一段代码执行有关问题 -PHP-Tutorial-php.cn

一段代码执行有关问题

WBOY

Freigeben： 2016-06-13 13:29:08

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一段代码执行问题

PHP code

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<?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 = $rows['page_text'];
//部分page_text    
//<img src="../Documents/medies/ESIL_zhaoqifadianrelianghuishou.gif" alt="Image:ESIL_zhaoqifadianrelianghuishou.gif"    style="max-width:90%"  style="max-width:90%" longdesc="/index.php/Image:ESIL_zhaoqifadianrelianghuishou.gif" />    
//<img src="../Documents/medies/ESIL_gaowenjiayarechuliliucheng1.gif" alt="Image:ESIL_gaowenjiayarechuliliucheng1.gif"    style="max-width:90%"  style="max-width:90%" longdesc="/index.php/Image:ESIL_gaowenjiayarechuliliucheng1.gif">        
    preg_match_all('#width="(\d+)"\s*height="(\d+)"#i',$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());
}
?>

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结果是2句都执行了

HTML code

<!--

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-->//部分page_text    
//<img src="../Documents/medies/ESIL_zhaoqifadianrelianghuishou.gif" alt="Image:ESIL_zhaoqifadianrelianghuishou.gif"    style="max-width:90%"  style="max-width:90%" longdesc="/index.php/Image:ESIL_zhaoqifadianrelianghuishou.gif">    
//<img src="../Documents/medies/ESIL_gaowenjiayarechuliliucheng1.gif" alt="Image:ESIL_gaowenjiayarechuliliucheng1.gif"    style="max-width:90%"  style="max-width:90%" longdesc="/index.php/Image:ESIL_gaowenjiayarechuliliucheng1.gif">

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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。

------解决方案--------------------
$m[1] 返回的是所有匹配的内容.

print_r 看看你就知道了
------解决方案--------------------
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。
------解决方案--------------------
记得我给你写贴过代码

PHP code

$page_text =    
<img src="../Documents/medies/ESIL_gaowenjiayarechuliliucheng1.gif" alt="Image:ESIL_gaowenjiayarechuliliucheng1.gif"    style="max-width:90%"  style="max-width:90%" 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];
} <div class="clear">
                 
              
              
        
            </div>

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