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How does WordPress convert external links to internal links?The external link of the article is automatically converted into the internal link code

WordPressHow to convert external links to internal links?

The external link of the article is automatically converted into the internal link code

Sometimes we do GoogleSEORanking, sharing some overseas websites or forums that are blocked by the Chinese network on the WordPress website, such links are at risk of being blocked.

Therefore, we need to automatically convert some external links in the article into internal links.

The advantage of converting external links into internal links

  • Security hardening: Enhance simple protection against malicious requests;
  • Jump mode: use the noscript tag to increase the html js jump mode;
  • Jump encryption: Base64 encrypted external chain, compatible with non-encrypted jump;
  • Forbidden to include: Added a META statement prohibiting search engine spiders from including and capturing;
  • Prohibited Use: Prohibit other sites from using our redirect pages.

Step 1: Upload the file to the website root directory

There are 2 versions of the code that automatically converts the external links of WordPress articles into internal links:

  1. PHP version
  2. JS version

PHP version

Save the following PHP code as go.php and upload it to the website root directory.

<?
php
if(strlen($_SERVER['REQUEST_URI']) > 255 ||
 strpos($_SERVER['REQUEST_URI'], "eval(") ||
 strpos($_SERVER['REQUEST_URI'], "base64")) {
 @header("HTTP/1.1 414 Request-URI Too Long");
 @header("Status: 414 Request-URI Too Long");
 @header("Connection: Close");
 @exit;
}
//通过QUERY_STRING取得完整的传入数据，然后取得url=之后的所有值，兼容性更好
$t_url = preg_replace('/^url=(.*)$/i','$1',$_SERVER["QUERY_STRING"]);
//此处可以自定义一些特别的外链，不需要可以删除以下5行
if($t_url=="chenweiliang" ) {
 $t_url="https://www.chenweiliang.com/";
} elseif($t_url=="etufo") {
 $t_url="https://www.etufo.org/";
}
//数据处理
if(!empty($t_url)) {
 //判断取值是否加密
 if ($t_url == base64_encode(base64_decode($t_url))) {
 $t_url = base64_decode($t_url);
 }
 //对取值进行网址校验和判断
 preg_match('/^(http|https|thunder|qqdl|ed2k|Flashget|qbrowser):\/\//i',$t_url,$matches);
 if($matches){
 $url=$t_url;
 $title='页面加载中,请稍候...';
 } else {
 preg_match('/\./i',$t_url,$matche);
 if($matche){
 $url='http://'.$t_url;
 $title='页面加载中,请稍候...';
 } else {
 $url = 'http://'.$_SERVER['HTTP_HOST'];
 $title='参数错误，正在返回首页...';
 }
 }
} else {
 $title = '参数缺失，正在返回首页...';
 $url = 'http://'.$_SERVER['HTTP_HOST'];
}
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="robots" content="noindex, nofollow" />
<noscript><meta http-equiv="refresh" content="1;url='<?php echo $url;?>';"></noscript>
<script>
function link_jump()
{
 //禁止其他网站使用我们的跳转页面
 var MyHOST = new RegExp("<?php echo $_SERVER['HTTP_HOST']; ?>");
 if (!MyHOST.test(document.referrer)) {
 location.href="http://" + MyHOST;
 }
 location.href="<?php echo $url;?>";
}
//延时1S跳转，可自行修改延时时间
setTimeout(link_jump, 1000);
//延时50S关闭跳转页面，用于文件下载后不会关闭跳转页的问题
setTimeout(function(){window.opener=null;window.close();}, 50000);
</script>
<title><?php echo $title;?></title>
<style type="text/css">
body{background:#555}.loading{-webkit-animation:fadein 2s;-moz-animation:fadein 2s;-o-animation:fadein 2s;animation:fadein 2s}@-moz-keyframes fadein{from{opacity:0}to{opacity:1}}@-webkit-keyframes fadein{from{opacity:0}to{opacity:1}}@-o-keyframes fadein{from{opacity:0}to{opacity:1}}@keyframes fadein{from{opacity:0}to{opacity:1}}.spinner-wrapper{position:absolute;top:0;left:0;z-index:300;height:100%;min-width:100%;min-height:100%;background:rgba(255,255,255,0.93)}.spinner-text{position:absolute;top:45%;left:50%;margin-left:-100px;margin-top:2px;color:#000;letter-spacing:1px;font-size:20px;font-family:Arial}.spinner{position:absolute;top:45%;left:50%;display:block;margin-left:-160px;width:1px;height:1px;border:20px solid rgba(255,0,0,1);-webkit-border-radius:50px;-moz-border-radius:50px;border-radius:50px;border-left-color:transparent;border-right-color:transparent;-webkit-animation:spin 1.5s infinite;-moz-animation:spin 1.5s infinite;animation:spin 1.5s infinite}@-webkit-keyframes spin{0%,100%{-webkit-transform:rotate(0deg) scale(1)}50%{-webkit-transform:rotate(720deg) scale(0.6)}}@-moz-keyframes spin{0%,100%{-moz-transform:rotate(0deg) scale(1)}50%{-moz-transform:rotate(720deg) scale(0.6)}}@-o-keyframes spin{0%,100%{-o-transform:rotate(0deg) scale(1)}50%{-o-transform:rotate(720deg) scale(0.6)}}@keyframes spin{0%,100%{transform:rotate(0deg) scale(1)}50%{transform:rotate(720deg) scale(0.6)}}
</style>
</head>
<body>
<div class="loading">
 <div class="spinner-wrapper">
 <span class="spinner-text">页面加载中，请稍候...</span>
 <span class="spinner"></span>
 </div>
</div>
</body>
</html>

