Calling multiple function in a single line in PHP - php

Question

All my classes that connect to a database need to get values of custom columns from their respective tables. So instead of coding a function for each class, is there a way for me to implement a base class from which my classes extend and I can use that base class function to easily get and update data on my database (at least for simple data).
class Users extend BaseClass
{
private $table = "users";
private $columns = ["name", "email", "password"];
}
so from an outside function, I can access the email value like this
Users->where("name", "John")->getEmail();
or possibly
Users->where("name", "John")->get("email");
I could also use this method to update data to the database. The functions where should be universal so it should exist in BaseClass. (I know the database queries that I should use, what I want to know is how to call get after calling where and also possibly setting multiple where requirements).
Users->where("name", "John")->where("last_name", "Smith")->get("email");

Answer 1

I think you want something like this
abstract class BaseClass
{
private $where_clauses=[];
private $columns=[];
private $table='';
protected function setData($table,$cols){
$this->columns=$cols;
$this->table=$table;
}
public function where($key, $value){
$this->where_clauses[$key]=$value;
return $this;
}
public function get($col){
$sql='SELECT '.$col.' FROM '.$this->table.' WHERE';
$first=true;
foreach($this->where_clauses AS $key=>$val){
if(!$first) sql.=' AND ';
$first=false;
$sql.=$key.' = '.$val;
}
// RUN QUERY, Return result
}
}
Note that the where function returns a reference to $this, which is what let's you string the function calls together (not tested the code). This would also need some adapting to let you put two conditions on the same column.