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How to convert URLs in text into links in PHP

一个新手
一个新手Original
2017-09-12 10:18:192788browse

其实我在《把文本中的URL地址转换为可点击链接的JavaScript、PHP自定义函数》一文中介绍过PHP代码如何实现将URL地址转化成链接的方法,今天给大家介绍一个更加简洁的版本,先来看看PHP的源代码:

/**
* Author: SeeDZ
* From: http://code.seebz.net/p/autolink-php/
**/
function autolink($str, $attributes = array()) {
$attrs = '';
foreach ($attributes as $attribute=>$value) {
$attrs .= " {$attribute}=\"{$value}\"";
}
 $str = ' '.$str;
$str = preg_replace(&#39;`([^"=\&#39;>])((http|https|ftp|ftps)://[^\s< ]+[^\s<\.)])`i&#39;, &#39;$1<a href="$2" rel="external nofollow" &#39;.$attrs.&#39;>$2</a>&#39;, $str);
$str = substr($str, 1);
 return $str;
}

 怎么样,很简洁吧!看看函数的API文档吧:

语法

string autolink ( string $str [, array $attributes = array() ] )

参数介绍

str – 必选(String 类型数据)。需要查询替换的文本。
attributes -可选(Array 类型数据)。替换链接的一些可选参数。

返回值

返回替换后的文本。

autolink() 调用方法

autolink使用起来也很方便,我们可以只传一个参数,即为必选的需要替换的字符文本。例如:

<?php
 $str = &#39;A link : http://example.com/?param=value#anchor.&#39;;
$str = autolink($str);
echo $str; // A link : <a href="http://example.com/?param=value#anchor" rel="external nofollow" >http://example.com/?param=value#anchor</a>.
?>

 另外我们还可以设置一些额外的链接的参数,可以让生成的链接在新窗口中打开,或者不希望搜索引擎索引替换的链接。例如:

 <?php
 $str = &#39;http://example.com/&#39;;
$str = autolink($str, array("target"=>"_blank","rel"=>"nofollow"));
 echo $str; // <a href="http://example.com/" rel="external nofollow" target="_blank" >http://example.com/</a>
 ?>

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