PHP srand函数代码示例

 function quoteFromDir($dir)
 {
     $amount = 0;
     $index = 0;
     if ($handle = opendir($dir)) {
         while (false !== ($file = readdir($handle))) {
             if (strpos($file, ".dat") != false) {
                 $len = strlen($file);
                 if (substr($file, $len - 4) == ".dat") {
                     $number = $this->getNumberOfQuotes($dir . "/" . $file);
                     $amount += $number;
                     $quotes[$index] = $amount;
                     $files[$index] = $file;
                     $index++;
                 }
             }
         }
         srand((double) microtime() * 1000000);
         $index = rand(0, $amount);
         $i = 0;
         while ($quotes[$i] < $index) {
             $i++;
         }
         return $this->getRandomQuote($dir . "/" . $files[$i]);
     }
     return -1;
 }

function create_captcha($width = 60, $height = 32)
{
    session_start();
    //生成验证码图片
    Header("Content-type: image/PNG");
    $im = imagecreate($width, $height);
    // width and height of image
    $back = ImageColorAllocate($im, 245, 245, 245);
    // specify background color
    imagefill($im, 0, 0, $back);
    // fill the background color into image
    $vcodes = "";
    srand((double) microtime() * 1000000);
    //生成4位数字
    for ($i = 0; $i < 4; $i++) {
        $font = ImageColorAllocate($im, rand(100, 255), rand(0, 100), rand(100, 255));
        // 生成随机颜色
        $authnum = rand(1, 9);
        $vcodes .= $authnum;
        imagestring($im, 5, 2 + $i * 10, 1, $authnum, $font);
    }
    for ($i = 0; $i < 100; $i++) {
        // interuppting
        $randcolor = ImageColorallocate($im, rand(0, 255), rand(0, 255), rand(0, 255));
        imagesetpixel($im, rand() % 70, rand() % 30, $randcolor);
        // 画像素点函数
    }
    ImagePNG($im);
    ImageDestroy($im);
    $_SESSION['captcha'] = $vcodes;
}

 function check($text)
 {
     $this->errors = array();
     $this->command = '';
     if (preg_match('/^([0-9]+)d([0-9]{1,3})([\\+-][0-9]+)?$/', $text, $matches)) {
         $this->command['launch'] = (int) $matches[1];
         $this->command['faces'] = (int) $matches[2];
         // Now go for corrections
         if (count($matches) == 4) {
             $this->command['bias'] = $matches[3];
         }
         if (!($this->command['launch'] && $this->command['faces'])) {
             //print_r($matches);
             $this->errors[] = "Be serious, not null dice please.";
             return false;
         }
     } else {
         //print_r($matches);
         // Too long
         //$this->errors[] = "'$text' is not a valid string for a dice launch. Valid strings match the following patterns xdyyy, xdyyy+z or xdyyy-z where x,  y and z are digits, you can have up to three y.";
         $this->errors[] = 'Not valid. Valid launches are like xdyyy';
         return false;
     }
     $this->text = $text;
     srand((double) microtime() * 1000000);
     return true;
 }

