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Simple Image Resize in GD
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Tue. Mar. 6th, 2007 2:36 PM
This is a simple function that resizes and image using the GD add on for PHP.
Just a disclaimer: I know its not perfect, but i figured i would post it because the only other one on here is way confusing to some new PHP developers. Hopefully this one will help you learn how to use GD, and then you can write a better one.
Just a disclaimer: I know its not perfect, but i figured i would post it because the only other one on here is way confusing to some new PHP developers. Hopefully this one will help you learn how to use GD, and then you can write a better one.
function resizeImage($file,$scale="",$width="",$height="")
{
// If they wish to scale the image.
if (isset($scale))
{
// Create our image object from the image.
$fullImage = imagecreatefromjpeg($file);
// Get the image size, used in calculations later.
$fullSize = getimagesize($file);
// If there is NOT a thumbnail for this image, make one.
if (!file_exists("tn_".$file))
{
// Create our thumbnail size, so we can resize to this, and save it.
$tnImage = imagecreatetruecolor($fullSize[0]/$scale, $fullSize[1]/$scale);
// Resize the image.
imagecopyresampled($tnImage,$fullImage,0,0,0,0,$fullSize[0]/$scale,$fullSize[1]/$scale,$fullSize[0],$fullSize[1]);
// Create a new image thumbnail.
imagejpeg($tnImage, "tn_".$file);
// Clean Up.
imagedestroy($fullImage);
imagedestroy($tnImage);
// Return our new image.
return "tn_".$file;
}
// If there is a thumbnail file, lets just load it.
else
return "tn_".$file;
}
// If they want to force whatever size they want.
elseif (isset($width) && isset($height))
{
return "tn_".$file;
}
else
{
return false;
}
}
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*Note* Revised version is below
function resizeImage($file,$scale="",$width="",$height="")
{
//Make sure that the vars (scale, width, height) are all numeric
if((is_numeric($scale) === TRUE) ||
(is_numeric($width) === TRUE && is_numeric($height) === TRUE){
// If they wish to scale the image.
// You gotta make sure that it is set AND that it has a value.
if (isset($scale) && $scale != "")
{
// Create our image object from the image.
$fullImage = imagecreatefromjpeg($file);
// Get the image size, used in calculations later.
$fullSize = getimagesize($file);
// If there is NOT a thumbnail for this image, make one.
if (!file_exists("tn_".$file))
{
// Create our thumbnail size, so we can resize to this, and save it.
$tnImage = imagecreatetruecolor($fullSize[0]/$scale, $fullSize[1]/$scale);
// Resize the image.
imagecopyresampled($tnImage,$fullImage,0,0,0,0,$fullSize[0]/$scale,$fullSize[1]/$scale,$fullSize[0],$fullSize[1]);
// Create a new image thumbnail.
imagejpeg($tnImage, "tn_".$file);
// Clean Up.
imagedestroy($fullImage);
imagedestroy($tnImage);
// Return our new image.
return "tn_".$file;
}
// If there is a thumbnail file, lets just load it.
else
return "tn_".$file;
}
// If they want to force whatever size they want.
elseif (isset($width) && isset($height))
{
return "tn_".$file;
}
else
{
return false;
}
}else{
//Throw error:
return "Problem with the damned variables!";
}
}