PHP替换文章内链的函数 php关键词替换(含屏蔽还原原始链接功能)

<?php
/*
* PHP替换文章内链
* by www.jb200.com
*/
function _base64_encode($t,$str) {
 return $t.""".base64_encode($str).""";
}
function _base64_decode($t,$str) {
 return $t.""".base64_decode($str).""";
}

function _keylinks($txt, $replacenum = '',$link_mode = 1) {
 /* 屏蔽原始的 a */
 $replace_a = "_base64_encode('ori_a=','')";
 $replace1_a = "stripslashes(base64_decode('1'))";
 $search_a = "/<a.*?>.*?</a>/isxe";
 $search1_a = "/ori_a=(".*?")/isxe";
 $txt = preg_replace($search_a, $replace_a, $txt);

 /* 屏蔽alt title src */
 $search = "/(alts*=s*|titles*=s*|srcs*=s*)   # find <a href=
      (["'])?(.*?)    # find single or double quote
      (?(2)2|s+?)  # if quote found, match up to next matching
             # quote, otherwise match up to next space
      /isxe";
 $replace = "_base64_encode('1','3')";
 $replace1 = "_base64_decode('1','3')";
 $txt = preg_replace($search, $replace, $txt);
 
 echo $txt;
 echo "<br>http://www.jb200.com/<br><br><br><br>";
 /*
 $keywords = $this->data['keywords'];
 if($keywords) $keywords = strpos(',',$keywords) === false ? explode(' ',$keywords) : explode(',',$keywords);
 if($link_mode && !empty($keywords)) {
  foreach($keywords as $keyword) {
   $linkdatas[] = $keyword;
  }
 } else {
  $linkdatas = getcache('keylink','commons');
 }
 if($linkdatas) {
  $word = $replacement = array();
  foreach($linkdatas as $v) {
   if($link_mode && $keywords) {
    $word1[] = '/'.preg_quote($v, '/').'/';
    $word2[] = $v;
    $replacement[] = '<a href="javascript:;" onclick="show_ajax(this)" class="keylink">'.$v.'</a>';
   } else {
    $word1[] = '/'.preg_quote($v[0], '/').'/';
    $word2[] = $v[0];
   
    $replacement[] = '<a href="'.$v[1].'" target="_blank" class="keylink">'.$v[0].'</a>';
   }
  }
  if($replacenum != '') {
   $txt = preg_replace($word1, $replacement, $txt, $replacenum);
  } else {
   $txt = str_replace($word2, $replacement, $txt);
  }
 }
 */
 
 /* 还原原始 a */
 $txt = preg_replace($search1_a, $replace1_a, $txt);
 /* 还原alt title src */
 $txt = preg_replace($search, $replace1, $txt);
 
 echo $txt;
 
 return $txt;
}

$con = "<P>　<STRONG>　性生活过度伤害前列腺。和谐<a href=asdf.htm >美满的性生</a>活，是男<a href='/dssd.aosdfj'>女生理的天</a>然需要，是夫妻感情的粘合剂之一，是夫妻<a href="wef.html">生活必不少的重</a>要组成部分。但是有此想法的夫妻可要注意了。因为做x爱时间并非越长越好，夫妻的性生活的和谐与美满也不由性xai时间的长短来决定。反而，超时性XZ爱，还会影响到夫妻的健康，甚至引发各种疾病。</STRONG></P>
<P align=center><IMG height=334 alt=性生活过度伤害前列腺 title="枯地枯要要要要极有人" title='sodksokdjfoisjdfj' src="/Files/前列腺/前列腺增生不手术的严重后果.jpg" width=341 border=0></P>";

_keylinks($con);
?>