php正则取img标记中任意属性(正则替换去掉或改变

<?php
/正则取图片img标记中的任意属性/

$word = '<p height="22" align="cer">111 22</p> <img src="/upload/images/aaa.jpg" width="100"><div style="float:left;">中国人</div>';
//取整个图片代码
preg_match('/</simg/s+[^>]?src/s=/s(/'|/")(.?)//1[^>]?//?/s>/i',$word,$matches);
echo $matches[0];//结果<img src="/upload/images/aaa.jpg" width="100">

$word = '<p height="22" align="cer">111 22</p> <img height="60" src="/upload/images/aaa.jpg" width=100 style=><div style="float:left;">中国人</div>';
//取width
preg_match('/<img.+(width=/"?/d/"?).+>/i',$word,$matches);
echo $matches[1];

//取height
preg_match('/<img.+(height=/"?/d/"?).+>/i',$word,$matches);
echo $matches[1];

//取src
preg_match('/<img.+src=/"?(.+/.(jpg|gif|bmp|bnp|png))/"?.+>/i',$word,$matches);
echo $matches[1];

/正则替换去掉或改变图片img标记中的任意属性/
$str = '<p height="22" align="cer">111 22</p> <img height="60" src="/upload/images/aaa.jpg" width=100 style=><div style="float:left;">中国人</div>
<p height="22" align="cer">31313 224344</p> <img src="/upload/images/bbb.jpg" height="60" width=100 style=><div style="float:left;">1212121</div>';

//改变src属性(此处将原来的src="/upload/images/bbb.jpg"改变为src="/upload/_thumbs/Images/bbb.jpg")
print preg_replace('/(<img.+src=/"?.+)(images//)(.+/.(jpg|gif|bmp|bnp|png)/"?.+>)/i',"/${1}_thumbs/Images//${3}",$str);

/改变src属性,
此处将原来的src="/upload/images/bbb.jpg"改变为src="/upload/_thumbs/Images/bbb.jpg",并舍弃宽和高
(比如你想在前台显示缩略图,但数据库中存储的是原图的路径。为什么要舍弃宽高??你缩略图啊!还是原图的宽高,会怎样???)
/
print preg_replace('/(<img).+(src=/"?.+)images//(.+/.(jpg|gif|bmp|bnp|png)/"?).+>/i',"/${1} /${2}_thumbs/Images//${3}>",$str);
?>