After reading the example of how to secure your email on your website from robots with Javascript, I thought a pure PHP version would be nice.
The code below takes 1, 2 or 3 parameters, (1)the email and (2)the text for the link. If you omit the text, the email address is used. The 3rd parameter could be used to format the link.
Gerd Klingenspor wrote :1162
I forgot to mention, that you have to look into the source code to see the results.
Your visitors will see the unencoded version, the bots/harvesters will see the encoded version, but not the unencoded one.
matthew waygood wrote :1164
The results I got were :-
<a href="mailto:bob@hotmail.com" class=whatever>bob@hotmail.com</a><BR><a href="mailto:bob@hotmail.com" class=whatever>email me</a><BR><a href="mailto:bob@hotmail.com" >bob@hotmail.com</a>
You forgot to encrypt the link text if it too contains and email address, so bob@hotmail.com could still be extracted.
matthew waygood wrote :1165
forgot this was being displayed on a page, so doesnt reflect what I saw. I have replace the codes with # to make it more readable
matthew waygood wrote :1166
Although you can decode the email address, I have tried extracting with a few programs and it does seem to protect you email.
As the person who submitted the Javascript solution you refer to, I will be switching to this method as it provides better compatability with people who switch off javascript.
Nice work. I`ll add a comment to my own submission referencing this.
Sarah King wrote :1171
for comparison also see this code: http://www.weberdev.com/get_example.php3?count=3939
One type of encryption and also hides the mailto= string to prevent that giving the bots reason to store for manual processing (as they get smarter)
Sarah
Gerd Klingenspor wrote :1174
To make it pretty much bombproof:
matthew waygood wrote :1261
I needed this recently so I recoded it with some other features you may find useful. And included the coding of the MAILTO: text aswell as pointed out earlier.
<?php
function eMail($email, $name=``, $params=``, $email_extras=``)
{
// return an empty link if no email was specified
if( (!$email) || (!is_scalar($email)) ) return ``;
// contruct extra parameters for the mailto link, ie subject,cc,bcc,body while will also be encoded
$email_extras_string=``;
if($email_extras) $email_extras_string=`?`.$email_extras;
if(is_array($email_extras))
{
$email_extras_string=`?`;
$first=TRUE;
while(list($key,$value)=each($email_extras))
{
if(!$first)
{
$email_extras_string.="&";
}
$first=FALSE;
$email_extras_string.=$key."=".urlencode($value);
}
}
// if no name was specified then use the email address
if( (!$name) || (!is_scalar($name)) ) $name=$email;
// if formatting parameters were specified then add a space to make readable
$param_string=``;
if( ($params) && (is_scalar($params)) ) $param_string=` `.$params;
// return the link, encoding appropriate parts of the href
return `<A HREF="`.encString(`MAILTO:`.$email.$email_extras_string).`"`.$param_string.`>`.encString($name).`</A>`;
}
function encString($orgStr)
{
$encStr="";
$nowStr="";
$rndNum=-1;
$orgLen=strlen($orgStr);
for($i=0;$i<$orgLen;$i++)
{
if(version_compare("4.2", php_version)) // a pre php version 4.2, rand should be seeded
{
list($usec, $sec) = explode(` `, microtime());
srand( (float) $sec + ((float) $usec * 100000) );
}
$encMod = rand(1,5); // make chances of coding as follows: Decimal 2/5, Hex 2/5, None 1/5
switch($encMod)
{
case 1: // Decimal
case 2: // Decimal
$nowStr="&#".ord($orgStr[$i]).";";
break;
case 3: // Hexadecimal
case 4: // Hexadecimal
$nowStr="&#x".dechex(ord($orgStr[$i])).";";
break;
default: // Normal (case 5)
$nowStr=$orgStr[$i];
break;
}
$encStr.=$nowStr;
}
return $encStr;
}
