(PHP 5 >= 5.3.3)
PDO::pgsqlCopyToFile — Copy data from table into file
$table_name
   , string $filename
   [, string $delimiter = '\t'
   [, string $null_as = "\\\\N"
   [, string $fields
  ]]] )
   Copies data from table into file specified by filename
   using delimiter as fields delimiter and fields list
  
table_nameString containing table name
filenameFilename to export data
delimiter
       Delimiter used in file specified by filename
      
null_asHow to interpret null values
fieldsList of fields to insert
   Returns TRUE on success, or FALSE on failure.