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$html = "<img data-s='300,640' data-type='jpeg' src='http://mmbiz.qpic.cn/mmbiz_jpg/AmZ8tGO5yRDFkcThZhpcSDjgqbQXOIqQSlk3hAvNJ9YfDibuVynR4x13HUm6mETaV2UQVibzw8rxYNu31YyxrDFg/0?wx_fmt=jpeg' data-ratio='0.66625' data-w='800'>";
$preg = '/<img.*src="(.*?)\/[0]"$/';
$html = "<img data-s='300,640' data-type='jpeg' src='http://mmbiz.qpic.cn/mmbiz_jpg/AmZ8tGO5yRDFkcThZhpcSDjgqbQXOIqQSlk3hAvNJ9YfDibuVynR4x13HUm6mETaV2UQVibzw8rxYNu31YyxrDFg/0?wx_fmt=jpeg' data-ratio='0.66625' data-w='800'>";
$preg = '/src=\'(.*?)(\?.+?)\'/';
echo preg_replace($preg,"src='$1'",$html);