Encode a string into character codes - php

Question

I want to encode an email address into its corresponding character codes, so when it is printed the char codes are interpreted by the browser, but the robots get the encoded string instead of the interpreted one.
For example (1):
abc#abc.com
should be sent to the browser as (2) (whitespaces added so the browser shows it):
&#97 ;&#98 ;&#99 ;&#64 ;&#97 ;&#98 ;&#99 ;&#46 ;&#99 ;&#111 ;&#109 ;
so the human reads (1) and web robots read(2)
There should be an easy function or way to do this, but cannot find one.

Answer 1

YOu could try this:
<?php
$s = "abc#abc.com";
$obj = array_map(function($x){return "&#". strval(ord($x)) . ";";},str_split($s));
echo implode($obj);
?>

Answer 2

function encode_everything($string){
$encoded = "";
for ($n=0;$n<strlen($string);$n++){
$check = htmlentities($string[$n],ENT_QUOTES);
$string[$n] == $check ? $encoded .= "&#".ord($string[$n]).";" : $encoded .= $check;
}
return $encoded;
}
Found at:
http://php.net/manual/en/function.htmlentities.php

Answer 3

Here's a neat function I wrote to do something similar - not sure if it's exactly what you're looking for, but it uses php's ord function to take each character in a string and output its ascii equivalent:
$testString = "I hate – Character – 150" ;
function printAscii($string){
for ($n=0;$n<strlen($string);$n++){
echo "<pre>";
echo ord($string[$n]);
echo " ---->";
echo $string[$n];
echo "</pre>";
}
}
$test = printAscii($testString);