use muliple method in one object in php [duplicate] - php

Question

This question already has answers here:
PHP method chaining or fluent interface?
(10 answers)
Closed 9 years ago.
I am new to php and crating classes for my project . I have reached this far ..
$db->select('id');
$db->from('name');
$db->where("idnum<:num");
$db->bindparamers(':num',100);
$rows=$db->executeQuery();
I wana know to create methods such that i can use all thing at once like below
$db->select('id')->from('name')->where('idnum>100')->executeQuery();
I have tried searching but not getting what exactly i should search for
here is my class structure
class Dbconnections
{
//For Complex Queries
public function select($items)
{
}
public function from($tablenames)
{
}
public function where($arr)
{
}
public function orderby($order)
{
}
public function bindparamers($parameter,$value)
{
}
public function executeQuery()
{}
}
What changes i need to make to use it as :
$db->select('id')->from('name')->where('idnum>100')->executeQuery();

Answer 1

It's called method chaining and in your case can be achieved by returning $this from each method.
class Dbconnections
{
public function select($items)
{
// ...
return $this;
}
public function from($tablenames)
{
// ...
return $this;
}
public function where($arr)
{
// ...
return $this;
}
public function orderby($order)
{
// ...
return $this;
}
public function bindparamers($parameter,$value)
{
// ...
return $this;
}
public function executeQuery()
{
// ...
return $this;
}
}