/**
 * Generates a Photon URL.
 *
 * @see http://developer.wordpress.com/docs/photon/
 *
 * @param string $image_url URL to the publicly accessible image you want to manipulate
 * @param array|string $args An array of arguments, i.e. array( 'w' => '300', 'resize' => array( 123, 456 ) ), or in string form (w=123&h=456)
 * @return string The raw final URL. You should run this through esc_url() before displaying it.
 */
function jetpack_photon_url($image_url, $args = array(), $scheme = null)
{
    $image_url = trim($image_url);
    $image_url = apply_filters('jetpack_photon_pre_image_url', $image_url, $args, $scheme);
    $args = apply_filters('jetpack_photon_pre_args', $args, $image_url, $scheme);
    if (empty($image_url)) {
        return $image_url;
    }
    $image_url_parts = @parse_url($image_url);
    // Unable to parse
    if (!is_array($image_url_parts) || empty($image_url_parts['host']) || empty($image_url_parts['path'])) {
        return $image_url;
    }
    if (is_array($args)) {
        // Convert values that are arrays into strings
        foreach ($args as $arg => $value) {
            if (is_array($value)) {
                $args[$arg] = implode(',', $value);
            }
        }
        // Encode values
        // See http://core.trac.wordpress.org/ticket/17923
        $args = rawurlencode_deep($args);
    }
    // You can't run a Photon URL through Photon again because query strings are stripped.
    // So if the image is already a Photon URL, append the new arguments to the existing URL.
    if (in_array($image_url_parts['host'], array('i0.wp.com', 'i1.wp.com', 'i2.wp.com'))) {
        $photon_url = add_query_arg($args, $image_url);
        return jetpack_photon_url_scheme($photon_url, $scheme);
    }
    // This setting is Photon Server dependent
    if (!apply_filters('jetpack_photon_any_extension_for_domain', false, $image_url_parts['host'])) {
        // Photon doesn't support query strings so we ignore them and look only at the path.
        // However some source images are served via PHP so check the no-query-string extension.
        // For future proofing, this is a blacklist of common issues rather than a whitelist.
        $extension = pathinfo($image_url_parts['path'], PATHINFO_EXTENSION);
        if (empty($extension) || in_array($extension, array('php'))) {
            return $image_url;
        }
    }
    $image_host_path = $image_url_parts['host'] . $image_url_parts['path'];
    // Figure out which CDN subdomain to use
    srand(crc32($image_host_path));
    $subdomain = rand(0, 2);
    srand();
    $photon_url = "http://i{$subdomain}.wp.com/{$image_host_path}";
    // This setting is Photon Server dependent
    if (isset($image_url_parts['query']) && apply_filters('jetpack_photon_add_query_string_to_domain', false, $image_url_parts['host'])) {
        $photon_url .= '?q=' . rawurlencode($image_url_parts['query']);
    }
    if ($args) {
        if (is_array($args)) {
            $photon_url = add_query_arg($args, $photon_url);
        } else {
            // You can pass a query string for complicated requests but where you still want CDN subdomain help, etc.
            $photon_url .= '?' . $args;
        }
    }
    return jetpack_photon_url_scheme($photon_url, $scheme);
}

 private function _reset()
 {
     $db = Database::instance();
     // Drop all tables
     foreach ($db->list_tables() as $table) {
         $db->query("DROP TABLE IF EXISTS `{$table}`");
     }
     // Clean out data
     dir::unlink(VARPATH . "uploads");
     dir::unlink(VARPATH . "albums");
     dir::unlink(VARPATH . "resizes");
     dir::unlink(VARPATH . "thumbs");
     dir::unlink(VARPATH . "modules");
     dir::unlink(VARPATH . "tmp");
     $db->clear_cache();
     module::$modules = array();
     module::$active = array();
     // Use a known random seed so that subsequent packaging runs will reuse the same random
     // numbers, keeping our install.sql file more stable.
     srand(0);
     gallery_installer::install(true);
     module::load_modules();
     foreach (array("user", "comment", "organize", "info", "rss", "search", "slideshow", "tag") as $module_name) {
         module::install($module_name);
         module::activate($module_name);
     }
 }

 function _create_media_record($tmp_file_path, $file_name, $mime_type)
 {
     if (!file_exists($tmp_file_path)) {
         debug::write_error('tmp file not found', __FILE__ . ' : ' . __LINE__ . ' : ' . __FUNCTION__, array('tmp_file' => $tmp_file_path));
         return false;
     }
     srand(time());
     $media_id = md5(uniqid(rand()));
     dir::mkdir(MEDIA_DIR);
     if (!copy($tmp_file_path, MEDIA_DIR . $media_id . '.media')) {
         debug::write_error('copy failed', __FILE__ . ' : ' . __LINE__ . ' : ' . __FUNCTION__, array('dst' => MEDIA_DIR . $media_id . '.media', 'src' => $tmp_file_path));
         return false;
     }
     if (function_exists('md5_file')) {
         $etag = md5_file($tmp_file_path);
     } else {
         $fd = fopen($tmp_file_path, 'rb');
         $contents = fread($fd, filesize($tmp_file_path));
         fclose($fd);
         $etag = md5($contents);
     }
     $media_db_table = db_table_factory::instance('media');
     $media_db_table->insert(array('id' => $media_id, 'file_name' => $file_name, 'mime_type' => $mime_type, 'size' => filesize($tmp_file_path), 'etag' => $etag));
     $this->set_attribute('etag', $etag);
     return $media_id;
 }

 function seed()
 {
     if ($this->makeMoreRandom) {
         usleep(1);
         srand((double) microtime() * 1000000);
     }
 }

