original_string: public function header ( $header, $value ) {
  			if( $this->write_started ) { throw new InvalidOperationException( "Can not write header, body writing has started." ); }
  			fwrite( $this->socket, "$header: $value\r\n" );
  			fflush( $this->socket );
  		}
code: public function header ( $header, $value ) {
  			if( $this->write_started ) { throw new InvalidOperationException( "Can not write header, body writing has started." ); }
  			fwrite( $this->socket, "$header: $value\r\n" );
  			fflush( $this->socket );
  		}
code_tokens: public function header ( $ header , $ value ) { if ( $ this -> write_started ) { throw new InvalidOperationException ( "Can not write header, body writing has started." ) ; } fwrite ( $ this -> socket , "$header: $value\r\n" ) ; fflush ( $ this -> socket ) ; }
docstring: Add an HTTP header
  
  @param $header
  @param $value
docstring_tokens: Add an HTTP header