JS version

Save the following JS code as go.html and upload it to the website root directory.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="robots" content="noindex, nofollow" />
<script>
//base64加密解密函数
var base64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var base64DecodeChars=new Array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1);function base64encode(str){var out,i,len;var c1,c2,c3;len=str.length;i=0;out="";while(i<len){c1=str.charCodeAt(i++)&255;if(i==len){out+=base64EncodeChars.charAt(c1>>2);out+=base64EncodeChars.charAt((c1&3)<<4);out+="==";break}c2=str.charCodeAt(i++);if(i==len){out+=base64EncodeChars.charAt(c1>>2);out+=base64EncodeChars.charAt(((c1&3)<<4)|((c2&240)>>4));out+=base64EncodeChars.charAt((c2&15)<<2);out+="=";break}c3=str.charCodeAt(i++);out+=base64EncodeChars.charAt(c1>>2);out+=base64EncodeChars.charAt(((c1&3)<<4)|((c2&240)>>4));out+=base64EncodeChars.charAt(((c2&15)<<2)|((c3&192)>>6));out+=base64EncodeChars.charAt(c3&63)}return out}function base64decode(str){var c1,c2,c3,c4;var i,len,out;len=str.length;i=0;out="";while(i<len){do{c1=base64DecodeChars[str.charCodeAt(i++)&255]}while(i<len&&c1==-1);if(c1==-1){break}do{c2=base64DecodeChars[str.charCodeAt(i++)&255]}while(i<len&&c2==-1);if(c2==-1){break}out+=String.fromCharCode((c1<<2)|((c2&48)>>4));do{c3=str.charCodeAt(i++)&255;if(c3==61){return out}c3=base64DecodeChars[c3]}while(i<len&&c3==-1);if(c3==-1){break}out+=String.fromCharCode(((c2&15)<<4)|((c3&60)>>2));do{c4=str.charCodeAt(i++)&255;if(c4==61){return out}c4=base64DecodeChars[c4]}while(i<len&&c4==-1);if(c4==-1){break}out+=String.fromCharCode(((c3&3)<<6)|c4)}return out}function utf16to8(str){var out,i,len,c;out="";len=str.length;for(i=0;i<len;i++){c=str.charCodeAt(i);if((c>=1)&&(c<=127)){out+=str.charAt(i)}else{if(c>2047){out+=String.fromCharCode(224|((c>>12)&15));out+=String.fromCharCode(128|((c>>6)&63));out+=String.fromCharCode(128|((c>>0)&63))}else{out+=String.fromCharCode(192|((c>>6)&31));out+=String.fromCharCode(128|((c>>0)&63))}}}return out}function utf8to16(str){var out,i,len,c;var char2,char3;out="";len=str.length;i=0;while(i<len){c=str.charCodeAt(i++);switch(c>>4){case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:out+=str.charAt(i-1);break;case 12:case 13:char2=str.charCodeAt(i++);out+=String.fromCharCode(((c&31)<<6)|(char2&63));break;case 14:char2=str.charCodeAt(i++);char3=str.charCodeAt(i++);out+=String.fromCharCode(((c&15)<<12)|((char2&63)<<6)|((char3&63)<<0));break}}return out}function doit(){var f=document.f;f.output.value=base64encode(utf16to8(f.source.value));f.decode.value=utf8to16(base64decode(f.output.value))};
//获取请求参数,支持伪静态
function GetQueryString(name)
{
 var reg = new RegExp("(^|&)"+ name +"=(.*)$");
