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PHP正则表达式替换站点关键字链接后空白的问题解决,正则表达式关键字_PHP教程

时间:2021-07-01 10:21:17 帮助过:4人阅读

PHP正则表达式替换站点关键字链接后空白的问题解决,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) { $content = str_replace($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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