Description:
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I would very much like to see a function that returns all positions of a needle within a haystack.

Similar to strpos but named to strpos_all 

And should return an array with all positions of needle within haystack.

Should also be able to take at least two optional parameters as well: 
one arithmetic operator
one number

see below for explanation of why and motivation.

My specific need is to be able to search a string 5000 chars in length which consist of only zeroes and ones (0 or 1).
And I want to get position of all chars set to 1.

I read through the comments on www.php.net/strpos and the closest solution I could find to what I wanted was this:

$bitvec = str_repeat('1',5000);
$posArr = array();
// next two lines from www.php.net/strpos comments
$pos=-1; // need this to start on first element
while ( ($pos = strpos($bitvec4,'1',$pos+1)) !== false ) $posArr[]=$pos ;

The above is worst case. Normally, for my use, the bitvector, $bitvec, would not have all chars set to 1, but it will happen.

Using the above code to get all the positions where char = 1 is so much slower compared to if someone could write a function that handles this.

IMHO I think this is something many could use.

To make this "new" function "strpos_all" even better,
if possible, I would like it to be able to pass two other values: 
one number and one arithmetic operator
If these are set then I want the value to be stored in
the array element to be (if arithmetic operator was *)
Position * number 

If the new function could NOT do this then, at least I, would have to iterate through all the elements to change the values which again would take a "long" time if done on each element in PHP compared to if done within the "upcoming"
strpos_all function.

Really hope to see a function that can do this.

My goal is to use PHP and database to build a fast 
Seach Engine using a combination of "vectorspace" and "reversed index".
In short I want to do what TBGsearch does with PERL and MYSQL, but using PHP and MYSQL:
http://www.tbg.nu/tbgsearch/

The one thing so far that slow my "PHP solution" to much down is the lack of strpos_all string with my suggested optional parameters (one artithmetic operator and one number).

Keep up the good work!