php - Select a user according to set probability -


my database stores info users, groups, , relationships. 1 of columns, fcount, in users table tracks number of relationships each user has had within current group; starts @ 0, , increment when appropriate.
need write script selects users in given group , randomly selects 1 of them probability of being selected being based on number of relationships 1 has had; fewer relationships means greater probability.

currently, accomplish this, minus probability part, code:

$query = "select uid users groupid=:gid , status='1'"; ... while ($row = $stmt->fetch(pdo::fetch_num)) {     $friends[] = $row[0]; }  foreach ($users $value) {     $key = array_search($value, $friends);     unset($friends[$key]);     shuffle($friends);     $newrel = end($friends);     $user = $value;     $friends[] = $value;      $query = "update users set rel=:newrel uid=:uid";     $query_params = array(':newrel' => $newrel, ':uid' => $user ); ... }

i thinking easiest way adjust probability edit $friends array users show more once. so, users fcount of 0 repeated in array 5 times, , users fcount of 1 repeated 3 times. [maybe isn't best way handle it, makes sense me , fits code have. you're free offer better scheme.]

what haven't managed figure out how take array of users , multiply entries of users ought multiplied.

select uid, fcount users groupid=:gid , status='1';

returns array reflective of table:

+-----+--------+ | uid | fcount | +-----+--------+ | 105 |      3 | | 106 |      2 | | 107 |      0 | | 108 |      0 | | 109 |      1 | +-----+--------+

which turns array this:

array(15) {  [0]=> string(3) "105"  [1]=> string(3) "106"  [2]=> string(3) "107"  [3]=> string(3) "107"  [4]=> string(3) "107"  [5]=> string(3) "107"  [6]=> string(3) "107"  [7]=> string(3) "108"  [8]=> string(3) "108"  [9]=> string(3) "108"  [10]=> string(3) "108"  [11]=> string(3) "108" [12]=> string(3) "109"  [13]=> string(3) "109"  [14]=> string(3) "109"  }

it seems me accomplished foreach pushes each userid n times new array according if statements in loop. i'll try construct it, though i'm fail.

$problist = array(); foreach ($row $value) {     if ($value['fcount'] == 0) {         array_push($problist, $value['uid'], $value['uid'], $value['uid'], $value['uid'], $value['uid']);     } elseif ($value['fcount'] == 1) {         array_push($problist, $value['uid'], $value['uid'], $value['uid']);     } elseif ($value['fcount'] >= 2) {         $problist[] = $value['uid'];     } }

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