This error occurs when inheriting the abstract class aDB. If you do not inherit, no error will be reported.

Question

<?php

abstract class aDB{

/*

* Connect to the database and read configuration information from the configuration file

*/

abstract public function conn();

abstract public function query ();

// abstract public function getAll();

##}

##class Mysql extends aDB{

public $link;

/*

*Connect to the database and read from the configuration file Configuration information

*/

public function conn(){

include 'config.php';

$this->link = new mysqli ($cfg['host'], $cfg['user'], $cfg['pwd'], $cfg['db']);

var_dump($this->link);

}

public function query($sql){

return $this->link- >query($sql);

}

## // public function getAll($sql){

// $res = $this->query($sql);

// var_dump($res);

// }

}

$mysql = new Mysql();

$mysql->conn();

?>

Answer 1

Solved, solved, the abstract method does not give parameters, it is too careless