/* PHP正则提取图片img标记中的任意属性 */
$str = '
//1、取整个图片代码
preg_match('/]*?src\s*=\s*(\'|\")(.*?)\\1[^>]*?\/?\s*>/i',$str,$match);
echo $match[0];
//2、取width属性
preg_match('//i',$str,$match);
echo $match[1];
//3、取height属性
preg_match('//i',$str,$match);
echo $match[1];
//4、取src
preg_match('//i',$str,$match);
echo $match[1];
//1、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/20100516000.jpg")
print preg_replace('/()/i',"\${1}uc/images/\${3}",$str);
echo "
//2、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/20100516000.jpg",并省去宽和高
print preg_replace('/(/i',"\${1} \${2}uc/images/\${3}>",$str);
?>