function is_webp($hdr) {
return substr($hdr, 0, 4) == 'RIFF' &&
substr($hdr, 8, 4) == 'WEBP';
}
// Getting width and height of WEBP image PHP's GD lib. Works even in PHP lower than v5.5.
function get_webp_size($fn) {
$w = 0;
$h = 0;
if ($f = @fopen($fn, 'rb')) {
$hdr = fread($f, 32);
fclose($f);
if (strlen($hdr) >= 30) {
$w = unpack('C3b', substr($hdr, 24, 3));
$w = ($w['b1'] + $w['b2']*256 + $w['b3']*65536) + 1;
$h = unpack('C3b', substr($hdr, 27, 3));
$h = ($h['b1'] + $h['b2']*256 + $h['b3']*65536) + 1;
}
}
return array($w, $h);
}
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