AJAX - Upload php mysql (mp3 y buscador)

<?php

include('config.php');

// extenciones permitidas para subir

$allowedExts = array("mp3","MP3");

$temp = explode(".", $_FILES["file"]["name"]);

$extension = end($temp);

//checar si la extencion es valida

// subir al folder

//echo '0' si ay error

if ((($_FILES["file"]["type"] == "audio/mp3")

|| ($_FILES["file"]["type"] == "audio/MP3"))

&& in_array($extension, $allowedExts)) {

if ($_FILES["file"]["error"] > 0) {

echo "0";

} else {

$fileName = $_FILES["file"]["name"];

$fileType = $_FILES["file"]["type"];

$fileSize = $_FILES["file"]["size"];

$urlid = rand(10000,90000);

$urlid2 = rand(10000000000000000,900000000000000000);

$target = "upload/";

move_uploaded_file($_FILES["file"]["tmp_name"], $target. $urlid2. ".mp3" );

$url = "$urlid2.mp3";

mysql_query("INSERT INTO archivos VALUE ('$urlid', '$fileName', '$url', '$fileType', '$fileSize')");

echo $fileName ."<br> <a href='file?id=$urlid'>Ir al archivo</a> <br />";

}

} else {

echo "0";

}

echo $_FILES["file"]["type"];