CODEWITHSUNDEEP
phpimage-processingimage-resizingimage-upload
Alex Ryans
Alex Ryans

Reputation: 1935

Resize image in PHP

I want to write some PHP code that automatically resizes any image uploaded via a form to 147x147px, but I have no idea how to go about it (I'm a relative PHP novice).

So far, I've got images uploading successfully, filetypes being recognized and names cleaned up, but I'd like to add the resize functionality into the code. For example, I've got a test image that is 2.3MB, and 1331x1331 in dimension, and I'd like the code to size it down, which I'm guessing will dramatically compress the file size of the image, too.

So far, I've got the following:

if ($_FILES) {
    //Put file properties into variables
    $file_name = $_FILES['profile-image']['name'];
    $file_size = $_FILES['profile-image']['size'];
    $file_tmp_name = $_FILES['profile-image']['tmp_name'];
    
    //Determine filetype
    switch ($_FILES['profile-image']['type']) {
        case 'image/jpeg': $ext = "jpg"; break;
        case 'image/png': $ext = "png"; break;
        default: $ext = ''; break;
    }
    
    if ($ext) {
        //Check filesize
        if ($file_size < 500000) {
            //Process file - clean up filename and move to safe location
            $n = "$file_name";
            $n = ereg_replace("[^A-Za-z0-9.]", "", $n);
            $n = strtolower($n);
            $n = "avatars/$n";
            move_uploaded_file($file_tmp_name, $n);
        } else {
            $bad_message = "Please ensure your chosen file is less than 5MB.";
        }
    } else {
        $bad_message = "Please ensure your image is of filetype .jpg or.png.";
    }
}

$query = "INSERT INTO users (image) VALUES ('$n')";
mysql_query($query) or die("Insert failed. " . mysql_error() . "<br />" . $query);

Upvotes: 130

Views: 468658

Answers (13)

Muhammad Abdullah
Muhammad Abdullah

Reputation: 4545

Simply use PHP's GD functions (like imagescale):

Syntax

imagescale ( $image , $new_width , $new_height )

Example

Step: 1

Read the file

$image_name =  'path_of_Image/Name_of_Image.jpg|png|gif';

Step: 2

Load the Image File

// jpeg
$image = imagecreatefromjpeg($image_name);

// png
$image = imagecreatefrompng($image_name);

// gif
$image = imagecreatefromgif($image_name);

Step: 3

Our Life-saver comes in '_' | Scale the image

$imgResized = imagescale($image , 500, 400); // width=500 and height = 400
//  $imgResized is our final product

Note: imagescale will work for (PHP 5 >= 5.5.0, PHP 7)

Step: 4

Save the Resized image to your desired directory.

// jpeg
imagejpeg($imgResized, 'path_of_Image/Name_of_Image_resized.jpg'); 

// png
imagepng($imgResized, 'path_of_Image/Name_of_Image_resized.png');

Source : Click to Read more

Upvotes: 63

Boycott A.I.
Boycott A.I.

Reputation: 18951

This resource(broken link) is also worth considering - some very tidy code that uses GD. However, I modified their final code snippet to create this function which meets the OPs requirements...

function store_uploaded_image($html_element_name, $new_img_width, $new_img_height) {
    
    $target_dir = "your-uploaded-images-folder/";
    $target_file = $target_dir . basename($_FILES[$html_element_name]["name"]);
    
    $image = new SimpleImage();
    $image->load($_FILES[$html_element_name]['tmp_name']);
    $image->resize($new_img_width, $new_img_height);
    $image->save($target_file);
    return $target_file; //return name of saved file in case you want to store it in you database or show confirmation message to user
    
}

You will also need to include this PHP file...

<?php
 
/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link: http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/
 
class SimpleImage {
 
   var $image;
   var $image_type;
 
   function load($filename) {
 
      $image_info = getimagesize($filename);
      $this->image_type = $image_info[2];
      if( $this->image_type == IMAGETYPE_JPEG ) {
 
         $this->image = imagecreatefromjpeg($filename);
      } elseif( $this->image_type == IMAGETYPE_GIF ) {
 
         $this->image = imagecreatefromgif($filename);
      } elseif( $this->image_type == IMAGETYPE_PNG ) {
 
         $this->image = imagecreatefrompng($filename);
      }
   }
   function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
 
