From: krudtaa at yahoo dot com
Operating system: all
PHP version: 5.2.0
PHP Bug Type: Feature/Change Request
Bug description: Want a function strpos_all with optional parameters
Description:
------------
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!
--
Edit bug report at http://bugs.php.net/?id=40182&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=40182&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=40182&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=40182&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=40182&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=40182&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=40182&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=40182&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=40182&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=40182&r=support
Expected behavior: http://bugs.php.net/fix.php?id=40182&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=40182&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=40182&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=40182&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40182&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=40182&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=40182&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=40182&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=40182&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=40182&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=40182&r=mysqlcfg
