How can I resize an uploaded image in PHP

Question

I am currently using this code so users can upload images to my site

$allowed_filetypes = array('.jpg','.gif','.bmp','.png','.jpeg','.JPG','.PNG','.BIF','.GIF','.JPEG'); // These will be the types of file that will pass the validation.
$max_filesize = 524288; //  filesize in BYTES (currently 0.5MB).
$uploadpath = "/home/path/to/file/files/avatars/$_SESSION[user]";
$posted9 = hash('md5',$_SESSION["user"]).$ext; /* not for security mind you. */
// Upload the file to your specified path.
        $f = file_put_contents(
            $upload_path . $posted9,
            file_get_contents('php://input')
            );
        if($f)
    $m="Avatar updated<br/>"; // It worked.
  else
     $m="There was an error during the file upload.  Please try again."; // It failed :(.

However, when the images are rezised to fit inside the comments on my website, they become distorted and lose their quality.

How using PHP can I resize the images so that the quality is maintained?

There are plenty of tutorials and samples on Google. Did you even bother to research it? There are also countless questions of that type on StackOverflow too... — BenM, Jan 31 '14 at 20:05
You're asking about resizing images, but only show code for uploading images... and find a better method for testing filetype than a long array of case-sensitive file extensions — Mark Baker, Jan 31 '14 at 20:06

score 1 · Answer 1 · answered Jan 31 '14 at 20:09

   public function resize($width,$height) {
    $new_image = imagecreatetruecolor($width, $height);
    imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
  $this->image = $new_image;
  }

http://us3.php.net/imagecopyresampled

score 1 · Accepted Answer · edited Feb 08 '17 at 14:50

<?php

// Url of the file
$url = "/homepages/0/d502303335/htdocs/foo.jpg";

// Set a maximum height and width, I used the ones on your picture
$width = 49;
$height = 47;


// Get new dimensions
list($width_orig, $height_orig) = getimagesize($url);

// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($url);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

// Output, You can use another url, In my case i just overwrite the picture
imagejpeg($image_p, $url);

?>

Here's the result: http://www.filmgratuiti.org/varie/cenBqHxMD90Q2.jpg
Much more better then your's

So basically after you have uploaded the file you run my code and you are good to go

How can I resize an uploaded image in PHP

2 Answers2