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image,$filename,$compression);
      } elseif( $image_type == IMAGETYPE_GIF ) {
 
         imagegif($this->image,$filename);
      } elseif( $image_type == IMAGETYPE_PNG ) {
 
         imagepng($this->image,$filename);
      }
      if( $permissions != null) {
 
         chmod($filename,$permissions);
      }
   }
   function output($image_type=IMAGETYPE_JPEG) {
 
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image);
      } elseif( $image_type == IMAGETYPE_GIF ) {
 
         imagegif($this->image);
      } elseif( $image_type == IMAGETYPE_PNG ) {
 
         imagepng($this->image);
      }
   }
   function getWidth() {
 
      return imagesx($this->image);
   }
   function getHeight() {
 
      return imagesy($this->image);
   }
   function resizeToHeight($height) {
 
      $ratio = $height / $this->getHeight();
      $width = $this->getWidth() * $ratio;
      $this->resize($width,$height);
   }
 
   function resizeToWidth($width) {
      $ratio = $width / $this->getWidth();
      $height = $this->getheight() * $ratio;
      $this->resize($width,$height);
   }
 
   function scale($scale) {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
   }
 
   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;
   }      
 
}
?>

Upvotes: 29

Emiliano Barboza
Emiliano Barboza

Reputation: 485

private function getTempImage($url, $tempName){
  $tempPath = 'tempFilePath' . $tempName . '.png';
  $source_image = imagecreatefrompng($url); // check type depending on your necessities.
  $source_imagex = imagesx($source_image);
  $source_imagey = imagesy($source_image);
  $dest_imagex = 861; // My default value
  $dest_imagey = 96;  // My default value

  $dest_image = imagecreatetruecolor($dest_imagex, $dest_imagey);

  imagecopyresampled($dest_image, $source_image, 0, 0, 0, 0, $dest_imagex, $dest_imagey, $source_imagex, $source_imagey);

  imagejpeg($dest_image, $tempPath, 100);

  return $tempPath;

}

This is an adapted solution based on this great explanation. This guy made a step by step explanation. Hope all enjoy it.

Upvotes: 1

Daniel Doinov
Daniel Doinov

Reputation: 299

Here is an extended version of the answer @Ian Atkin' gave. I found it worked extremely well. For larger images that is :). You can actually make smaller images larger if you're not careful. Changes: - Supports jpg,jpeg,png,gif,bmp files - Preserves transparency for .png and .gif - Double checks if the the size of the original isnt already smaller - Overrides the image given directly (Its what I needed)

So here it is. The default values of the function are the "golden rule"

function resize_image($file, $w = 1200, $h = 741, $crop = false)
   {
       try {
           $ext = pathinfo(storage_path() . $file, PATHINFO_EXTENSION);
           list($width, $height) = getimagesize($file);
           // if the image is smaller we dont resize
           if ($w > $width && $h > $height) {
               return true;
           }
           $r = $width / $height;
           if ($crop) {
               if ($width > $height) {
                   $width = ceil($width - ($width * abs($r - $w / $h)));
               } else {
                   $height = ceil($height - ($height * abs($r - $w / $h)));
               }
               $newwidth = $w;
               $newheight = $h;
           } else {
               if ($w / $h > $r) {
                   $newwidth = $h * $r;
                   $newheight = $h;
               } else {
                   $newheight = $w / $r;
                   $newwidth = $w;
               }
           }
           $dst = imagecreatetruecolor($newwidth, $newheight);

           switch ($ext) {
               case 'jpg':
               case 'jpeg':
                   $src = imagecreatefromjpeg($file);
                   break;
               case 'png':
                   $src = imagecreatefrompng($file);
                   imagecolortransparent($dst, imagecolorallocatealpha($dst, 0, 0, 0, 127));
                   imagealphablending($dst, false);
                   imagesavealpha($dst, true);
                   break;
               case 'gif':
                   $src = imagecreatefromgif($file);
                   imagecolortransparent($dst, imagecolorallocatealpha($dst, 0, 0, 0, 127));
                   imagealphablending($dst, false);
                   imagesavealpha($dst, true);
                   break;
               case 'bmp':
                   $src = imagecreatefrombmp($file);
                   break;
               default:
                   throw new Exception('Unsupported image extension found: ' . $ext);
                   break;
           }
           $result = imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
           switch ($ext) {
               case 'bmp':
                   imagewbmp($dst, $file);
                   break;
               case 'gif':
                   imagegif($dst, $file);
                   break;
               case 'jpg':
               case 'jpeg':
                   imagejpeg($dst, $file);
                   break;
               case 'png':
                   imagepng($dst, $file);
                   break;
           }
           return true;
       } catch (Exception $err) {
           // LOG THE ERROR HERE 
           return false;
       }
   }

Upvotes: 3

danigore
danigore

Reputation: 416

(IMPORTANT: In the case of animation (animated webp or gif) resizing, the result will be a not animated, but resized image from the first frame! (The original animation remains intact...)