 var r = window.location.search.substr(1).match(reg);
 if(r!=null) {
 return unescape(r[2]);
 } else {
 return window.location.pathname.replace('/go/',''); //注意代码中的/goto/和跳转地址/goto/保持一致，请记得自行修改！
 }
}
var jump_url = GetQueryString("url");
//若传入的是base加密数据，则进行解密处理
if( jump_url==base64encode(base64decode(jump_url))) {
 jump_url = base64decode(jump_url);
}
//url简单正则
var UrlReg = "^((http|https|thunder|qqdl|ed2k|Flashget|qbrowser|ftp|rtsp|mms)://)";
//自定义一些跳转字符串，请根据实际需求自行发挥
if(jump_url=="chenweiliang") {
 var jump_url="https://www.chenweiliang.com/";
}
if(jump_url=="etufo") {
 var jump_url="https://www.etufo.org/";
}
//网址校验
if(jump_url == null || jump_url.toString().length<1 || !jump_url.match(UrlReg)) {
 document.title = '参数错误，正在返回首页...';
 jump_url = location.origin;
}
//延时执行跳转
setTimeout(
function link_jump()
{
//非本站域名不允许使用此跳转页面，请自行修改chenweiliang.com为自己的域名
 var MyHOST = new RegExp("chenweiliang.com");
 if (!MyHOST.test(document.referrer)) {
 location.href = "http://" + MyHOST;
 return;
 }
 location.href = jump_url;
}, 1000);
setTimeout(function(){window.opener=null;window.close();}, 50000);
</script>
<title>页面加载中，请稍候...</title>
<style type="text/css">
body{background:#555}.loading{-webkit-animation:fadein 2s;-moz-animation:fadein 2s;-o-animation:fadein 2s;animation:fadein 2s}@-moz-keyframes fadein{from{opacity:0}to{opacity:1}}@-webkit-keyframes fadein{from{opacity:0}to{opacity:1}}@-o-keyframes fadein{from{opacity:0}to{opacity:1}}@keyframes fadein{from{opacity:0}to{opacity:1}}.spinner-wrapper{position:absolute;top:0;left:0;z-index:300;height:100%;min-width:100%;min-height:100%;background:rgba(255,255,255,0.93)}.spinner-text{position:absolute;top:45%;left:50%;margin-left:-100px;margin-top:2px;color:#000;letter-spacing:1px;font-size:20px;font-family:Arial}.spinner{position:absolute;top:45%;left:50%;display:block;margin-left:-160px;width:1px;height:1px;border:20px solid rgba(255,0,0,1);-webkit-border-radius:50px;-moz-border-radius:50px;border-radius:50px;border-left-color:transparent;border-right-color:transparent;-webkit-animation:spin 1.5s infinite;-moz-animation:spin 1.5s infinite;animation:spin 1.5s infinite}@-webkit-keyframes spin{0%,100%{-webkit-transform:rotate(0deg) scale(1)}50%{-webkit-transform:rotate(720deg) scale(0.6)}}@-moz-keyframes spin{0%,100%{-moz-transform:rotate(0deg) scale(1)}50%{-moz-transform:rotate(720deg) scale(0.6)}}@-o-keyframes spin{0%,100%{-o-transform:rotate(0deg) scale(1)}50%{-o-transform:rotate(720deg) scale(0.6)}}@keyframes spin{0%,100%{transform:rotate(0deg) scale(1)}50%{transform:rotate(720deg) scale(0.6)}}
</style>
</head>
<body>
<div class="loading">
 <div class="spinner-wrapper">
 <span class="spinner-text">页面加载中，请稍候...</span>
 <span class="spinner"></span>
 </div>
</div>
</body>
</html>

