Insert Character into String?

I have a $string and want to loop through inserting characters inbetween the letters. What's the best function to do this in php?

I apologise if I'm being a muppet.

 

There's loads of ways to do this; keeping it simple, something like the following;

$string = "This is my string";
$newstring = "";

for($x=0; $x<strlen($string);$x++)
  {
  $newstring .= $string[$x];
  if($x != strlen($string)-1)
    $newstring .= "CHAR TO INSERT";
  }

PHP:

If you have more specific requirements, let me know

 

You could also do something like:

$string = preg_replace("/([a-z])\B/i", "\$1$insert", $string);

PHP:

You can run this function here:
http://www.exorithm.com/algorithm/view/insert_into_words

 

function stringrpl($x,$r,$str)
{
$out = "";
$temp = substr($str,$x);
$out = substr_replace($str,"$r",$x);
$out .= $temp;
return $out;
}

$test = stringrpl(2,"c",$test);
echo $test;