I created this to my php 7.2 project (example imagebmp sure (PHP 7 >= 7.2.0) :php/manual/function.imagebmp) about techfry.com/php-tutorial, with GD2, (so nothing 3rd party library) and very similar to the answer of Nico Bistolfi, but works with the all five basic image mimetype (png, jpeg, webp, bmp and gif), creating a new resized file, without modifying the original one, and the all stuff in one function and ready to use (copy and paste to your project). (You can set the extension of the new file with the fifth parameter, or just leave it, if you want keep the orignal):

function createResizedImage(
    string $imagePath = '',
    string $newPath = '',
    int $newWidth = 0,
    int $newHeight = 0,
    string $outExt = 'DEFAULT'
) : ?string
{
    if (!$newPath or !file_exists ($imagePath)) {
        return null;
    }

    $types = [IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_GIF, IMAGETYPE_BMP, IMAGETYPE_WEBP];
    $type = exif_imagetype ($imagePath);

    if (!in_array ($type, $types)) {
        return null;
    }

    list ($width, $height) = getimagesize ($imagePath);

    $outBool = in_array ($outExt, ['jpg', 'jpeg', 'png', 'gif', 'bmp', 'webp']);

    switch ($type) {
        case IMAGETYPE_JPEG:
            $image = imagecreatefromjpeg ($imagePath);
            if (!$outBool) $outExt = 'jpg';
            break;
        case IMAGETYPE_PNG:
            $image = imagecreatefrompng ($imagePath);
            if (!$outBool) $outExt = 'png';
            break;
        case IMAGETYPE_GIF:
            $image = imagecreatefromgif ($imagePath);
            if (!$outBool) $outExt = 'gif';
            break;
        case IMAGETYPE_BMP:
            $image = imagecreatefrombmp ($imagePath);
            if (!$outBool) $outExt = 'bmp';
            break;
        case IMAGETYPE_WEBP:
            $image = imagecreatefromwebp ($imagePath);
            if (!$outBool) $outExt = 'webp';
    }

    $newImage = imagecreatetruecolor ($newWidth, $newHeight);

    //TRANSPARENT BACKGROUND
    $color = imagecolorallocatealpha ($newImage, 0, 0, 0, 127); //fill transparent back
    imagefill ($newImage, 0, 0, $color);
    imagesavealpha ($newImage, true);

    //ROUTINE
    imagecopyresampled ($newImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);

    // Rotate image on iOS
    if(function_exists('exif_read_data') && $exif = exif_read_data($imagePath, 'IFD0'))
    {
        if(isset($exif['Orientation']) && isset($exif['Make']) && !empty($exif['Orientation']) && preg_match('/(apple|ios|iphone)/i', $exif['Make'])) {
            switch($exif['Orientation']) {
                case 8:
                    if ($width > $height) $newImage = imagerotate($newImage,90,0);
                    break;
                case 3:
                    $newImage = imagerotate($newImage,180,0);
                    break;
                case 6:
                    $newImage = imagerotate($newImage,-90,0);
                    break;
            }
        }
    }

    switch (true) {
        case in_array ($outExt, ['jpg', 'jpeg']): $success = imagejpeg ($newImage, $newPath);
            break;
        case $outExt === 'png': $success = imagepng ($newImage, $newPath);
            break;
        case $outExt === 'gif': $success = imagegif ($newImage, $newPath);
            break;
        case  $outExt === 'bmp': $success = imagebmp ($newImage, $newPath);
            break;
        case  $outExt === 'webp': $success = imagewebp ($newImage, $newPath);
    }

    if (!$success) {
        return null;
    }

    return $newPath;
}

Upvotes: 10

Amir Forsati
Amir Forsati

Reputation: 5968

I would suggest an easy way:

function resize($file, $width, $height) {
    switch(pathinfo($file)['extension']) {
        case "png": return imagepng(imagescale(imagecreatefrompng($file), $width, $height), $file);
        case "gif": return imagegif(imagescale(imagecreatefromgif($file), $width, $height), $file);
        default : return imagejpeg(imagescale(imagecreatefromjpeg($file), $width, $height), $file);
    }
}

