如何更改存储文件的名称

Question

I am using image upload and resize script from someones blog. It stores the name of file as resize.jpg .however i want to give unique names to them as data will go in database...I am very bad in using functions so please guide me.

 <?php
    class SimpleImage {

     var $image;
     var $image_type;

     function load($filename) {

      $image_info = getimagesize($filename);
      $this->image_type = $image_info[2];
      if( $this->image_type == IMAGETYPE_JPEG ) {

         $this->image = imagecreatefromjpeg($filename);
      } elseif( $this->image_type == IMAGETYPE_GIF ) {

         $this->image = imagecreatefromgif($filename);
      } elseif( $this->image_type == IMAGETYPE_PNG ) {

         $this->image = imagecreatefrompng($filename);
      }
   }
            function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75,     $permissions=null) {

      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image,$filename,$compression);
      } elseif( $image_type == IMAGETYPE_GIF ) {

         imagegif($this->image,$filename);
      } elseif( $image_type == IMAGETYPE_PNG ) {

         imagepng($this->image,$filename);
      }
      if( $permissions != null) {

         chmod($filename,$permissions);
      }
   }
   function output($image_type=IMAGETYPE_JPEG) {

      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image);
      } elseif( $image_type == IMAGETYPE_GIF ) {

         imagegif($this->image);
      } elseif( $image_type == IMAGETYPE_PNG ) {

         imagepng($this->image);
      }
    }
       function getWidth() {

      return imagesx($this->image);
      }
      function getHeight() {

      return imagesy($this->image);
      }
       function resizeToHeight($height) {

      $ratio = $height / $this->getHeight();
      $width = $this->getWidth() * $ratio;
      $this->resize($width,$height);
   }

   function resizeToWidth($width) {
      $ratio = $width / $this->getWidth();
      $height = $this->getheight() * $ratio;
      $this->resize($width,$height);
   }

   function scale($scale) {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
   }

   function resize($width,$height) {
      $new_image = imagecreatetruecolor($width, $height);
      imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
      $this->image = $new_image;
   }      

}
?>  
<?php
   if( isset($_POST['submit']) ) {
      include('SimpleImage.php');
      $image = new SimpleImage();
      $image->load($_FILES['uploaded_image']['tmp_name']);
      $image->resizeToWidth(300);
      $image->resizeToHeight(200);
      $image->save('images/resize.jpg');
      //$image->output();
   } else {
?>   <form action="" method="post" enctype="multipart/form-data">
      <input type="file" name="uploaded_image" />
      <input type="submit" name="submit" value="Upload" />
   </form><?php
   }
?>

Answer 1

Inside this block, you are saving every one as resize.jpg

  $image->resizeToWidth(300);
  $image->resizeToHeight(200);
  $image->save('images/resize.jpg');

You can generate a unique name with uniqid() and optionally add a prefix onto it like img_. Your filenames will then look like:

'img_4e297753130db.jpg'

Start by generating a filename, saved in a variable.

$prefix = "img_"
$new_filename = uniqid($prefix) . ".jpg";

// Do your other processing
// ...
$image->resizeToWidth(300);
$image->resizeToHeight(200);

// Save with the new filename
// Note change to double quotes from single...
$image->save("images/$new_filename");

Later, when you're ready to store the filename in the database, it's still available in $new_filename