Funkcija skirta sukurti sumažintą paveiksliuką (thumbnail)

Įkopijuojam funkciją į php bylą ir naudojam:

<?php
function createThumbnail($source,$destination,$new_w,$new_h) {
  // read file and create image in memory
  $src_img=imagecreatefromjpeg($source);
  // get image dimensions
  $old_x=imageSX($src_img);
  $old_y=imageSY($src_img);
  if ($old_x > $old_y) {
    $thumb_w = $new_w;
    $thumb_h = $old_y * ($new_h / $old_x);
  }
  if ($old_x < $old_y) {
    $thumb_w = $old_x * ($new_w / $old_y);
    $thumb_h = $new_h;
  }
  if ($old_x == $old_y) {
    $thumb_w = $new_w;
    $thumb_h = $new_h;
  }
  // create new destination image in memory
  $dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
  // copy resampled source image to destination
  imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y);
  // save destination image to file
  imagejpeg($dst_img, $destination, 75);
  // destroy images from memory
  imagedestroy($dst_img);
  imagedestroy($src_img);
}
?>

Naudojimas:

<?php 
  createThumbnail ("pic.jpg", "pic_thumb", 100, 100); 
?>