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tilayealemu/largest-image-in-webpage.php

Last active May 25, 2019 20:54
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Get largest image in html page using php
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largest-image-in-webpage.php
<?php
// example call: http://localhost/largest.php?url_without_http=bbc.co.uk
$url = $_GET['url_without_http'];
$largest = get_largest_img("http://" . $url);
$embed = empty($largest) ? "Suitable image not found" : "<img src='" . $largest . "'>";
echo("<html><body>" . $embed . "</body></html>");
function get_largest_img($url) {
libxml_use_internal_errors(true);
$html = file_get_contents($url);
$dom = new DOMDocument();
$dom->loadHTML($html);
$imgs = $dom->getElementsByTagname('img');
$largest = "";
$largest_area = 0;
foreach ($imgs as $img) {
$img_url = $img->getAttribute("src");
if (empty($img_url)){
continue;
}
if (substr( $img_url, 0, 2 ) === "//"){
$img_url = "http:" . $img_url;
} else if (substr( $img_url, 0, 1 ) === "/"){
$img_url = $url . $img_url;
}
$size = getimagesize($img_url);
if (is_suitable($size)) {
$width = $size[0];
$height = $size[1];
if ($width*$height > $largest_area) {
$largest = $img_url;
$largest_area = $width*$height;
}
}
}
return $largest;
}
function is_suitable($size) {
// no image for some reason
if (is_null($size)) {
return false;
}
$width = $size[0];
$height = $size[1];
// long images are uninteresting (eg. they can be advert banners)
if ($width/$height > 10 || $width/$height < 0.1) {
return false;
}
return true;
}
?>
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