一段代码执行问题
- PHP code
<?php $DBserver = "localhost";$DBname = "new";$DBuser = "root";$DBpassword = "";$con = mysql_connect("localhost","root","");mysql_query("set names 'gbk'");mysql_select_db("new");$query = mysql_query("select page_id,page_text from pagecontents where page_id = 101370") or die(mysql_error() );while($rows = mysql_fetch_array($query)){ $pid = $rows['page_id']; $ptext = $rows['page_text'];//部分page_text //<img src="../Documents/medies/ESIL_zhaoqifadianrelianghuishou.gif" alt="Image:ESIL_zhaoqifadianrelianghuishou.gif" width="850" height="600" longdesc="/index.php/Image:ESIL_zhaoqifadianrelianghuishou.gif" /> //<img src="../Documents/medies/ESIL_gaowenjiayarechuliliucheng1.gif" alt="Image:ESIL_gaowenjiayarechuliliucheng1.gif" width="550" height="400" longdesc="/index.php/Image:ESIL_gaowenjiayarechuliliucheng1.gif" /> preg_match_all('#width="(\d+)"\s*height="(\d+)"#i',$ptext,$m); if($m[1]>805){ $h=($m[2]*805)/$m[1] ; $k=805; $ptext = preg_replace('/(width=)"(\d+)"(\s*height=)"(\d+)"/i','$1"'.$k.'"$3"'.$h.'"',$m); } mysql_query("set names 'gbk'"); $sql = "update pagecontents set page_text = ('{$ptext}') where page_id = ('{$pid}')"; mysql_query($sql) or die(mysql_error());}?>结果是2句都执行了
- HTML code
//部分page_text //<img src="../Documents/medies/ESIL_zhaoqifadianrelianghuishou.gif" alt="Image:ESIL_zhaoqifadianrelianghuishou.gif" width="805" height="568" longdesc="/index.php/Image:ESIL_zhaoqifadianrelianghuishou.gif" /> //<img src="../Documents/medies/ESIL_gaowenjiayarechuliliucheng1.gif" alt="Image:ESIL_gaowenjiayarechuliliucheng1.gif" width="805" height="568" longdesc="/index.php/Image:ESIL_gaowenjiayarechuliliucheng1.gif" />
本来想做的是只改width超过805的那条，也就是第一条，结果所有的都被替换了。
[解决办法]
$m[1] 返回的是所有匹配的内容.
print_r 看看你就知道了
[解决办法]
问题还没解决呢？ 你贴了几段。到底以那段为标准。问题也没描述清楚。
[解决办法]
记得我给你写贴过代码
- PHP code
$page_text =<<< TXT<img src="../Documents/medies/ESIL_zhaoqifadianrelianghuishou.gif" alt="Image:ESIL_zhaoqifadianrelianghuishou.gif" width="850" height="600" longdesc="/index.php/Image:ESIL_zhaoqifadianrelianghuishou.gif" /> <img src="../Documents/medies/ESIL_gaowenjiayarechuliliucheng1.gif" alt="Image:ESIL_gaowenjiayarechuliliucheng1.gif" width="550" height="400" longdesc="/index.php/Image:ESIL_gaowenjiayarechuliliucheng1.gif" /> TXT;echo preg_replace_callback('#width="(\d+)"\s*height="(\d+)"#i', 'back', $page_text );//$m[1]是width的值 , $m[2]是height的值。function back($m) { if($m[1]>805){ $h=round(($m[2]*805)/$m[1]); $k=805; return "width=\"$k\" height=\"$h\" "; } return $m[0];}