function tpl_function_adsense($params, &$tpl)
{
    // check to make sure this is a full story
    if (strcasecmp(pagename, "story") != 0) {
        // not a full story, no adsense sharing
        $tpl->assign($params['assign'], 0);
        return;
    }
    // check to see if the author has an adsense id on their profile
    if ($tpl->get_template_vars("google_adsense_id") == "") {
        // this author hasn't provided their adsense id, no sharing
        $tpl->assign($params['assign'], 0);
        return;
    }
    // make sure the logged in user isn't the same user who submitted the story
    // using a case insensitive compare because the user name isn't case sensitive
    if (strcasecmp($tpl->get_template_vars("user_logged_in"), $tpl->get_template_vars("link_submitter")) == 0) {
        // the user viewing the story is also the author, can't show them their own ads, no sharing
        $tpl->assign($params['assign'], 0);
        return;
    }
    // generate a random number between 1 and 100
    srand((double) microtime() * 10000000);
    $random = rand(1, 100);
    // check the random number against their adsense percent (defaults to 50% but can be adjusted)
    if ($random > $tpl->get_template_vars("google_adsense_percent")) {
        // if the random number is higher than their percent of revenue sharing, no sharing this time
        $tpl->assign($params['assign'], 0);
        return;
    }
    // passed all checks, use the users adsense ID for this page
    $tpl->assign($params['assign'], 1);
    return;
}

function generate_code()
{
    $hours = date("H");
    // час
    $minuts = substr(date("H"), 0, 1);
    // минута
    $mouns = date("m");
    // месяц
    $year_day = date("z");
    // день в году
    $str = $hours . $minuts . $mouns . $year_day;
    //создаем строку
    $str = md5(md5($str));
    //дважды шифруем в md5
    $str = strrev($str);
    // реверс строки
    $str = substr($str, 3, 6);
    // извлекаем 6 символов, начиная с 3
    // Вам конечно же можно постваить другие значения, так как, если взломщики узнают, каким именно способом это все генерируется, то в защите не будет смысла.
    $array_mix = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);
    srand((double) microtime() * 1000000);
    shuffle($array_mix);
    //Тщательно перемешиваем, соль, сахар по вкусу!!!
    return implode("", $array_mix);
}

 public function __construct($seed = null)
 {
     if ($seed === null) {
         $seed = time();
     }
     srand($seed);
 }

function insert_user($added_name, $password, $gradyear, $email, $type, $status = '')
{
    if (!$password) {
        srand(time());
        $password = rand(0, 999999);
    }
    if (!$email) {
        $email = $added_name . "@grinnell.edu";
    }
    $crpassword = User::hashPassword($password);
    $dbh = db_connect();
    $myrow = array("", $added_name, "", $crpassword, $email, "", "", "", "", "", "", $gradyear, "70", "14", "", "", $type, "", "", 0);
    add_row($dbh, "accounts", $myrow);
    mysql_query("UPDATE accounts SET created = NOW() WHERE\n\t\t\tusername = '{$added_name}'");
    $added_id = get_item($dbh, "userid", "accounts", "username", $added_name);
    mysql_query("INSERT INTO plans (user_id) VALUES ({$added_id})");
    add_row($dbh, "display", array($added_id, "6", "7"));
    foreach (array(2, 4, 6, 8, 14, 15, 16) as $opt_link) {
        $myrow = array($added_id, $opt_link);
        add_row($dbh, "opt_links", $myrow);
    }
    $myrow = array($added_id, $status);
    add_row($dbh, "perms", $myrow);
    return array($password, $email);
}

 protected function post_id_reset_handler()
 {
     $newpass = '';
     srand();
     for ($i = 0; $i < 8; $i++) {
         switch (rand(1, 3)) {
             case 1:
                 // digit
                 $newpass .= chr(48 + rand(0, 9));
                 break;
             case 2:
                 // uppercase
                 $newpass .= chr(65 + rand(0, 25));
                 break;
             case 3:
                 $newpass .= chr(97 + rand(0, 25));
                 break;
         }
     }
     $changed = changeAnyPassword($this->id, $newpass);
     if ($changed) {
         $this->add_onload_command("showBootstrapAlert('#btn-bar', 'success', 'New password for {$this->id} is {$newpass}');\n");
     } else {
         $this->add_onload_command("showBootstrapAlert('#btn-bar', 'danger', 'Error changing password for {$this->id}');\n");
     }
     return true;
 }