Upvotes: 1

Gayan Sandamal
Gayan Sandamal

Reputation: 337

I found a mathematical way to get this job done

Github repo - https://github.com/gayanSandamal/easy-php-image-resizer

Live example - https://plugins.nayague.com/easy-php-image-resizer/

<?php
//path for the image
$source_url = '2018-04-01-1522613288.PNG';

//separate the file name and the extention
$source_url_parts = pathinfo($source_url);
$filename = $source_url_parts['filename'];
$extension = $source_url_parts['extension'];

//define the quality from 1 to 100
$quality = 10;

//detect the width and the height of original image
list($width, $height) = getimagesize($source_url);
$width;
$height;

//define any width that you want as the output. mine is 200px.
$after_width = 200;

//resize only when the original image is larger than expected with.
//this helps you to avoid from unwanted resizing.
if ($width > $after_width) {

    //get the reduced width
    $reduced_width = ($width - $after_width);
    //now convert the reduced width to a percentage and round it to 2 decimal places
    $reduced_radio = round(($reduced_width / $width) * 100, 2);

    //ALL GOOD! let's reduce the same percentage from the height and round it to 2 decimal places
    $reduced_height = round(($height / 100) * $reduced_radio, 2);
    //reduce the calculated height from the original height
    $after_height = $height - $reduced_height;

    //Now detect the file extension
    //if the file extension is 'jpg', 'jpeg', 'JPG' or 'JPEG'
    if ($extension == 'jpg' || $extension == 'jpeg' || $extension == 'JPG' || $extension == 'JPEG') {
        //then return the image as a jpeg image for the next step
        $img = imagecreatefromjpeg($source_url);
    } elseif ($extension == 'png' || $extension == 'PNG') {
        //then return the image as a png image for the next step
        $img = imagecreatefrompng($source_url);
    } else {
        //show an error message if the file extension is not available
        echo 'image extension is not supporting';
    }

    //HERE YOU GO :)
    //Let's do the resize thing
    //imagescale([returned image], [width of the resized image], [height of the resized image], [quality of the resized image]);
    $imgResized = imagescale($img, $after_width, $after_height, $quality);

    //now save the resized image with a suffix called "-resized" and with its extension. 
    imagejpeg($imgResized, $filename . '-resized.'.$extension);

    //Finally frees any memory associated with image
    //**NOTE THAT THIS WONT DELETE THE IMAGE
    imagedestroy($img);
    imagedestroy($imgResized);
}
?>

Upvotes: 4

Jarrod
Jarrod

Reputation: 9465

I created an easy-to-use library for image resizing. It can be found here on Github.

An example of how to use the library:

// Include PHP Image Magician library
require_once('php_image_magician.php');

// Open JPG image
$magicianObj = new imageLib('racecar.jpg');

// Resize to best fit then crop (check out the other options)
$magicianObj -> resizeImage(100, 200, 'crop');

// Save resized image as a PNG (or jpg, bmp, etc)
$magicianObj -> saveImage('racecar_small.png');

Other features, should you need them, are:

  • Quick and easy resize - Resize to landscape, portrait, or auto
  • Easy crop
  • Add text
  • Quality adjustment
  • Watermarking
  • Shadows and reflections
  • Transparency support
  • Read EXIF metadata
  • Borders, Rounded corners, Rotation
  • Filters and effects
  • Image sharpening
  • Image type conversion
  • BMP support

Upvotes: 7

Sajid Sayyad
Sajid Sayyad

Reputation: 37

You can give a try to TinyPNG PHP library. Using this library your image gets optimized automatically during resizing process. All you need to install the library and get an API key from https://tinypng.com/developers. To install a library, run the below command.

composer require tinify/tinify

After that, your code is as follows.

require_once("vendor/autoload.php");

\Tinify\setKey("YOUR_API_KEY");

$source = \Tinify\fromFile("large.jpg"); //image to be resize
$resized = $source->resize(array(
    "method" => "fit",
    "width" => 150,
    "height" => 100
));
$resized->toFile("thumbnail.jpg"); //resized image

I have a written a blog on the same topic http://artisansweb.net/resize-image-php-using-tinypng

Upvotes: 0

user285594
user285594

Reputation:

ZF cake:

<?php

class FkuController extends Zend_Controller_Action {

  var $image;
  var $image_type;

  public function store_uploaded_image($html_element_name, $new_img_width, $new_img_height) {

    $target_dir = APPLICATION_PATH  . "/../public/1/";
    $target_file = $target_dir . basename($_FILES[$html_element_name]["name"]);

