FaceBook UserName & Email Extractor

<?php
ob_start();
@set_time_limit(0);
 error_reporting(0);
echo "
<head>
<link href='https://fonts.googleapis.com/css?family=Orbitron' rel='stylesheet' type='text/css'>
<form method='POST'>
</head>
<style>
textarea {
     margin-left: 0px; margin-right: 0px; width: 823px;
        color: #1975FF ;
        border:4px solid red ;
        font-family: 'Orbitron', sans-serif;
        font-size:15px;
}
html,body{
       font-family: 'Orbitron', sans-serif;
       background:#000000;
}

input {
       color: 3300FF;
       border:4px solid #33CCFF;
       font-family: 'Orbitron', sans-serif;
}
h1{
        color: #FFFFFF;
       font-family: 'Orbitron', sans-serif;
        }
h3,fieldset {
       color: #FFFFFF;
       width:50%;
       border:4px solid red;
       font-family: 'Orbitron', sans-serif;

}
</style>";

echo "
<center><h1>FaceB00k UserName & Email Extractor - H4T3D</h1></center>
<center><h3>EnTer Facebook Profile Url </h3></center>
<p dir='ltr' align='center'>
<textarea cols='22' class='area'  rows='14' name='username'>https://www.facebook.com/profile.php?id=100005207325887\nhttps://www.facebook.com/profile.php?id=100005408441434\nhttps://www.facebook.com/profile.php?id=100005686629223\nhttps://www.facebook.com/profile.php?id=100007705632626\r\nhttps://www.facebook.com/profile.php?id=100006794283657\r\nhttps://www.facebook.com/profile.php?id=100002416635195\r\nhttps://www.facebook.com/gaf.richards.3\r\nhttps://www.facebook.com/sutthiphong.koolsing</textarea>
<br>
<br>
<input type='submit' name='scan' value='Start'><br>
<center><h3> >> <a href=\"validfbemails.txt\">Valid Emails</a></h3></center>
</p>";

if(isset($_POST['scan'])){
$username = explode("\n", $_POST['username']);

echo"<center>
<textarea rows=\"14\">";
foreach($username as $users) {
        $users = @trim($users);

    $users = trim($users,"https://www.facebook.com/profile.php?id=");
    $users = trim($users,"http://www.facebook.com/profile.php?id=");
    $users = trim($users,"http://www.m.facebook.com/profile.php?id=");
    $users = trim($users,"https://www.m.facebook.com/profile.php?id=");
    $users = trim($users,"https://www.facebook.com/");
    $users = trim($users,"https://www.m.facebook.com/");
    $users = trim($users,"http://www.m.facebook.com/");


                echo $users."@facebook.com\n";
                             }

}
echo"
</textarea>
</center>";

echo"<center><h3> Coded By H4T3D</h3></center>";
?>