PHP Remote Download

<html>
<head>
<title>Remote Download</title>
<script type="text/javascript">
var i=12;
var y=0;
function AddMore(){
    if (i<31){
        var output = document.getElementById('content');
        var ele = document.createElement("div");
        ele.setAttribute("id","multidiv_" + i);
        ele.innerHTML="URL: <input type=\"text\" id=\"multiid_url_" + i + "\" name=\"multi_" + i + "_URL\"> Save As: <input type=\"text\" id=\"multiid_" + i + "\" name=\"multi_file_" + i + "_filename\"><button type=\"button\" onclick=\"GrabFileName(\'multiid_" + i + "\');\">Strip Filename From URL</button>";
        output.appendChild(ele);
        i++;
    }
    if (i>30){
        if (y==0){
        var output = document.getElementById('content');
        var ele = document.createElement("div");
        ele.setAttribute("id","multidiv_error" + i);
        ele.innerHTML="<h2>There\'s a limit of 30 downloads per request!</h2>";
        output.appendChild(ele);
        y=1;
        }
    }
}
function GrabFileName($x){
    var elem = document.getElementById($x);
    var str = $x;
    var doom = str.replace("multiid_","multiid_url_");
    var file = document.getElementById(doom).value;
    var strip = file.replace(/^.*[\\\/]/, '');
    elem.value = strip;
}
</script>
</head>
<body>
<?php
function Yell($input){
    return '<p>' . $input . '</p>';
}
?>
<?php


if(isset($_POST['submit_multi'])) {
$foldername = $_REQUEST['multi_0_folder'];


if (file_exists($foldername)) {
} else {
    if(!empty($foldername) == TRUE){
        if (!mkdir($foldername, 0777, true)) {
            echo yell('Something went wrong when creating the folder, trying to continue..');
        } else {
            echo yell('Created folder: <a target="_blank" href="' . $foldername . '">' .  $foldername . '</a>, now storing files..');
        }
    }
}

$i = 1;
while ($i <= 30){

if(!empty($_REQUEST['multi_' . $i . '_URL']) == TRUE){
    if(!empty($_REQUEST['multi_file_' . $i . '_filename']) == TRUE){
    $data_1 = file_get_contents($_REQUEST['multi_' . $i . '_URL']);
    file_put_contents($foldername . '/' . $_REQUEST['multi_file_' . $i . '_filename'], $data_1);
    $pathtoimage = str_replace('/', '', $foldername) . '/' . $_REQUEST['multi_file_' . $i . '_filename'];
    echo Yell('Storing .. <a target="_blank" href="' . $pathtoimage . '">' . $_REQUEST['multi_file_' . $i . '_filename'] . '</a> .. OK!');
    }
}

    $i++;
}

}


if(isset($_REQUEST['submit_url'])) {
$url = $_REQUEST['submit_url'];
$data = file_get_contents($url);
$path = pathinfo($url);

if(isset($path['extension'])){
$extension = '.' . $path['extension'];
$def = FALSE;
} else {
$extension = '.jpg';
$def = TRUE;
}
$time_today = date('d-m-y_G-i-s', time());
$fullname = 'temp_ignore/' . $time_today . $extension;
file_put_contents($fullname, $data);
echo '<p>Success!</p>';
if($def == TRUE){
    echo Yell('File extension could not be extracted from the path, file has been set to .jpg (default)');
}
echo Yell('File downloaded and stored in <a href="temp_ignore">temp_ignore</a> as <a href="temp_ignore/' . $time_today . $extension . '">' . $time_today . $extension . '</a>');
echo Yell('Download it using FTP for the raw file</p>');
}
?>
<?php
$isset = FALSE;
$mode = 0;
if(isset($_GET['mode'])) {
$mode = $_GET['mode'];
} else {
$mode = 0;
}

if($mode == 0){
$isset = TRUE;
echo '<form action="" method="POST" name="submit_download"><input type="text" name="submit_url"></input><input type="submit" value="OK"></input></form>';
}
if($mode == 1){
$isset = TRUE;
echo '<button type="button" onclick="AddMore();">Add Row +</button>';
echo '<form action="" method="POST" name="multi_download" id="form_content"><div id="content">
<div id="multidiv_0">New folder name: <input type="text" name="multi_0_folder"></div>
<p>Include extensions on Save As part!</p>';

$i = 1;
while ($i <= 11){
echo '<div id="multidiv_' . $i . '">URL: <input type="text" id="multiid_url_' . $i . '" name="multi_' . $i . '_URL"> Save As: <input type="text" id="multiid_' . $i . '" name="multi_file_' . $i . '_filename"><button type="button" onclick="GrabFileName(\'multiid_' . $i . '\');">Strip Filename From URL</button></div>';
    $i++;
}

echo '</div><p>This may take some time depending on the file sizes!</p>
<p></input><input type="submit" name="submit_multi" value="Store Files"></p></input>
<p>';
}

if($isset == FALSE){
echo '<form action="" method="POST" name="submit_download"><input type="text" name="submit_url"></input><input type="submit" value="OK"></input></form>';
}
?>
<p>Use the mode call for different options, <a href="?mode=0">0</a> = default, <a href="?mode=1">1</a> = multiple downloads</p>
</form>
</body>
</html>