So, it's pretty cool that you can use positional arguments with sprintf.
$retval = sprintf('%2$s is %1$s', 'awesome', 'Evan');
It's important to remember, though, that /inside double quotes/ that $s
will be treated as a /variable,/ which will be (usually) unset, which
will result in something like '%2 is %1'. sprintf() will ignore the
escape codes, resulting in ' is '. Which isn't what we wanted.
To deal with this problem, I typically do one of two things:
* Replace double quotes with single quotes. In fact, I try to do
this /by default for all strings/, unless I consciously want to
have variable interpolation or need to use C-style escapes like
\t, \n, or \v.
* Escape the $ char so that $s isn't interpreted as a variable.
You'll see this in code in StatusNet where we need \n in the
string. So,
sprintf("%2\$s is %1\$s", 'awesome', 'Evan');
I realize this is kind of boring, but I just removed a bunch of bugs
from StatusNet where we had this kind of interpolation and page titles
were showing up incorrectly.
-Evan
--
Evan Prodromou
CEO, Control Yourself, Inc.
e...@controlyourself.ca - http://identi.ca/evan - +1-514-554-3826
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