Description:
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a) strpos($haystack, $t_needle, $offset) will return position of the first $t_needle element found ...

b) strpos($t_haystack, $t_needle, $t_offset) will return an array of corresponding position...

the a) will be very usefull for me ( very cpu time consuming when $t_haystack is about 1 MB and sizeof($t_needle) is great, the haystack is to be scan as many times as the sizeof($t_needle) when I do this within a loop with the current strpos implementation).
Then proposal will need only 1 time scanning ... and it could be possible to optimize the search by pre-scanning the $t_needle array and generate an "automate" that will search for 1 character and then the 2nd one to be just after, and so on...

the b) suggestion is only for the code "beauty"...

(forgive my poor english, I'm french...)