$maxw || $ih > $maxh){
if ($iw>$maxw && $ih<=$maxh){//too wide, height is OK
$proportion=($maxw*100)/$iw;
$neww=$maxw;
$newh=ceil(($ih*$proportion)/100);
}
else if ($iw<=$maxw && $ih>$maxh){//too high, width is OK
$proportion=($maxh*100)/$ih;
$newh=$maxh;
$neww=ceil(($iw*$proportion)/100);
}
else {//too high and too wide
if ($iw/$maxw > $ih/$maxh){//width is the bigger problem
$proportion=($maxw*100)/$iw;
$neww=$maxw;
$newh=ceil(($ih*$proportion)/100);
}
else {//height is the bigger problem
$proportion=($maxh*100)/$ih;
$newh=$maxh;
$neww=ceil(($iw*$proportion)/100);
}
}
}
else {//copy image even if not resizing
$neww=$iw;
$newh=$ih;
}
if (function_exists("imagecreatetruecolor")){//GD 2.0=good!
$newImage=imagecreatetruecolor($neww, $newh);
imagecopyresampled($newImage, $image, 0,0,0,0, $neww, $newh, $iw, $ih);
} else {//GD 1.8=only 256 colours
$newImage=imagecreate($neww, $newh);
imagecopyresized($newImage, $image, 0,0,0,0, $neww, $newh, $iw, $ih);
}
return Array($newImage, $neww, $newh);
}
if ($_POST){
$maxw = (int)$_POST['maxw'];
$maxh = (int)$_POST['maxh'];
if ($_FILES['userfile'] && $_FILES['userfile']['size']){
//handle uploaded file
$tmp = explode(".", $_FILES['userfile']['name']);
$suffix = strtolower($tmp[count($tmp)-1]);
//images only please
if (!in_array($suffix, Array("jpeg", "jpg", "gif", "png")) || !@getImageSize($_FILES['userfile']['tmp_name'])){
die("You can only upload an image file (jpeg, jpg, gif or png.) Please press back and try again");
}
$imSize = getImageSize($_FILES['userfile']['tmp_name']);
if ($imSize[0] > 1280 || $imSize[1] > 1280) die("Your source image is larger than 1280 x 1280. Sorry, this is the largest allowed to save on server load.");
//create image based on the suffix
if ($suffix=="jpeg" || $suffix=="jpg"){
$im = ImageCreateFromJPEG($_FILES['userfile']['tmp_name']);
}
else if ($suffix == "gif"){
$im = ImageCreateFromGif($_FILES['userfile']['tmp_name']);
}
else if ($suffix == "png"){
$im = imagecreatefrompng($_FILES['userfile']['tmp_name']);
}
$w = ImageSX($im);
$h = ImageSY($im);
//function resizeImage($image, $iw, $ih, $maxw, $maxh)
list($image) = resizeImage($im, $w, $h, $maxw, $maxh);
imagejpeg($image);
die();
}
}
?>
Resize an Image