PHP - Detecting image filesize before saving image - php

Question

I am using the following code to save an image from a URL but sometimes the image URL is bad and there is no image there, OR there is an issue with the image and it saves a zero size file.
<?php
file_put_contents ("/var/www/html/images/" . $character . ".jpg",
file_get_contents($image));
I need to try and find a way to stop this happening as this creates a problem (saving zero size files).
I have tried this, but it still seems to be happening:
$filesize = file_put_contents ("/var/www/html/images/" . $character . ".jpg",
file_get_contents($image));
if (($filesize < 10) || ($filesize == "")) {
echo "Error";
}
Could anyone recommend a more reliable way to do this?

Answer 1

Imagick package has methods for doing this
Imagick::getImageGeometry() - returns width and height of an image, or throws an exception.
function isValidImage($filename)
{
if (!fileexists($filename) return false;
if (filesize($filename) == 0) return false;
$image = new imagick($filename);
$img=$image->getImageGeometry();
return ($img['width'] > 0 && $img['height'] > 0);
}
EDIT: I have updated my answer with more checks

Answer 2

I have tried to get an image size by URL. I have get_headers() function to get the image size. Here is an example which is given below:
function checkImageSize($imageUrl){
if(!empty($imageUrl)){
$file_headers = #get_headers($imageUrl, 1); // it gives all header values .
// for image size, we use **Content-Length** for size.
$sizeInKB = round($file_headers['Content-Length'] / 1024, 2));
return $sizeInKB;
} else {
return 0;
}
}
$imageSize =checkImageSize($imageUrl);
if($imageSize<=$conditionalSize){
// upload code
} else {
// error msg
}