PHP链接锚文本转换为超链接

原创: 2016-06-07 11:35:431144浏览

有些人可能不明白标题意思，简单通俗的讲就是把字符串里的网址转为超链接显示。我们用PHP写了个函数，只要传参变量文本，即可自动转换。

字符串锚文本转换为可点击的链接函数：

function urlToLink($str) { 

    $arr = array("www." => "http://www."); 

    $str = strtr($str, $arr); 

    $arr = array("http://http://" => "http://"); 

    $str = strtr($str, $arr); 

    $str2 = explode("http://", $str); 

    for ($n = 1; isset($str2[$n]); $n ++) { 

        $str3 = explode(".", $str2[$n]); 

        if (isset($str3[1])) { 

            $str4 = explode("www.", $str2[$n]); 

            if ((isset($str4[1]) && isset($str3[2])) || !isset($str4[1])) { 

                $length = strlen($str2[$n]); 

                for ($i = 0; $i <= $length; $i ++) { 

                    //从空格断开 

                    if (($i - 1) == strlen(trim(mb_substr($str2[$n], 0, $i, 'gb2312')))) { 

                        $ii = $i - 1; 

                        $url1 = mb_substr($str2[$n], 0, $ii, 'gb2312'); 

                        $url2 = mb_substr($str2[$n], $ii, $length, 'gb2312'); 

                        $url3 = "http://" . $url1 . "" . $url2; 

                        break; 

                    } 

 

                    //从出现汉字处断开 

                    if ($i != strlen(mb_substr($str2[$n], 0, $i, 'gb2312'))) { 

                        $ii = $i - 1; 

                        $url1 = mb_substr($str2[$n], 0, $ii, 'gb2312'); 

                        $url2 = mb_substr($str2[$n], $ii, $length, 'gb2312'); 

                        $url3 = "http://" . $url1 . "" . $url2; 

                        break; 

                    } 

                    if ($i == $length) 

                        $url3 = "http://" . $str2[$n] . ""; 

                } 

            } else 

                $url3 = "http://" . $str2[$n]; 

        } else 

            $url3 = "http://" . $str2[$n]; 

        $url .= $url3; 

    } 

    if (substr($str, 0, 7) == "http://") 

        $url = "" . $str2[0] . "" . $url; 

    else 

        $url = $str2[0] . $url; 

    return $url; 

}