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Get image width using url of the image

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I am trying to get the image width from the url of the image. Is that possible ??
What i am trying to do is, if a user uploads image from the editor and if the width of image uploaded is greater than 700px then i will resize the image and use that in place of the original one. I am grabbing all the images in the editor like this

$doc = new DOMDocument();
$doc->loadHTML($this->PageAdvancedPopup_html);
$imageTags = $doc->getElementsByTagName('img');
   foreach($imageTags as $tag) {
$imgs = $tag->getAttribute('src');
    echo "<img src='/$imgs' />";
}

Now how can i check the width of these image ??
Please help me I am stuck...


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