02. Email Censorship

<?php
$text = $_GET['text'];
$blacklist = $_GET['blacklist'];
$blacklist = preg_split("/\s/", $blacklist, -1, PREG_SPLIT_NO_EMPTY);

//$text = "34567@@sd.k my-OP.email@winner.k pp45@fgjg.kk";
//$blacklist = array("*.k");

$emailpattern = "/[a-zA-Z0-9+_-]+@[a-zA-Z0-9+_-]+\.[a-zA-Z0-9-.]+/";
$pattern = array();
foreach ($blacklist as $item) {
    if (strpos($item, '*') !== false) {
        $endsWithPattern = "/[a-zA-Z0-9+_-]+@[a-zA-Z0-9+_-]+\\";
        $item = str_replace("*", "", $item);
        $pattern[] = $endsWithPattern . $item . '/';
    } else {
        $pattern[] = '/' . $item . '/';
    }
}
for ($i = 0; $i < sizeof($pattern); $i++) {
    if (preg_match($pattern[$i], $text, $matches)) {
        $text = preg_replace($pattern[$i], createAsterisks(strlen($matches[0])), $text) . "\n";
    }
}
preg_match_all($emailpattern, $text, $matches);
foreach($matches[0] as $currMatch) {
   $text = preg_replace('/'.$currMatch.'/', '<a href="mailto:'. $currMatch .'">'. $currMatch . '</a>', $text);
}
$text = trim($text);
echo '<p>'.$text.'</p>';
function createAsterisks($n)
{
    $asterisks = '';
    for ($i = 0; $i<$n; $i++) {
        $asterisks.= '*';
    }
    return $asterisks;
}