How Can I Make WordPress's <?php the_title_attribute(); ?> Render %20 for Spaces?

I'm trying to render a WordPress theme that is 100% HTML5 compliant, and have managed my way through all but one snag.

At the end of certain posts I show a "Tweet" link, which uses the following source code in the Theme template:

<a href="http://twitter.com/share?text=<?php the_title_attribute(); ?>&amp;via=ianhines&amp;url=<?php echo simple_url_shortener('','service=bit.ly+key&apikey=R_a6dc414291bb882024ddd99690f5eb61&login=ianhines&cache=no'); ?>" title="Share This Article on Twitter">Tweet</a>

HTML5 forbids having spaces in URLs. They must be rendered as %20. However, <?php the_title_attribute; ?> renders an XHTML safe version of the Post Title with spaces maintained.

An example URL (rendered using the template source code above):

a href="http://twitter.com/share?text=Twitter, Reblog, and Email Comments&via=ianhines&url=http://ihin.es/eCoYN9" title="Share This Article on Twitter">Tweet</a>

Is there any w开发者_StackOverflow社区ay I can force WordPress to render the spaces in this URL string as %20, and thereby make my site fully HTML5 compliant?

Well, just wrap the the_title_attribute() with urlencode():

/share?text=<?php echo urlencode(the_title_attribute()); ?>&amp;via=

Edit: Ok, due to that comment, you'd need to do something like this:

<?php
ob_start();
the_title_attribute();
$title = ob_get_clean();
?>
/share?text=<?php echo urlencode($title); ?>&amp;via=

Edit2: Looking at the docs for the_title_attribute:

/share?text=<?php echo urlencode(the_title_attribute('echo=0')); ?>&amp;via=

A value of 0 passed to the_title_attribute() makes it return rather than echo it's result.

<?php 
  $urltitle= str_replace(' ','%20',the_title_attribute('echo=0')); //value of 0 to return rather than echo result  
?> 

<a href="http://twitter.com/share?text=<?php echo $urltitle; ?>&amp;via=ianhines&amp;url=<?php echo simple_url_shortener('','service=bit.ly+key&apikey=R_a6dc414291bb882024ddd99690f5eb61&login=ianhines&cache=no'); ?>" title="Share This Article on Twitter">Tweet</a>

<?php
    $spaceurl=the_title_attribute('echo=0');
    $nonspaceurl=preg_replace('\s','%20',spaceurl);
?>

<a href="<?php echo $nonspaceurl; ?>">
    my link text
</a>

EDIT

I added echo=0 to return the text instead of displaying it, see the_title_attribute.

My suggestion would be to use the echo param of the_title_attribute() and urlencode() the spaces:

<a href="http://twitter.com/share?text=<?php echo urlencode(the_title_attribute('', '', 0)); ?>&amp;via=ianhines&amp;url=<?php echo simple_url_shortener('','service=bit.ly+key&apikey=R_a6dc414291bb882024ddd99690f5eb61&login=ianhines&cache=no'); ?>" title="Share This Article on Twitter">Tweet</a>