    //$image = new SimpleImage();
    $this->load($_FILES[$html_element_name]['tmp_name']);
    $this->resize($new_img_width, $new_img_height);
    $this->save($target_file);
    return $target_file; 
    //return name of saved file in case you want to store it in you database or show confirmation message to user



  public function load($filename) {

      $image_info = getimagesize($filename);
      $this->image_type = $image_info[2];
      if( $this->image_type == IMAGETYPE_JPEG ) {

         $this->image = imagecreatefromjpeg($filename);
      } elseif( $this->image_type == IMAGETYPE_GIF ) {

         $this->image = imagecreatefromgif($filename);
      } elseif( $this->image_type == IMAGETYPE_PNG ) {

         $this->image = imagecreatefrompng($filename);
      }
   }
  public function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {

      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image,$filename,$compression);
      } elseif( $image_type == IMAGETYPE_GIF ) {

         imagegif($this->image,$filename);
      } elseif( $image_type == IMAGETYPE_PNG ) {

         imagepng($this->image,$filename);
      }
      if( $permissions != null) {

         chmod($filename,$permissions);
      }
   }
  public function output($image_type=IMAGETYPE_JPEG) {

      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image);
      } elseif( $image_type == IMAGETYPE_GIF ) {

         imagegif($this->image);
      } elseif( $image_type == IMAGETYPE_PNG ) {

         imagepng($this->image);
      }
   }
  public function getWidth() {

      return imagesx($this->image);
   }
  public function getHeight() {

      return imagesy($this->image);
   }
  public function resizeToHeight($height) {

      $ratio = $height / $this->getHeight();
      $width = $this->getWidth() * $ratio;
      $this->resize($width,$height);
   }

  public function resizeToWidth($width) {
      $ratio = $width / $this->getWidth();
      $height = $this->getheight() * $ratio;
      $this->resize($width,$height);
   }

  public function scale($scale) {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
   }

  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;
   }

  public function savepicAction() {
    ini_set('display_errors', 1);
    ini_set('display_startup_errors', 1);
    error_reporting(E_ALL);

    $this->_helper->layout()->disableLayout();
    $this->_helper->viewRenderer->setNoRender();
    $this->_response->setHeader('Access-Control-Allow-Origin', '*');

    $this->db = Application_Model_Db::db_load();        
    $ouser = $_POST['ousername'];


      $fdata = 'empty';
      if (isset($_FILES['picture']) && $_FILES['picture']['size'] > 0) {
        $file_size = $_FILES['picture']['size'];
        $tmpName  = $_FILES['picture']['tmp_name'];  

        //Determine filetype
        switch ($_FILES['picture']['type']) {
            case 'image/jpeg': $ext = "jpg"; break;
            case 'image/png': $ext = "png"; break;
            case 'image/jpg': $ext = "jpg"; break;
            case 'image/bmp': $ext = "bmp"; break;
            case 'image/gif': $ext = "gif"; break;
            default: $ext = ''; break;
        }

        if($ext) {
          //if($file_size<400000) {  
            $img = $this->store_uploaded_image('picture', 90,82);
            //$fp      = fopen($tmpName, 'r');
            $fp = fopen($img, 'r');
            $fdata = fread($fp, filesize($tmpName));        
            $fdata = base64_encode($fdata);
            fclose($fp);

          //}
        }

      }

      if($fdata=='empty'){

      }
      else {
        $this->db->update('users', 
          array(
            'picture' => $fdata,             
          ), 
          array('username=?' => $ouser ));        
      }



  }

Upvotes: 1

Tunde Michael
Tunde Michael

Reputation: 364

If you dont care about the aspect ration (i.e you want to force the image to a particular dimension), here is a simplified answer

// for jpg 
function resize_imagejpg($file, $w, $h) {
   list($width, $height) = getimagesize($file);
   $src = imagecreatefromjpeg($file);
   $dst = imagecreatetruecolor($w, $h);
   imagecopyresampled($dst, $src, 0, 0, 0, 0, $w, $h, $width, $height);
   return $dst;
}

 // for png
function resize_imagepng($file, $w, $h) {
   list($width, $height) = getimagesize($file);
   $src = imagecreatefrompng($file);
   $dst = imagecreatetruecolor($w, $h);
   imagecopyresampled($dst, $src, 0, 0, 0, 0, $w, $h, $width, $height);
   return $dst;
}

