I guess this is more of a hack than anything, but I really needed eval()'s code NOT to be displayed right away. So I used ob_start(), ob_get_contents(), and ob_end_clean(). 

<?php 

$stuff = "Hello, "; 

ob_start(); // start buffer 
eval("print 'World!';"); // execute code 
$retval = ob_get_contents(); // return executed code 
ob_end_clean(); // delete the buffer 

print $stuff.$retval; 

?> 

This would print "Hello, World!" instead of "World!Hello, ".

Is there a function to do this already?

Thanks,
Chris