If you want *only* the ?:&/ characters changed then it can be done with a regular rexpression, the e modifier, and the ord(), hex() and strtoupper() functions, post back if you would like an example.
$new_str = str_replace(array('?',':','&','/'),array('3F','3A','26','2F'),$old_string);
should be less costly than a regular expression with an 'e' modifier.
-- ---John Holmes...
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