($ts as $t) {
                array_unshift($t, $arr[$i]);
                $keys[$j] = $t;
                $j++;
            }
        }
    }
    return $keys;
}



$userlist = file_get_contents(FILE_NAME);

$fp = fopen(FILE_NAME, 'r+');

$keys = userId($x, 4);
foreach ($keys as $key) {
    $id  = implode($key);

    $url = TW_USER_BASEURL.$id;

    $pos = strpos($userlist, $url);
    if ($pos === false) {
        $html = @file_get_contents($url);
        if (empty($html)) {
            $fields = array($url, 'no');
            fputcsv($fp, $fields);
        }
    }
    sleep(1);
}

fclose($fp);