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   1 # pq\Gateway\Rowset pq\Gateway\Rowset::filter(callable $cb)
   2
   3 Filter the rows a copy of the rowset should contain.
   4
   5 ## Params:
   6
   7 * callable $cb
   8   A filter callback which should return bool as function(pq\Gateway\Row $row)
   9
  10 ## Returns:
  11
  12 * pq\Gateway\Rowset, clone.
  13
  14 ## Example:
  15
  16         <?php
  17
  18         use pq\Gateway\Table;
  19
  20         $table = new Table("account");
  21         $table->find()
  22                 ->apply(function($row) {
  23                         // ...
  24                 })->filter(function ($row) {
  25                         return $row->isDirty();
  26                 })->update();
  27
  28         ?>