转：生成安全的电子邮件链接，防止邮件机器人抓取

请百分之百放心机器人不会来破解。

PHP代码

/**
 * Encoded Mailto Link
 *
 * Create a spam-protected mailto link written in Javascript
 *
 * @access  public
 * @param   string  the email address
 * @param   string  the link title
 * @param   mixed   any attributes
 * @return  string
 */
if ( ! function_exists('safe_mailto'))
{
    function safe_mailto($email, $title = '', $attributes = '')
    {
        $title = (string) $title;

        if ($title == "")
        {
            $title = $email;
        }

        for ($i = 0; $i < 16; $i++)
        {
            $x[] = substr('<a href="mailto:', $i, 1);
        }

        for ($i = 0; $i < strlen($email); $i++)
        {
            $x[] = "|".ord(substr($email, $i, 1));
        }

        $x[] = '"';

        if ($attributes != '')
        {
            if (is_array($attributes))
            {
                foreach ($attributes as $key => $val)
                {
                    $x[] =  ' '.$key.'="';
                    for ($i = 0; $i < strlen($val); $i++)
                    {
                        $x[] = "|".ord(substr($val, $i, 1));
                    }
                    $x[] = '"';
                }
            }
            else
            {
                for ($i = 0; $i < strlen($attributes); $i++)
                {
                    $x[] = substr($attributes, $i, 1);
                }
            }
        }

        $x[] = '>';

        $temp = array();
        for ($i = 0; $i < strlen($title); $i++)
        {
            $ordinal = ord($title[$i]);

            if ($ordinal < 128)
            {
                $x[] = "|".$ordinal;
            }
            else
            {
                if (count($temp) == 0)
                {
                    $count = ($ordinal < 224) ? 2 : 3;
                }

                $temp[] = $ordinal;
                if (count($temp) == $count)
                {
                    $number = ($count == 3) ? (($temp['0'] % 16) * 4096) + (($temp['1'] % 64) * 64) + ($temp['2'] % 64) : (($temp['0'] % 32) * 64) + ($temp['1'] % 64);
                    $x[] = "|".$number;
                    $count = 1;
                    $temp = array();
                }
            }
        }

        $x[] = '<'; $x[] = '/'; $x[] = 'a'; $x[] = '>';

        $x = array_reverse($x);
        ob_start();

    ?><script type="text/javascript">
    //<![CDATA[
    var l=new Array();
    <?php
    $i = 0;
    foreach ($x as $val){ ?>l[<?php echo $i++; ?>]='<?php echo $val; ?>';<?php } ?>

    for (var i = l.length-1; i >= 0; i=i-1){
    if (l[i].substring(0, 1) == '|') document.write("&#"+unescape(l[i].substring(1))+";");
    else document.write(unescape(l[i]));}
    //]]>
    </script><?php

        $buffer = ob_get_contents();
        ob_end_clean();
        return $buffer;
    }
}

使用：

PHP代码

<?php
echo safe_mailto('yourname@yourdomain.com');

会生成类似这样一段代码：

JavaScript代码

<script type="text/javascript">
    //<![CDATA[
    var l=new Array();
    l[0]='>';l[1]='a';l[2]='/';l[3]='<';l[4]='|109';l[5]='|111';l[6]='|99';l[7]='|46';l[8]='|105';l[9]='|119';l[10]='|110';l[11]='|111';l[12]='|105';l[13]='|115';l[14]='|64';l[15]='|101';l[16]='|99';l[17]='|105';l[18]='|118';l[19]='|114';l[20]='|101';l[21]='|115';l[22]='>';l[23]='"';l[24]='|109';l[25]='|111';l[26]='|99';l[27]='|46';l[28]='|105';l[29]='|119';l[30]='|110';l[31]='|111';l[32]='|105';l[33]='|115';l[34]='|64';l[35]='|101';l[36]='|99';l[37]='|105';l[38]='|118';l[39]='|114';l[40]='|101';l[41]='|115';l[42]=':';l[43]='o';l[44]='t';l[45]='l';l[46]='i';l[47]='a';l[48]='m';l[49]='"';l[50]='=';l[51]='f';l[52]='e';l[53]='r';l[54]='h';l[55]=' ';l[56]='a';l[57]='<';
    for (var i = l.length-1; i >= 0; i=i-1){
    if (l[i].substring(0, 1) == '|') document.write("&#"+unescape(l[i].substring(1))+";");
    else document.write(unescape(l[i]));}
    //]]>
    </script>

显示效果如下：service@sionwi.com

转自：http://blog.icain.cn/show-197-1.html