how to resize image proportionally in php - php

Question

I would like to resize an image proportionally to 500px X 500px I found the below code from the net however the article didn't have an example of how to use the script, can someone just get me started on how to display the resized image?
$filename = 'test.png';
list($width, $height, $type, $attr) = getimagesize($filename);
$orig_w = $width;
$orig_h = $height;
$MIN_W = 500;
$MIN_H = 500;
$MAX_H = 500;
$MAX_W = 500;
function image_resize_up($orig_w, $orig_h, $MIN_W, $MIN_H){
$ratio = $orig_w * 1.0 / $orig_h;
$w_undersized = ($orig_w < $MIN_W);
$h_undersized = ($orig_h < $MIN_H);
if ($w_undersized OR $h_undersized)
{
$new_w = round( max($MIN_W, $ratio * $MIN_H) );
$new_h = round( max($MIN_H, $MIN_W / $ratio) );
return array('width' => $new_w, 'height' => $new_h);
}
return null;
}
function image_resize_down($orig_w, $orig_h, $MAX_W, $MAX_H){
$ratio = $orig_w * 1.0 / $orig_h;
$w_undersized = ($orig_w > $MAX_W);
$h_undersized = ($orig_h > $MAX_H);
if ($w_undersized OR $h_undersized)
{
$new_w = round( min($MAX_W, $ratio * $MAX_H) );
$new_h = round( min($MAX_H, $MAX_W / $ratio) );
return array('width' => $new_w, 'height' => $new_h);
}
return null;
}
echo $w_undersized;
I tried
echo "<img src=".$filename.$new_w.$new_h.">";//gives me undefined variable and the image isn't resized.

Answer 1

You have wrongly defined your attributes try that:
echo "<img src='".$filename."' style='width:".$new_w."; height:".$new_h."; '>";
Good Luck

Answer 2

First you need a function to crop the image so that width and height are equal:
function crop_image_square($filename, $_filename){
list($width, $height, $type) = getimagesize($filename);
$min = min($width, $height);
$x = ($width > $height) ? ($width-$height)/2 : 0;
$y = ($width < $height) ? ($height-$width)/2 : 0;
switch($type){
case IMG_GIF: $src = imagecreatefromgif($filename); break;
case IMG_JPG: $src = imagecreatefromjpeg($filename); break;
case IMG_PNG: $src = imagecreatefrompng($filename); break;
// and so on...
}
$dest = imagecreatetruecolor($min, $min);
imagecopy($dest, $src, 0, 0, $x, $y, $width, $height);
switch($type){
case IMG_GIF: imagegif($dest, $_filename); break;
case IMG_JPG: imagejpeg($dest, $_filename); break;
case IMG_PNG: imagepng($dest, $_filename); break;
// and so on...
}
imagedestroy($src);
imagedestroy($dest);
}
Then you may apply the function to one or more image(s):
crop_image_square("image_01.jpg", "image_01_cropped.jpg");
crop_image_square("image_02.jpg", "image_02_cropped.jpg");
crop_image_square("image_03.jpg", "image_03_cropped.jpg");
The PHP part is done. Displaying a resized version can be easily achieved with plain HTML, as you’ve pointed out:
<img src="image_01_cropped.jpg" width="500" height="500"/>
<img src="image_02_cropped.jpg" width="500" height="500"/>
<img src="image_03_cropped.jpg" width="500" height="500"/>

Answer 3

Working with images in PHP/GD can be tedious, which is why I wrote the SimpleImage library to make things less painless. It resolves many edge cases and gotchas that come with GD image manipulation.
Here's how to resize an image proportionally to fit in a 500x500 box:
// Load the image from image.jpg
$image = new \claviska\SimpleImage('image.jpg');
// Proportionally resize to fit inside a 500x500 box and save to result.jpg
$image->bestFit(500, 500)->toFile('result.jpg');
SimpleImage can be installed via Composer or linked manually. Details in the readme.

Answer 4

If you would like, you can use the library SimpleImage.
include('src/abeautifulsite/SimpleImage.php'); //Load the SimpleImage
$image = new SimpleImage(); //Create an instance.
$image->load('picture.jpg'); //Load the picture.jpg.
image->resize(500, 500); //Resize.
$image->save('picture2.jpg');//Save as picture2.jpg.