PHP temporary thumbnail - php

Question

I'm not after saving an image, I just want to scale down an image by percentage and then display it on a webpage
I know I can use getimagesize to get the height width but how to scale correctly?

Answer 1

You can use a function like this .
Refer http://tutorialfeed.net/development/scale-an-image-using-php
function create_thumb( $imgSrc, $thumbnail_width, $thumbnail_height, $dest_src, $ext )
{
//getting the image dimensions
list( $width_orig, $height_orig ) = getimagesize( $imgSrc );
// Check if the images is a gif
if( $ext == 'gif' )
{
$myImage = imagecreatefromgif($imgSrc);
}
// Check if the image is a png
elseif( $ext == 'png' )
{
$myImage = imagecreatefrompng($imgSrc);
}
// Otherwise, file is jpeg
else
{
$myImage = imagecreatefromjpeg($imgSrc);
}
// Find the original ratio
$ratio_orig = $width_orig / $height_orig;
// Check whether to scale initially by height or by width
if( $thumbnail_width / $thumbnail_height > $ratio_orig )
{
$new_height = $thumbnail_width/$ratio_orig;
$new_width = $thumbnail_width;
}
else
{
$new_width = $thumbnail_height*$ratio_orig;
$new_height = $thumbnail_height;
}
$x_mid = $new_width / 2; //horizontal middle
$y_mid = $new_height / 2; //vertical middle
$process = imagecreatetruecolor( round( $new_width ), round( $new_height ) );
// Scale the image down and the reduce the other axis to create the thumbnail
imagecopyresampled($process, $myImage, 0, 0, 0, 0, $new_width, $new_height, $width_orig, $height_orig);
$thumb = imagecreatetruecolor($thumbnail_width, $thumbnail_height);
imagecopyresampled($thumb, $process, 0, 0, ($x_mid-($thumbnail_width/2)), ($y_mid-($thumbnail_height/2)), $thumbnail_width, $thumbnail_height, $thumbnail_width, $thumbnail_height);
// Depending on the file extension, save the file
if( $ext == 'gif' )
{
imagegif( $thumb, $dest_src );
}
elseif( $ext == 'png' )
{
imagepng( $thumb, $dest_src );
}
else
{
imagejpeg( $thumb, $dest_src, 100 );
}
// Remove rubbish file data
imagedestroy($process);
imagedestroy($myImage);
// Return thumb ( success / fail )
return $thumb;
}

Answer 2

You can use the resizeInPourcent() method of ImageWorkshop (a library using the GD library): http://phpimageworkshop.com/doc/17/resizing.html
Ex:
<?php
$myImage->resizeInPourcent(50, 50); // Resize to get 50% width and height