or_like($field[, $match = ''[, $side = 'both'[, $escape = NULL]]]) 
Parameters:
$field (string) – Field name 
$match (string) – Text portion to match 
$side (string) – Which side of the expression to put the ‘%’ wildcard on 
$escape (bool) – Whether to escape values and identifiers  Returns:
CI_DB_query_builder instance (method chaining)  Return type:
CI_DB_query_builder  
Adds a LIKE clause to a query, separating multiple class with OR.