PO::import_from_file( string $filename ): bool

296		public function import_from_file( $filename ) {297			$f = fopen( $filename, 'r' );298			if ( ! $f ) {299				return false;300			}301			$lineno = 0;302			while ( true ) {303				$res = $this->read_entry( $f, $lineno );304				if ( ! $res ) {305					break;306				}307				if ( '' === $res['entry']->singular ) {308					$this->set_headers( $this->make_headers( $res['entry']->translations[0] ) );309				} else {310					$this->add_entry( $res['entry'] );311				}312			}313			PO::read_line( $f, 'clear' );314			if ( false === $res ) {315				return false;316			}317			if ( ! $this->headers && ! $this->entries ) {318				return false;319			}320			return true;321		}