php - Exchanging name fo random number -


i have code below part of script saves images onto wordpress installation. problem script saves image original name, example "originalimage.jpg". want saved image get's random number assigned like, "randomnumber.jpg" , wonder how can can take taken random number again if used 1 once. tried far breaks code. can please help?

function wpr_save_all_images($content,$keyword,$insert) {     $path = wp_upload_dir();     $path = $path['baseurl'];     $html = $content;     if ( stripos( $html, '<img' ) !== false ) {          $regex = '#<\s*img [^\>]*src\s*=\s*(["\'])(.*?)\1#im';         preg_match_all( $regex, $html, $matches );          if ( is_array( $matches ) && ! empty( $matches ) ) {             $new = array();             $old = array();              require_once(abspath . 'wp-admin/includes/file.php');             require_once(abspath . 'wp-admin/includes/media.php');             require_once(abspath . 'wp-admin/includes/image.php');              foreach( $matches[2] $img ) {                  if (  stripos( $img, "images/buynow-big.gif" ) !== false ) {                     continue;                 }                         $size = getimagesize($img);                 $width = $size[0];                 $height = $size[1];                 if (  $width < 2 || $height < 2 ) {                     continue;                 }                                 if (  stripos( $img, $path ) !== false ) {                     continue;                 }                  $tmp = download_url( $img );                  preg_match('/[^\?]+\.(jpg|jpg|jpe|jpe|jpeg|jpeg|gif|gif|png|png)/', $img, $matches);                  $newfn = str_replace(array("%2b", "%52", "%20", "%5"), "b", basename($matches[0]));                  $oofnm = basename($matches[0]);                  if($newfn != $oofnm) {                                    $newfn2 = str_replace(array(".jpg", ".png", ".gif"), "", $newfn);                      $tmppath = pathinfo( $tmp );                                                        // extract path parts                     $newpth = $tmppath['dirname'] . "/". $newfn2 . "." . $tmppath['extension'];                         rename($tmp, $newpth);                                                                 // renames temp file on server                     $tmp = $newpth;                                  }                  $file_array['name'] = $newfn;                 $file_array['tmp_name'] = $tmp;                  // if error storing temporarily, unlink                 if ( is_wp_error( $tmp ) ) {                     @unlink($file_array['tmp_name']);                     $file_array['tmp_name'] = '';                     continue;                 }                  $id = media_handle_sideload( $file_array, $insert );                  if ( ! is_wp_error( $id ) ) {                     $url  = wp_get_attachment_url( $id );                     $thumb = wp_get_attachment_thumb_url( $id );                     array_push( $new, $url );                     array_push( $old, $img );                 }                  //echo "old: ". $img . "<br>wawa: " . $wawawa . "<br>new: " . $url . " <br>";                                                                    }              if( !empty( $new ) ) {                 $content = str_ireplace( $old, $new, $html );                 $post_args = array( 'id' => $insert, 'post_content' => $content, );                 if (!empty($content))                     $post_id = wp_update_post( $post_args );             }         }     }      return true; }


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