function addImgHeightWidth($string='') {
$pattern = "/(<img\s+).*?src=((\".*?\")|(\'.*?\')|([^\s]*)).*?>/is";
$replacement = "<img width='350' height='350' src=$2>";
$finalStr = preg_replace($pattern, $replacement, $string); return $string; }
The above function will add image height width in image tag. This can be used to convert images to amp Valid images.