@Süleyman hocam teşekkür ederim.

Resmi boyutlandıran uygulamayı şu şekilde ekliyorum.Ancak denedim ben beceremedim.

BOYUTLANDIR.PHP

<?php
 //--------------------------------
 //     UFAK RESIM FONKSIYONLARI
 //--------------------------------

 define( 'THUMBNAIL_IMAGE_MAX_WIDTH', 150 );
 define( 'THUMBNAIL_IMAGE_MAX_HEIGHT', 150 );

 function generate_image_thumbnail( $source_image_path, $thumbnail_image_path )
 {
  list( $source_image_width, $source_image_height, $source_image_type ) = getimagesize( $source_image_path );

  switch ( $source_image_type )
  {
   case IMAGETYPE_GIF:
    $source_gd_image = imagecreatefromgif( $source_image_path );
    break;

   case IMAGETYPE_JPEG:
    $source_gd_image = imagecreatefromjpeg( $source_image_path );
    break;

   case IMAGETYPE_PNG:
    $source_gd_image = imagecreatefrompng( $source_image_path );
    break;
  }

  if ( $source_gd_image === false )
  {
   return false;
  }

  $thumbnail_image_width = THUMBNAIL_IMAGE_MAX_WIDTH;
  $thumbnail_image_height = THUMBNAIL_IMAGE_MAX_HEIGHT;

  $source_aspect_ratio = $source_image_width / $source_image_height;
  $thumbnail_aspect_ratio = $thumbnail_image_width / $thumbnail_image_height;

  if ( $source_image_width <= $thumbnail_image_width && $source_image_height <= $thumbnail_image_height )
  {
   $thumbnail_image_width = $source_image_width;
   $thumbnail_image_height = $source_image_height;
  }
  elseif ( $thumbnail_aspect_ratio > $source_aspect_ratio )
  {
   $thumbnail_image_width = ( int ) ( $thumbnail_image_height * $source_aspect_ratio );
  }
  else
  {
   $thumbnail_image_height = ( int ) ( $thumbnail_image_width / $source_aspect_ratio );
  }

  $thumbnail_gd_image = imagecreatetruecolor( $thumbnail_image_width, $thumbnail_image_height );

  imagecopyresampled( $thumbnail_gd_image, $source_gd_image, 0, 0, 0, 0, $thumbnail_image_width, $thumbnail_image_height, $source_image_width, $source_image_height );

  imagejpeg( $thumbnail_gd_image, $thumbnail_image_path, 90 );

  imagedestroy( $source_gd_image );

  imagedestroy( $thumbnail_gd_image );

  return true;
 }

 //--------------------------------
 // DOSYA HAZIRLAMA FONKSIYONLARI VE YUKLEME
 //--------------------------------

 define( 'UPLOADED_IMAGE_DESTINATION', './resimler/yuklenenler/' );
 define( 'THUMBNAIL_IMAGE_DESTINATION', './resimler/ufakresim/' );

 function process_image_upload( $field )
 {
  $temp_image_path = $_FILES[ $field ][ 'tmp_name' ];
  $temp_image_name = $_FILES[ $field ][ 'name' ];

  list( , , $temp_image_type ) = getimagesize( $temp_image_path );

  if ( $temp_image_type === NULL )
  {
   return false;
  }

  switch ( $temp_image_type )
  {
   case IMAGETYPE_GIF:
    break;

   case IMAGETYPE_JPEG:
    break;

   case IMAGETYPE_PNG:
    break;

   default:
    return false;
  }

  $uploaded_image_path = UPLOADED_IMAGE_DESTINATION . $temp_image_name;

  move_uploaded_file( $temp_image_path, $uploaded_image_path );

  $thumbnail_image_path = THUMBNAIL_IMAGE_DESTINATION . preg_replace( '{\\.[^\\.]+$}', '.jpg', $temp_image_name );

  $result = generate_image_thumbnail( $uploaded_image_path, $thumbnail_image_path );

  return $result
   ? array( $uploaded_image_path, $thumbnail_image_path )
   : false;
 }

 //--------------------------------
 // SAYFA YAZDIRILIYOR 
 //--------------------------------

 $result = process_image_upload( 'Image1' );

 if ( $result === false )
 {
  echo '<br>Hata Lutfen Yeniden Deneyiniz';
 }
 else
 {

 }
?>



Resminiz Yüklendi : <a target="_blank" href="http://site.com/yuklemeler/<?php echo $result[0];?>">Resim Büyük hali Önizlemesi</a>
<br><br>
Kucuk resim basari ile olusturuldu : <a target="_blank" href="http://site.com/yuklemeler/<?php echo $result[1];?>">Küçük Resim Önizlemesi</a>

RESIMEKLE.PHP

<form action="boyutlandir.php" method="post" enctype="multipart/form-data">
  Resim Seçiniz<br>
  <input type="file" name="Image1"><br>
  <input type="submit" value="Yükle">
</form>

Not : Resim boyutlandırma sayfasını include ile manşet sisteminin yönetim arayüzünde çalıştırıyorum.