adds a new filtration rule to collection.
$coll->add("name","value"); // $name LIKE $value //or $coll->add("name","value","comp_oper"); //name < value
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clears collection (deletes all specified filtration rules).
$coll->clear();
Parameters:
checks if there are some rules in collection for the specified field and returns related hash.
$index = $coll->index("name");
Parameters:
Returns:
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array of all specified sorting rules.
$name = $coll->rules[0]["name"] $coll->rules[0]["value"]="cde";
Properties:
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