Snippets Graphics
Graphics
ImageThumb
by: Marco Olivo
|
February 6, 2005
Version: 1.0
Type: Full Script
Category: Graphics
License: GNU General Public License
Description: ImageThumb is a small piece of software written in the PHP language that lets you create thumbnails on the fly for a given image, whether it is local ore remote. Currently supported formats are GIF, PNG and JPEG. To use this script, you must have the GD library installed, and obiously a webserver capable of running PHP scripts.
<?php /* $Id$ */
# ImageThumb - a simple on-the-fly image thumbnailer in PHP.
# Copyright (C) 2003, 2004, 2005 Marco Olivo
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
/***********************************************************************/
/* ImageThumb, v.1.0 */
/* - creates a thumbnail of up to the given size of the given image, */
/* keeping the original aspect ratio. */
/* Copyright (C) by Marco Olivo, 2003-2005 */
/* This sofware can be found at: */
/* http://www.olivo.net/software/imagethumb/ */
/* */
/* PARAMETERS */
/* ---------- */
/* s - the path to the image to be resized (can also be an URL) */
/* w - the max width desired (optional, default: 320) */
/* h - the max height desired (optional, default: 200) */
/* */
/* GD-library compiled and loaded in PHP is REQUIRED. */
/* */
/* This software is distributed under GPL license 2 or following. */
/* */
/***********************************************************************/
/* some settings */
ignore_user_abort();
set_time_limit( 0 );
error_reporting( FATAL | ERROR | WARNING );
/* security check */
ini_set( 'register_globals', '0' );
/* start buffered output */
ob_start();
/* temporary kludge */
//while ( list( $key, $val ) = each( $HTTP_GET_VARS ) ) $_GET[ $key ] = $val;
/* some checks */
if ( ! isset( $_GET['s'] ) ) die( 'Source image not specified' );
if ( isset( $_GET['w'] ) && ereg( "^[0-9]+$", $_GET['w'] ) ) $MAX_WIDTH = $_GET['w'];
else $MAX_WIDTH = 320;
if ( isset( $_GET['h'] ) && ereg( "^[0-9]+$", $_GET['h'] ) ) $MAX_HEIGHT = $_GET['h'];
else $MAX_HEIGHT = 200;
/* get source image size */
$src_size = getimagesize( $_GET['s'] );
/* resize the image (if needed) */
if ( $src_size[0] > $MAX_WIDTH && $src_size[1] > $MAX_HEIGHT ) {
if ( $src_size[0] > $src_size[1] ) {
$dest_width = $MAX_WIDTH;
$dest_height = ( $src_size[1] * $MAX_WIDTH ) / $src_size[0];
}
else {
$dest_width = ( $src_size[0] * $MAX_HEIGHT ) / $src_size[1];
$dest_height = $MAX_HEIGHT;
}
}
else if ( $src_size[0] > $MAX_WIDTH ) {
$dest_width = $MAX_WIDTH;
$dest_height = ( $src_size[1] * $MAX_WIDTH ) / $src_size[0];
}
else if ( $src_size[1] > $MAX_HEIGHT ) {
$dest_width = ( $src_size[0] * $MAX_HEIGHT ) / $src_size[1];
$dest_height = $MAX_HEIGHT;
}
else {
$dest_width = $src_size[0];
$dest_height = $src_size[1];
}
if ( extension_loaded( 'gd' ) ) {
/* check the source file format */
$ext = substr( $_GET['s'], strrpos( $_GET['s'], '.' ) + 1 );
if ( $ext == 'jpg' || $ext == 'jpeg' ) $src = imagecreatefromjpeg( $_GET['s'] ) or die( 'Cannot load input JPEG image' );
else if ( $ext == 'gif' ) $src = imagecreatefromgif( $_GET['s'] ) or die( 'Cannot load input GIF image' );
else if ( $ext == 'png' ) $src = imagecreatefrompng( $_GET['s'] ) or die( 'Cannot load input PNG image' );
else die( 'Unsupported source file format' );
/* create and output the destination image */
$dest = imagecreate( $dest_width, $dest_height ) or die( 'Cannot initialize new GD image stream' );
imagecopyresized( $dest, $src, 0, 0, 0, 0, $dest_width, $dest_height, $src_size[0], $src_size[1] );
if ( imagetypes() & IMG_PNG ) {
header ( 'Content-type: image/png' );
imagepng( $dest );
}
else if ( imagetypes() & IMG_JPG ) {
header ( 'Content-type: image/jpeg' );
imagejpeg( $dest );
}
else if ( imagetypes() & IMG_GIF ) {
header ( 'Content-type: image/gif' );
imagegif( $dest );
}
else print 'Cannot find a suitable output format';
}
else print 'GD-library support is not available';
/* end buffered output */
ob_end_flush();
?>
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