Resizing a BLOB image in PHP before sending to client - php

Question

I have an image of which I am fetching from a database as a BLOB however I am sending the client the full size image of which is then resized on their side. The images can get very large so I would like to resize the image before it is sent to the client.
I currently have the following code:
if (!empty($row['img'])) {$img = $row['img'];}
$width = imagesx(imagecreatefromstring($img));
$height = imagesy(imagecreatefromstring($img));
$resizer = $width/200;
$newHeight = floor($height/$resizer);
$news = $news . "<div class='newsItem' style='min-height:".$newHeight."px;'>";
if (isset($img)) {$news = $news . "<img src='data:image/jpeg;base64,".base64_encode($img)."' width='200' height='".$newHeight."'>";}
$news = $news . "<h2>".$title."</h2><hr class='newsHr'><span>".$text."</span></div>";
What functions can I use to resize $img?

Answer 1

This should work for you. Example taken from this Manual
<?php
// Load
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($filename);
// Resize
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
// Output
imagejpeg($thumb);
?>
To convert BLOB mage to file use.
file_put_contents('/path/to/new/file_name', $my_blob);

Answer 2

Works with me!
<?php
function resize($blobImage, $toWidth, $toHeight) {
$gdImage = imagecreatefromstring($blobImage);
if ($gdImage) {
list($width, $height) = getimagesizefromstring($blobImage);
$gdRender = imagecreatetruecolor($toWidth, $toHeight);
$colorBgAlpha = imagecolorallocatealpha($gdRender, 0, 0, 0, 127);
imagecolortransparent($gdRender, $colorBgAlpha);
imagefill($gdRender, 0, 0, $colorBgAlpha);
imagecopyresampled($gdRender, $gdImage, 0, 0, 0, 0, $toWidth, $toHeight, $width, $height);
imagetruecolortopalette($gdRender, false, 255);
imagesavealpha($gdRender, true);
ob_start();
imagepng($gdRender);
$imageContents = ob_get_contents();
ob_end_clean();
imagedestroy($gdRender);
imagedestroy($gdImage);
return $imageContents;
}
}
$image = '<img src="data:image/jpeg;base64,'. base64_encode( resize($row['image_data'], 45, 45) ) . '" />';