Resize images in PHP without using third-party libraries?

Question

In one of my applications, I'm using the code snippet below to copy uploaded images to a directory. It works fine but copying large images (> 2MB) takes more time than ideal and I really don't need images this big, so, I'm looking for a way to resize the images. How to achieve this using PHP?

<?php

$uploadDirectory = 'images/0001/';
$randomNumber = rand(0, 99999); 
$filename = basename($_FILES['userfile']['name']);
$filePath = $uploadDirectory.md5($randomNumber.$filename);

// Check if the file was sent through HTTP POST.

if (is_uploaded_file($_FILES['userfile']['tmp_name']) == true) {

    // Validate the file size, accept files under 5 MB (~5e+6 bytes).

    if ($_FILES['userfile']['size'] <= 5000000) {

        // Move the file to the path specified.

        if (move_uploaded_file($_FILES['userfile']['tmp_name'], $filePath) == true) {

            // ...

        }

    }

}

?>

http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/ — Ghostman, Mar 10 '12 at 22:06
check file size *before* upload, http://stackoverflow.com/questions/4112575/client-checking-file-size-using-html5 — Teson, Mar 10 '12 at 22:07
possible duplicate of [Resize image on server](http://stackoverflow.com/questions/7911293/resize-image-on-server) — Phil, Mar 10 '12 at 22:29
I've already seen most of those tutorials,i i've created my own code to resize JPEG images,but the problem is that this code is linked to an iphone application,so i'm a bit confused,if it's can any of you provide some sample code using the code i've pasted! — Mateus, Mar 10 '12 at 22:39
@MateusNunes I don't see anywhere you're performing the resize in the code you supplied. Show us your is_uploaded_file() function and your move_uploaded_file function. It's working has nothing to do with iphone or not. PHP is *server* side. — Chibueze Opata, Mar 11 '12 at 09:51
Possible duplicate of [resize image in PHP](http://stackoverflow.com/questions/14649645/resize-image-in-php) — Kevin Brown-Silva, Jan 01 '17 at 17:47

Mateus · Accepted Answer · 2017-03-23T22:45:58.290

Finally, I've discovered a way that fit my needs. The following snippet will resize an image to the specified width, automatically calculating the height in order to keep the proportion.

$image = $_FILES["image"]["tmp_name"];
$resizedDestination = $uploadDirectory.md5($randomNumber.$filename)."_RESIZED.jpg";

copy($_FILES, $resizedDestination);

$imageSize = getImageSize($image);
$imageWidth = $imageSize[0];
$imageHeight = $imageSize[1];

$DESIRED_WIDTH = 100;
$proportionalHeight = round(($DESIRED_WIDTH * $imageHeight) / $imageWidth);

$originalImage = imageCreateFromJPEG($image);

$resizedImage = imageCreateTrueColor($DESIRED_WIDTH, $proportionalHeight);

imageCopyResampled($images_fin, $originalImage, 0, 0, 0, 0, $DESIRED_WIDTH+1, $proportionalHeight+1, $imageWidth, $imageHeight);
imageJPEG($resizedImage, $resizedDestination);

imageDestroy($originalImage);
imageDestroy($resizedImage);

To anyone else seeking a complete example, create two files:

<!-- send.html -->

<html>

<head>

    <title>Simple File Upload</title>

</head>

<body>

    <center>

        <div style="margin-top:50px; padding:20px; border:1px solid #CECECE;">

            Select an image.

            <br/>
            <br/>

            <form action="receive.php" enctype="multipart/form-data" method="post">
                <input type="file" name="image" size="40">
                <input type="submit" value="Send">
            </form>

        </div>

    </center>

</body>

<?php

// receive.php

$randomNumber = rand(0, 99999);
$uploadDirectory = "images/";
$filename = basename($_FILES['file_contents']['name']);
$destination = $uploadDirectory.md5($randomNumber.$filename).".jpg";

echo "File path:".$filePath."<br/>";

if (is_uploaded_file($_FILES["image"]["tmp_name"]) == true) {

    echo "File successfully received through HTTP POST.<br/>";

    // Validate the file size, accept files under 5 MB (~5e+6 bytes).

    if ($_FILES['image']['size'] <= 5000000) {

        echo "File size: ".$_FILES["image"]["size"]." bytes.<br/>";

        // Resize and save the image.

        $image = $_FILES["image"]["tmp_name"];
        $resizedDestination = $uploadDirectory.md5($randomNumber.$filename)."_RESIZED.jpg";

        copy($_FILES, $resizedDestination);

        $imageSize = getImageSize($image);
        $imageWidth = $imageSize[0];
        $imageHeight = $imageSize[1];

        $DESIRED_WIDTH = 100;
        $proportionalHeight = round(($DESIRED_WIDTH * $imageHeight) / $imageWidth);

        $originalImage = imageCreateFromJPEG($image);

        $resizedImage = imageCreateTrueColor($DESIRED_WIDTH, $proportionalHeight);

        imageCopyResampled($images_fin, $originalImage, 0, 0, 0, 0, $DESIRED_WIDTH+1, $proportionalHeight+1, $imageWidth, $imageHeight);
        imageJPEG($resizedImage, $resizedDestination);

        imageDestroy($originalImage);
        imageDestroy($resizedImage);

