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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
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。
New Document </TITLE><br /> <META NAME="Generator" CONTENT="EditPlus"><br /> <META NAME="Author" CONTENT=""><br /> <META NAME="Keywords" CONTENT=""><br /> <META NAME="Description" CONTENT=""><br /> </HEAD><br /><br /> <BODY><br /> Xhtml Linux <br /> </BODY><br /> <script language="JavaScript"> <br /> document.body.innerHTML = document.body.innerHTML.replace(/(x)|(l)/gi,"<font color=red>$1$2</font>"); <br /></script><br /></HTML><br /><br />以下是通过FIREFOX 3.0 得到的BODY的innerHTM<br /> <font color="red">X</font>htm<font color="red">l</font> <font color="red">L</font>inu<font color="red">x</font> <br /> <script><font color=red>l</font>anguage="JavaScript"> <br /> document.body.innerHTM<font color=red>L</font> = document.body.innerHTM<font color=red>L</font>.rep<font color=red>l</font>ace(/(<font color=red>x</font>)|(<font color=red>l</font>)/gi,"<font co<font color=red>l</font>or=red>$1$2</......余下全文>><br/>
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