 /**
  * Constructor.
  *
  * @param BASE_CommentsParams $params
  */
 public function __construct(BASE_CommentsParams $params)
 {
     parent::__construct();
     $this->params = $params;
     $this->batchData = $params->getBatchData();
     $this->staticData = empty($this->batchData['_static']) ? array() : $this->batchData['_static'];
     $this->batchData = isset($this->batchData[$params->getEntityType()][$params->getEntityId()]) ? $this->batchData[$params->getEntityType()][$params->getEntityId()] : array();
     srand(time());
     $this->id = $params->getEntityType() . $params->getEntityId() . rand(1, 10000);
     $this->cmpContextId = "comments-{$this->id}";
     $this->assign('cmpContext', $this->cmpContextId);
     $this->assign('wrapInBox', $params->getWrapInBox());
     $this->assign('topList', in_array($params->getDisplayType(), array(BASE_CommentsParams::DISPLAY_TYPE_WITH_LOAD_LIST, BASE_CommentsParams::DISPLAY_TYPE_WITH_LOAD_LIST_MINI)));
     $this->assign('bottomList', $params->getDisplayType() == BASE_CommentsParams::DISPLAY_TYPE_WITH_PAGING);
     $this->assign('mini', $params->getDisplayType() == BASE_CommentsParams::DISPLAY_TYPE_WITH_LOAD_LIST_MINI);
     $this->isAuthorized = OW::getUser()->isAuthorized($params->getPluginKey(), 'add_comment') && $params->getAddComment();
     if (!$this->isAuthorized) {
         $errorMessage = $params->getErrorMessage();
         if (empty($errorMessage)) {
             $status = BOL_AuthorizationService::getInstance()->getActionStatus($params->getPluginKey(), 'add_comment');
             $errorMessage = OW::getUser()->isAuthenticated() ? $status['msg'] : OW::getLanguage()->text('base', 'comments_add_login_message');
         }
         $this->assign('authErrorMessage', $errorMessage);
     }
     $this->initForm();
 }

 function cc_bill($cc_info, $member, $amount, $currency, $product_description, $charge_type, $invoice, $payment)
 {
     global $config;
     $log = array();
     //////////////////////// cc_bill /////////////////////////
     srand(time());
     if ($cc_info['cc_name_f'] == '') {
         $cc_info['cc_name_f'] = $member['name_f'];
         $cc_info['cc_name_l'] = $member['name_l'];
     }
     $vars = array("merchant" => $this->config['login'], "ticket" => $payment['payment_id'], "amount" => $amount, "card" => $cc_info['cc_number'], "expdate" => $cc_info['cc-expire'], "cardname" => $cc_info['cc_name_f'] . " " . $cc_info['cc_name_l'], "address" => $cc_info['cc_street'], "zip" => $cc_info['cc_zip'], "authenticator" => md5($this->config['secret'] . $this->config['login'] . $payment[payment_id] . $amount));
     if ($cc_info['cc_code']) {
         $vars['cvd'] = $cc_info['cc_code'];
     }
     // prepare log record
     $vars_l = $vars;
     $vars_l['card'] = $cc_info['cc'];
     if ($vars['cvd']) {
         $vars_l['cvd'] = preg_replace('/./', '*', $vars['cvd']);
     }
     $log[] = $vars_l;
     /////
     $res = $this->run_transaction($vars);
     $log[] = $res;
     if (preg_match("/Approved/i", $res[RESULT])) {
         return array(CC_RESULT_SUCCESS, "", $res['PNREF'], $log);
     } elseif (preg_match("/Declined/i", $res[RESULT])) {
         return array(CC_RESULT_DECLINE_PERM, $res['RESPMSG'] ? $res[RESPMSG] : $res[RESULT], "", $log);
     } else {
         return array(CC_RESULT_INTERNAL_ERROR, $res['RESPMSG'] ? $res[RESPMSG] : $res[RESULT], "", $log);
     }
 }

 function sendnewpassword($mail)
 {
     global $lang;
     $ExistMail = doquery("SELECT `email` FROM {{table}} WHERE `email` = '" . $mail . "' LIMIT 1;", 'users', true);
     if (empty($ExistMail['email'])) {
         message($lang['mail_not_exist'], "index.php?modo=claveperdida", 2, false, false);
     } else {
         $Caracters = "aazertyuiopqsdfghjklmwxcvbnAZERTYUIOPQSDFGHJKLMWXCVBN1234567890";
         $Count = strlen($Caracters);
         $NewPass = "";
         $Taille = 6;
         srand((double) microtime() * 1000000);
         for ($i = 0; $i < $Taille; $i++) {
             $CaracterBoucle = rand(0, $Count - 1);
             $NewPass = $NewPass . substr($Caracters, $CaracterBoucle, 1);
         }
         $Title = $lang['mail_title'];
         $Body = $lang['mail_text'];
         $Body .= $NewPass;
         mail($mail, $Title, $Body);
         $NewPassSql = md5($NewPass);
         $QryPassChange = "UPDATE {{table}} SET ";
         $QryPassChange .= "`password` ='" . $NewPassSql . "' ";
         $QryPassChange .= "WHERE `email`='" . $mail . "' LIMIT 1;";
         doquery($QryPassChange, 'users');
     }
 }