Untitled

<?php
/**
 * Created by PhpStorm.
 * User: luckymancvp
 * Date: 3/7/17
 * Time: 11:38 PM
 */

$mailInput = isset($_POST['mailInput']) ? $_POST['mailInput'] : '';
$mails = array_unique(explode(PHP_EOL, trim($mailInput)));
$type = isset($_POST['type']) ? $_POST['type'] : '';
$res = array();
if ($type)
{
    $mailInput = "";
    foreach ($mails as $mail) {
        if (strpos($mail, $type) !== false)
            $res[] = $mail;
        else
            $mailInput .= $mail . PHP_EOL;
    }
}

$res = implode(PHP_EOL, $res);

?>

<html>
<body>
<form method="post">
    <select name="type">
        <option value="@gmail.com">@gmail.com</option>
        <option value="comcast">comcast</option>
        <option value="sbcglobal">sbcglobal</option>
        <option value="@mail.com">@mail.com</option>
		<option value="@att">@att</option>
    </select>
    <br>
    <textarea name="mailInput" placeholder="Input" cols="50" rows="20"><?php echo $mailInput?></textarea>
    <br>
    <textarea name="res" placeholder="output" cols="50" rows="20"><?php echo $res?></textarea>
    <br>
    <input type="submit"/>
</form>
</body>
</html>