find the last instance of / and replace it with /t_ in a string


I want to be able to find the last instance of / in a string and replace it with /t_ how can I achieve that please?

I'm guessing its some use of strrpos or regex  but I cant then figure out how I'd add the bit in the middle?

Neil ThompsonSenior Systems DeveloperAsked:
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Using Regex:
$str = "/a/b/c";
echo preg_replace('#(.*?)/([^/])$#', "$1/t_$2", $str) . "\n";

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Using strrpos:
$str = "/a/b/c";
$last_pos = strrpos($str,"/");
if( false !== $last_pos)
    echo substr($str,0,$last_pos).'/t_' . substr($str,$last_pos+1);

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Neil ThompsonSenior Systems DeveloperAuthor Commented:
Brilliant, 2 in 1 :)

Thanks so much
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