[thelist] PHP GD library
Brian Cummiskey
Brian at hondaswap.com
Tue Dec 9 01:23:57 CST 2003
upgrade to GD 2.0. you really need it
here's a couple functions i use for a thumb generator for jpg only.
// form //
<form action="handeler.php" encType="multipart/form-data" method="post"
name="sendform">
<input name="MAX_FILE_SIZE" type="hidden" value="1000000">
<input name="image" type="file" accept="image/jpeg, image/jpg">
<input type="submit">
// handler //
#############################################################################################
$IMG_ORG_HEIGHT = "*"; #Width of original image stored on server
$IMG_ORG_WIDTH = "*"; #Height of original image stored on server
#set to "*" to prevent resizing on the dimension
#you will not lost X to Y ratio
$IMG_HEIGHT = "60"; # Accepted height of resized image
$IMG_WIDTH = "80"; # Accepted width of resized image
# read about "*" above
$IMG_ROOT = "./images"; # Relative path to folder where uploaded
images will be stored; no ending slash!
# Like this: $IMG_ROOT = "./img";
# Remeber to set proper attributes to that folder. 777 will
work :)
$use_imagecreatetruecolor = true; // these flags enble
ImageCreateTrueColor(); ImageCopyResampled();
$use_imagecopyresampled = true;
$JPG_QUALITY = 80; // output jpeg quality
#############################################################################################
if(!$HTTP_POST_FILES ["image"]["tmp_name"] || $HTTP_POST_FILES
["image"]["tmp_name"] =="none") die("Your images may be no larger than
100KB in size. Please make it smaller, and try again.");
if( ! $f_org =
resizer_main("image","",$IMG_ORG_WIDTH,$IMG_ORG_HEIGHT))die("<br><font
color=\"red\"><b>No Image received...</b></font><br>");
if( ! $f_res =
resizer_main("image","res_",$IMG_WIDTH,$IMG_HEIGHT))die("<br><font
color=\"red\"><b>Not resized :( </b></font><br>");
$sz_org =getimagesize( "$IMG_ROOT/$f_org" );
$sz_res =getimagesize( "$IMG_ROOT/$f_res" );
$fs_org= filesize("$IMG_ROOT/$f_org" );
$fs_res= filesize("$IMG_ROOT/$f_res" );
$html =<<< EHTML
// put what you want to echo out after upload here.... may include your
template....
// ie:
<b>Resized image:</b> <img src="$IMG_ROOT/$f_res" $sz_res[3]>
<b>Original image:</b> <img src="$IMG_ROOT/$f_org" $sz_org[3]>
EHTML;
echo $html;
// and now, the functions.... probably include these remotely
#############################################################################################
function resizer_main($image, $dest_file_prefix,$w, $h){
//image_name = uploaded image. Name or your file field in your form.
//w,h - width and height to fit image in
global $use_imagecreatetruecolor, $use_imagecopyresampled, $IMG_ROOT,
$JPG_QUALITY, $HTTP_POST_FILES;
$image_name = $HTTP_POST_FILES [$image]["name"];
$image = $HTTP_POST_FILES [$image]["tmp_name"];
if(trim($image) == "" || trim($image) =="none") return false;
$arr_img = image_from_upload($image);
if( $arr_img["w"] != $w && $arr_img["h"] != $h){
$wh = get_sizes($arr_img["w"], $arr_img["h"], $w, $h);
$img_res = img_get_resized(
$arr_img["img"],
$arr_img["w"], $arr_img["h"],
$wh["w"], $wh["h"],
$use_imagecreatetruecolor,
$use_imagecopyresampled);
} else {
//wow it is exactly like needed!!!
$img_res = $arr_img["img"];
}
$file_name = make_filename($image_name, $dest_file_prefix);
ImageJPEG($img_res,"$IMG_ROOT/$dest_file_prefix$file_name",
$JPG_QUALITY);
return "$dest_file_prefix$file_name";
}
function image_from_upload($uploaded_file){
$img_sz = getimagesize( $uploaded_file ); ## returns array with
some properties like dimensions and type;
####### Now create original image from uploaded file. Be carefull!
