Varible Trick - Help!

[Anon]

I want PHP to look through a varible and find a certian text, and then replace that text with something else, for example, in perl, this would look like:
$line =~ s/texttofind/textforreplacing/g;

[Anon]

http://php.net/ereg_replace
$foo = 'You are here';
$foo = ereg_replace("are","were",$foo);
echo $foo;

output:
'You were here'

[Anon]

Thanks a ton! Your great!