// for gif
function resize_imagegif($file, $w, $h) {
   list($width, $height) = getimagesize($file);
   $src = imagecreatefromgif($file);
   $dst = imagecreatetruecolor($w, $h);
   imagecopyresampled($dst, $src, 0, 0, 0, 0, $w, $h, $width, $height);
   return $dst;
}

Now let's handle the upload part. First step, upload the file to your desired directory. Then called one of the above functions based on file type (jpg, png or gif) and pass the absolute path of your uploaded file as below:

 // jpg  change the dimension 750, 450 to your desired values
 $img = resize_imagejpg('path/image.jpg', 750, 450);

The return value $img is a resource object. We can save to a new location or override the original as below:

 // again for jpg
 imagejpeg($img, 'path/newimage.jpg');

Hope this helps someone. Check these links for more on resizing Imagick::resizeImage and imagejpeg()

Upvotes: 15

Er.gaurav soni
Er.gaurav soni

Reputation: 157

I hope is will work for you.

/**
         * Image re-size
         * @param int $width
         * @param int $height
         */
        function ImageResize($width, $height, $img_name)
        {
                /* Get original file size */
                list($w, $h) = getimagesize($_FILES['logo_image']['tmp_name']);


                /*$ratio = $w / $h;
                $size = $width;

                $width = $height = min($size, max($w, $h));

                if ($ratio < 1) {
                    $width = $height * $ratio;
                } else {
                    $height = $width / $ratio;
                }*/

                /* Calculate new image size */
                $ratio = max($width/$w, $height/$h);
                $h = ceil($height / $ratio);
                $x = ($w - $width / $ratio) / 2;
                $w = ceil($width / $ratio);
                /* set new file name */
                $path = $img_name;


                /* Save image */
                if($_FILES['logo_image']['type']=='image/jpeg')
                {
                    /* Get binary data from image */
                    $imgString = file_get_contents($_FILES['logo_image']['tmp_name']);
                    /* create image from string */
                    $image = imagecreatefromstring($imgString);
                    $tmp = imagecreatetruecolor($width, $height);
                    imagecopyresampled($tmp, $image, 0, 0, $x, 0, $width, $height, $w, $h);
                    imagejpeg($tmp, $path, 100);
                }
                else if($_FILES['logo_image']['type']=='image/png')
                {
                    $image = imagecreatefrompng($_FILES['logo_image']['tmp_name']);
                    $tmp = imagecreatetruecolor($width,$height);
                    imagealphablending($tmp, false);
                    imagesavealpha($tmp, true);
                    imagecopyresampled($tmp, $image,0,0,$x,0,$width,$height,$w, $h);
                    imagepng($tmp, $path, 0);
                }
                else if($_FILES['logo_image']['type']=='image/gif')
                {
                    $image = imagecreatefromgif($_FILES['logo_image']['tmp_name']);

                    $tmp = imagecreatetruecolor($width,$height);
                    $transparent = imagecolorallocatealpha($tmp, 0, 0, 0, 127);
                    imagefill($tmp, 0, 0, $transparent);
                    imagealphablending($tmp, true); 

                    imagecopyresampled($tmp, $image,0,0,0,0,$width,$height,$w, $h);
                    imagegif($tmp, $path);
                }
                else
                {
                    return false;
                }

                return true;
                imagedestroy($image);
                imagedestroy($tmp);
        }

Upvotes: 9

Ian Atkin
Ian Atkin

Reputation: 6366

You need to use either PHP's ImageMagick or GD functions to work with images.

With GD, for example, it's as simple as...

function resize_image($file, $w, $h, $crop=FALSE) {
    list($width, $height) = getimagesize($file);
    $r = $width / $height;
    if ($crop) {
        if ($width > $height) {
            $width = ceil($width-($width*abs($r-$w/$h)));
        } else {
            $height = ceil($height-($height*abs($r-$w/$h)));
        }
        $newwidth = $w;
        $newheight = $h;
    } else {
        if ($w/$h > $r) {
            $newwidth = $h*$r;
            $newheight = $h;
        } else {
            $newheight = $w/$r;
            $newwidth = $w;
        }
    }
    $src = imagecreatefromjpeg($file);
    $dst = imagecreatetruecolor($newwidth, $newheight);
    imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

    return $dst;
}

And you could call this function, like so...

$img = resize_image(‘/path/to/some/image.jpg’, 200, 200);

From personal experience, GD's image resampling does dramatically reduce file size too, especially when resampling raw digital camera images.

Upvotes: 184

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