        // Save the original image.

        if (move_uploaded_file($_FILES['image']['tmp_name'], $destination) == true) {

            echo "Copied the original file to the specified destination.<br/>";

        }

    }

}

?>

@Nimrod007, we can replace the transparency with a white colour. That would be "safe" — Deval Khandelwal, Jan 01 '15 at 10:05
you shall indicate copy function requiere allow_url_open in php.ini enabled — Fernando Torres, Jan 03 '20 at 22:58

TURTLE · Answer 2 · 2021-03-14T02:24:52.173

10

I made a small function to resize images, the function is below:

function resize_image($path, $width, $height, $update = false) {
   $size  = getimagesize($path);// [width, height, type index]
   $types = array(1 => 'gif', 2 => 'jpeg', 3 => 'png');
   if ( array_key_exists($size['2'], $types) ) {
      $load        = 'imagecreatefrom' . $types[$size['2']];
      $save        = 'image'           . $types[$size['2']];
      $image       = $load($path);
      $resized     = imagecreatetruecolor($width, $height);
      $transparent = imagecolorallocatealpha($resized, 0, 0, 0, 127);
      imagesavealpha($resized, true);
      imagefill($resized, 0, 0, $transparent);
      imagecopyresampled($resized, $image, 0, 0, 0, 0, $width, $height, $size['0'], $size['1']);
      imagedestroy($image);
      return $save($resized, $update ? $path : null);
   }
}

And here's how you use it:

if ( resize_image('dir/image.png', 50, 50, true) ) {// resize image.png to 50x50
   echo 'image resized!';
}

edited Mar 14 '21 at 02:24

answered Dec 29 '13 at 01:33

TURTLE

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Nice script, but $img_base is returning a resource id. Now how do we save the modified image? – The Duke Of Marshall שלום Dec 29 '13 at 19:57
Updated to save the image as well. – TURTLE Dec 31 '13 at 02:38
1

Good script, though I think it needs a case "jpg" too, as it doesn't recognise that extension. – RichardB Jul 19 '15 at 14:11
I've added the jpg case as I hit that issue too – tim.baker Feb 27 '17 at 16:32
I would suggest using `imagecopyresampled` instead of `imagecopyresized` (same signature) it allows smoother edges up on resizing (especially for pngs). – kursus Jul 22 '20 at 10:53

score 8 · Answer 3 · answered Jan 07 '14 at 09:59

8

there is 1 very simple image re-size function for all image types that keeps transparency and is very easy to use

check out :

https://github.com/Nimrod007/PHP_image_resize

hope this helps

answered Jan 07 '14 at 09:59

Nimrod007

9,825
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71

is there a call back function for when the image size function completes? For example... I'd like to run code Only If the image resize occurs. – floor Feb 23 '15 at 19:30

score 3 · Answer 4 · answered Mar 10 '12 at 22:36

3

ImageMagick is the fastest and probably the best way to resize images in PHP. Check out different examples here. This sample shows how to resize and image on upload.

answered Mar 10 '12 at 22:36

Chibueze Opata

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2

Why go through the overhead of executing another process when you can use a proven library like GD? – Overv Mar 10 '12 at 22:38
4

@Overv Speed. GD is quite slower http://sven.webiny.com/php-gd-vs-imagemagick-benchmark/. – Chibueze Opata Mar 10 '12 at 22:47

score 1 · Answer 5 · answered May 21 '14 at 00:35

Thanks to Mateus Nunes! i edited his work a bit to get transparent pngs working:

$source         = $_FILES["..."]["tmp_name"];
$destination    = 'abc/def/ghi.png';
$maxsize        = 45;

$size = getimagesize($source);
$width_orig = $size[0];
$height_orig = $size[1];
unset($size);
$height = $maxsize+1;
$width = $maxsize;
while($height > $maxsize){
    $height = round($width*$height_orig/$width_orig);
    $width = ($height > $maxsize)?--$width:$width;
}
unset($width_orig,$height_orig,$maxsize);
$images_orig    = imagecreatefromstring( file_get_contents($source) );
$photoX         = imagesx($images_orig);
$photoY         = imagesy($images_orig);
$images_fin     = imagecreatetruecolor($width,$height);
imagesavealpha($images_fin,true);
$trans_colour   = imagecolorallocatealpha($images_fin,0,0,0,127);
imagefill($images_fin,0,0,$trans_colour);
unset($trans_colour);
ImageCopyResampled($images_fin,$images_orig,0,0,0,0,$width+1,$height+1,$photoX,$photoY);
unset($photoX,$photoY,$width,$height);
imagepng($images_fin,$destination);
unset($destination);
ImageDestroy($images_orig);
ImageDestroy($images_fin);

score 0 · Answer 6 · answered Jun 20 '12 at 11:10

0

You could also use an x*y/width method for resizing and then calling imagecopyresampled() like is shown at http://www.virtualsecrets.com/upload-resize-image-php-mysql.html That page also puts images (after resizing) into mySQL via the PDO.

answered Jun 20 '12 at 11:10

FellowCoder

51
1
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Resize images in PHP without using third-party libraries?

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