Add space before every capital letter

I want to add a space between every capital letter.

So this:
           HelloWorldThisIsATest

Should become this:
           Hello World This Is A Test
LVL 16
hankknightAsked:
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Hube02Connect With a Mentor Commented:
Oops, I forgot a very important assignment. That's what I get for not testing first: See correction below.

As far as to use regular expressions or not, this is up to you. My opinion is that regular expressions are an important part of any programming/scripting language. They allow you to do in a single line what it takes several or many lines to do with simple string manipulation. Most languages worth mentioning use some form of the PERL standard, and usually there is something to tell you how they deviate form this, so learning them they become useful no matter what language your next project is in.


<?php
$string = 'HelloWorldThisIsATest';
$string = preg_replace('/([A-Z])(?<!^)/', ' $1', $string);
echo $string;
?>

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OpalelementConnect With a Mentor Commented:
Snippet:)
<?php
$string = "HelloWorldThisIsATest";
$chars = preg_split('//', $string, -1, PREG_SPLIT_NO_EMPTY);
foreach($chars as $char)
{
	if(ctype_upper($char))
	{
		$string = str_replace($char, " $char", $string);
	}
}
echo $string;
?>

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glenthorneConnect With a Mentor Commented:
This is an example from:  

http://us2.php.net/manual/en/function.preg-split.php

<?php

function spacify($camel, $glue = ' ') {
    return preg_replace( '/([a-z0-9])([A-Z])/', "$1$glue$2", $camel );
}

echo spacify('CamelCaseWords'), "\n"; // 'Camel Case Words'

?>

The key line if the "preg_replace" command.  The breakdown is as follows:

syntax: preg_replace( mixed $pattern  , mixed $replacement  , mixed $subject  );
In this case:
$pattern =  '/([a-z0-9])([A-Z])/'
$replacement = "$1$glue$2"
$subject = $camel

The trick here is the "pattern" (or regular expression) and the "replacement".  When you put a regular expression, in this case a character list (the list in square brackets []), inside parenthesis (), the "matching" string is stored in $1 ($1 is the for the first set of parenthesis, $2 is for the second set, etc).  So, this regular expression looks for any lower case letters and numbers and stores them in $1, then when it bumps into an upper case letter (stores in $2), the replacement inserts the "glue" (in this case a space) between the two, and the process repeats.
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Hube02Commented:
Why not just:

$string = 'HelloWorldThisIsATest';
preg_replace('/([A-Z])(?<!^)/', ' $1', $string);
echo $string;

Simply replaces every "cap" with "space cap", except the first character.

([A-Z]) = match any character from A to Z
(?<!^) = negative look behind = Not beginning of string
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OpalelementCommented:
Mine makes it so you don't need to understand regex, it is a simple solution that is easy to understand.
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OpalelementCommented:
I use regular expressions for matching strings but if it is something like this I just use the built in functions.
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hankknightAuthor Commented:
Thank you all! Regular expressions rock!
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Ravi KumarCommented:
Accepted solution not worked for me, here is my working solution

<?php

    $string = 'HelloWorldThisIsATest';

    $string = preg_replace('/((?<=[a-z])(?=[A-Z])|(?=[A-Z][a-z]))/', ' $1', $string);

    echo $string;
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