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    PHP正则表达式替换站点关键字链接后空白的解决方法,正则表达式关键字

    2016-06-13 09:25:24原创380

    PHP正则表达式替换站点关键字链接后空白的解决方法,正则表达式关键字


    标题这样不知道合适不合适。具体的情况是这样的:网站要增加关键字链接功能,然后需要对文章的内容进行正则表达式匹配并替换,然后使用了preg_replace函数。替换的程序代码如下:

    function ReplaceKeyword($linkDefs,$content){
    $linkMap = array();
    
    /*foreach($linkDefs as $row) {
    $linkMap[] = explode(',', $row);
    }*/
    $linkMap = $linkDefs;
    
    //把原有的链接替换成文字
    foreach($linkMap as $row) {
    $content = preg_replace('/(\s*)('.$row[0].')(\s*<\/a>)/sui', $row[0], $content);
    }
    
    //关键字从长至短排序
    usort($linkMap, '_sortDesc');
    //var_dump($linkMap);
    
    $tmpKwds = array(); //存放暂时被替换的子关键字
    
    $k_count=0;
    foreach($linkMap as $i=>$row) {
    list($kwd, $url) = $row;
    for($j=$i+1; $j'.$kwd.'', $content, $th_num ,$count); // 所有的匹配项都会被替换
    $k_count+=$count;
    }
    
    //把代替子关键字的字符串替换回来
    foreach($tmpKwds as $tmp=>$kwd) {
    $content = str_replace($tmp, $kwd, $content);
    }
    $result = array($content,$k_count);
    
    return $result;
    unset($result);
    unset($tmp);
    unset($tmpKwds);
    unset($kwd);
    unset($count);
    unset($config);
    unset($linkMap);
    unset($linkDefs);
    unset($tmpKwd);
    unset($content);
    unset($th_num);
    unset($row);
    unset($k_count);
    }

    程序是从网上找的,然后在本地测试是正常的,本地环境为php 5.3 服务是5.2的,上传到网上去后,提交则显示空白,一开始考虑是PHP版本问题,以为是ereg preg的区别,替换后还是不行。后来网上看,发现有网友说调整大pcre.backtrack_limit和pcre.recursion_limit就行,我试了下,果然可以了。看来是配置问题,不过一般情况下,PHP的默认配置应该没啥问题,我自己写的这程序还是不够好!


    php正则表达式问题,下面是一个,替换关键字为链接的程序

    我这样写都可以啊,用IE6,FIREFOX 3.0 都试过了,没问题。



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