<?php
/*正則取圖片img標(biāo)記中的任意屬性*/

$word = '<p height="22" align="cenetr">111 22</p> <img src="/upload/images/aaa.jpg" width="100"><div style="float:left;">中國(guó)人</div>';
//取整個(gè)圖片代碼
preg_match('/</s*img/s+[^>]*?src/s*=/s*(/'|/")(.*?)//1[^>]*?//?/s*>/i',$word,$matches);
echo $matches[0];//結(jié)果：<img src="/upload/images/aaa.jpg" width="100">

$word = '<p height="22" align="cenetr">111 22</p> <img height="60" src="/upload/images/aaa.jpg" width=100 style=><div style="float:left;">中國(guó)人</div>';
//取width
preg_match('/<img.+(width=/"?/d*/"?).+>/i',$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];

/*正則替換去掉或改變圖片img標(biāo)記中的任意屬性***************************************************************/
$str = '<p height="22" align="cenetr">111 22</p> <img height="60" src="/upload/images/aaa.jpg" width=100 style=><div style="float:left;">中國(guó)人</div>
<p height="22" align="cenetr">31313 224344</p> <img src="/upload/images/bbb.jpg" height="60" width=100 style=><div style="float:left;">1212121</div>';

//改變src屬性(此處將原來(lái)的src="/upload/images/bbb.jpg"改變?yōu)閟rc="/upload/_thumbs/Images/bbb.jpg")
print preg_replace('/(<img.+src=/"?.+)(images//)(.+/.(jpg|gif|bmp|bnp|png)/"?.+>)/i',"/${1}_thumbs/Images//${3}",$str);

/*改變src屬性,
此處將原來(lái)的src="/upload/images/bbb.jpg"改變?yōu)閟rc="/upload/_thumbs/Images/bbb.jpg",并舍棄寬和高
(比如你想在前臺(tái)顯示縮略圖,但數(shù)據(jù)庫(kù)中存儲(chǔ)的是原圖的路徑。為什么要舍棄寬高??你縮略圖啊!還是原圖的寬高,會(huì)怎樣???)
*/
print preg_replace('/(<img).+(src=/"?.+)images//(.+/.(jpg|gif|bmp|bnp|png)/"?).+>/i',"/${1} /${2}_thumbs/Images//${3}>",$str);
?>