Membuat IF NOT .JPG pada PHP

 $lokasi_file    = $_FILES['fupload']['tmp_name'];
  $tipe_file      = $_FILES['fupload']['type'];
  $nama_file      = $_FILES['fupload']['name'];
  $acak           = rand(1,99);
  $nama_file_unik = $acak.$nama_file;
 
  if (!empty($_POST['tag_seo'])){
    $tag_seo = $_POST['tag_seo'];
    $tag=implode(',',$tag_seo);
  }
  $judul_seo      = seo_title($_POST['judul']);

  // Apabila ada gambar yang diupload
  if (!empty($lokasi_file)){
    if ($tipe_file != "image/jpeg" AND $tipe_file != "image/pjpeg"){
    echo "<script>window.alert('Upload Gagal, Pastikan File yang di Upload bertipe *.JPG');
        window.location=('../../media.php?module=berita)</script>";
    }
    else{
    UploadImage($nama_file_unik);
    }
?>   
<?php
// Upload gambar untuk berita
function UploadImage($fupload_name){
  //direktori gambar
  $vdir_upload = "../../../foto_berita/";
  $vfile_upload = $vdir_upload . $fupload_name;

  //Simpan gambar dalam ukuran sebenarnya
  move_uploaded_file($_FILES["fupload"]["tmp_name"], $vfile_upload);

  //identitas file asli
  $im_src = imagecreatefromjpeg($vfile_upload);
  $src_width = imageSX($im_src);
  $src_height = imageSY($im_src);

  //Simpan dalam versi small 110 pixel
  //Set ukuran gambar hasil perubahan
  $dst_width = 110;
  $dst_height = ($dst_width/$src_width)*$src_height;

  //proses perubahan ukuran
  $im = imagecreatetruecolor($dst_width,$dst_height);
  imagecopyresampled($im, $im_src, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);

  //Simpan gambar
  imagejpeg($im,$vdir_upload . "small_" . $fupload_name);
 

  //Simpan dalam versi medium 360 pixel
  //Set ukuran gambar hasil perubahan
  $dst_width2 = 390;
  $dst_height2 = ($dst_width2/$src_width)*$src_height;

  //proses perubahan ukuran
  $im2 = imagecreatetruecolor($dst_width2,$dst_height2);
  imagecopyresampled($im2, $im_src, 0, 0, 0, 0, $dst_width2, $dst_height2, $src_width, $src_height);

  //Simpan gambar
  imagejpeg($im2,$vdir_upload . "medium_" . $fupload_name);
 
  //Hapus gambar di memori komputer
  imagedestroy($im_src);
  imagedestroy($im);
  imagedestroy($im2);
}