Please note the modification://This jump page is not allowed to be used for domain names other than this site, please modify chenweiliang.com to your own domain name

Which is better, PHP or JS?

The functions of the PHP version and the JS version are the same, the difference is:

  • PHP version is dynamic and slightly server load is generated;
  • And the JS version requires the browser to support JS to work properly,
  • But now, most browsers support it!

Note: If the jump code of the test JS version is invalid, use the jump code of PHP.

Step 2: Add code to function.php file

After uploading the jump page, the next step is to add the external link jump code to the function.php file of the WordPress theme.

2-to-1 code:

  • 1) External link jump without encryption
  • 2) External link jump base64 encryption [recommended]

External link jump without encryption

// 外链跳转无加密go.html?url
add_filter('the_content','link_to_jump',999);
 function link_to_jump($content){
 preg_match_all('/<a(.*?)href="(.*?)"(.*?)>/',$content,$matches);
 if($matches){
 foreach($matches[2] as $val){
 if(strpos($val,'://')!==false && strpos($val,home_url())===false && strpos($val,'chenweiliang.com')===false && strpos($val,'ufo.org.in')===false && strpos($val,'etufo.org')===false && !preg_match('/\.(jpg|jepg|png|ico|bmp|gif|tiff)/i',$val) && !preg_match('/(ed2k|thunder|Flashget|flashget|qqdl):\/\//i',$val))
{ 
 $content=str_replace("href=\"$val\"", "rel=\"nofollow\" target=\"_blank\" href=\"go.html?url=$val\" ",$content);

}
 }
 }
 return $content;
 }

External link jump base64 encryption [recommended]

// 外链跳转base64加密go.html?url
 add_filter('the_content','link_to_jump',999);
 function link_to_jump($content){
 preg_match_all('/<a(.*?)href="(.*?)"(.*?)>/',$content,$matches);
 if($matches){
 foreach($matches[2] as $val){
 if(strpos($val,'://')!==false && strpos($val,home_url())===false && strpos($val,'chenweiliang.com')===false && strpos($val,'ufo.org.in')===false && strpos($val,'etufo.org')===false && !preg_match('/\.(jpg|jepg|png|ico|bmp|gif|tiff)/i',$val) && !preg_match('/(ed2k|thunder|Flashget|flashget|qqdl):\/\//i',$val))
{ 
 $content=str_replace("href=\"$val\"", "rel=\"nofollow\" target=\"_blank\" href=\"go.html?url=" .base64_encode($val). "\" ",$content);

}
 }
 }
 return $content;
 }

Excludes specifying an external link domain name from not automatically converting to an internal link (domain namewhitelist):

&& strpos($val,'你的域名')===false

robots.txt blocks spiders

In order to prevent search engine spiders from crawling the jump links, we can add rules to prohibit search engine spiders from crawling in the robots.txt file:

User-agent: *
Disallow: /go.html?url=*
Disallow: /go.php?url=*

This article is not over, please continue to read "Extended Reading"

Extended reading:

Hope Chen Weiliang Blog ( https://www.chenweiliang.com/ ) shared "How does WordPress convert external links to internal links?The article's external link is automatically converted into an internal link code", which is helpful to you.

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