GIF is often not supported, as far as I remember from GD 1.6-2.0
switch( $img_sz[2] ){
case 1:
$img_type = "GIF";
//$img = ImageCreateFromGif($uploaded_file);
die("<br><font color=\"red\"><b>Sorry, Only JPG's are
supported.</b></font><br>");
break;
case 2:
$img = ImageCreateFromJpeg($uploaded_file);
$img_type = "JPG";
break;
case 3:
$img = ImageCreateFromPng($uploaded_file);
$img_type = "PNG";
break;
case 4:
$img_type = "SWF";
//$img = ImageCreateFromSwf($uploaded_file);
die("<br><font color=\"red\"><b>Sorry, Only JPG's are
supported.</b></font><br>");
break;
default: die("<br><font color=\"red\"><b>Sorry, Only JPG's are
supported.</b></font><br>");
}//case
return array("img"=>$img, "w"=>$img_sz[0], "h"=>$img_sz[1],
"type"=>$img_sz[2], "html"=>$img_sz[3]);
}
function get_sizes($src_w, $src_h, $dst_w,$dst_h ){
//src_w ,src_h-- start width and height
//dst_w ,dst_h-- end width and height
//return array w=>new width h=>new height mlt => multiplier
//the function tries to shrink or enalrge src_w,h in such a way to
best fit them into dst_w,h
//keeping x to y ratio unchanged
//dst_w or/and dst_h can be "*" in this means that we dont care
about that dimension
//for example if dst_w="*" then we will try to resize by height not
caring about width
//(but resizing width in such a way to keep the xy ratio)
//if both = "*" we dont resize at all.
#### Calculate multipliers
$mlt_w = $dst_w / $src_w;
$mlt_h = $dst_h / $src_h;
$mlt = $mlt_w < $mlt_h ? $mlt_w:$mlt_h;
if($dst_w == "*") $mlt = $mlt_h;
if($dst_h == "*") $mlt = $mlt_w;
if($dst_w == "*" && $dst_h == "*") $mlt=1;
#### Calculate new dimensions
$img_new_w = round($src_w * $mlt);
$img_new_h = round($src_h * $mlt);
return array("w" => $img_new_w, "h" => $img_new_h, "mlt_w"=>$mlt_w,
"mlt_h"=>$mlt_h, "mlt"=>$mlt);
}
function
img_get_resized($img_original,$img_w,$img_h,$img_new_w,$img_new_h,$use_imagecreatetruecolor=false,
$use_imagecopyresampled=false){
//$img_original, -- image to be resized
//$img_w, -- its width
//$img_h, -- its height
//$img_new_w, -- resized width
//$img_new_h -- height
//$use_imagecreatetruecolor, $use_imagecopyresampled allow use of
these function
//if they exist on the server
if( $use_imagecreatetruecolor &&
function_exists("imagecreatetruecolor")){
// echo("Using ImageCreateTruecolor (better quality)<br>");
$img_resized = imagecreatetruecolor($img_new_w,$img_new_h) or
die("<br><font color=\"red\"><b>Failed to create destination
image.</b></font><br>");
} else {
// echo("Using ImageCreate (usual quality)<br>");
$img_resized = imagecreate($img_new_w,$img_new_h) or
die("<br><font color=\"red\"><b>Failed to create destination
image.</b></font><br>");
}
if($use_imagecopyresampled && function_exists("imagecopyresampled")){
// echo("Using ImageCopyResampled (better quality)<br>");
imagecopyresampled($img_resized, $img_original, 0, 0, 0,
0,$img_new_w, $img_new_h, $img_w,$img_h) or die("<br><font
color=\"red\"><b>Failed to resize @ ImageCopyResampled()</b></font><br>");
}else{
// echo("Using ImageCopyResized (usual quality)<br>");
imagecopyresized($img_resized, $img_original, 0, 0, 0,
0,$img_new_w, $img_new_h, $img_w,$img_h) or die("<br><font
color=\"red\"><b>Failed to resize @ ImageCopyResized()</b></font><br>");
}
return $img_resized;
}
function make_filename($image_name){
## creates unique name, here I assume that it will never happen that
in same second
## two files with same name on user's site will be uploaded. However
you can use your
## ways to generate unique name. Function unqueid() for example.
//$file_name = time()."_$image_name";
$file_name = uniqid('s').'.jpg';
#kick the original extension
$pos = strrpos($file_name, '.');
//gif sin't supported, so hardcode jpg extention
$file_name = substr($file_name, 0,$pos).".jpg";
return $file_name;
}
More information about the thelist
mailing list