Member Variables in a Class

member-vars.php

// Is there a difference between the two ways shown below of declaring a member variable in a class?
// If not, would there be a preference of one over the other?

class Foo {
  public $bar = "baz";
}

class Foo2 {

  public function __construct() {
    $this->bar = "baz";
  }
  
}

Did you get my IM?
These are equivalent, until the value of baz gets complicated; What if baz was an object (database connection i.e. PDO)? Then you would could have a default value of NULL, create the extra object outside of FOO or FOO2, and then pass it in and set it in the constructor.

`<?php

class Foo
{
public $database = null;
public $bar = 'baz';
public function __construct(PDO $databaseObject)
{
$this->database = $this->setDatabase($database);
$this->baz = $this->SomeotherComplicatedFunction();
}
public function setDatabase(PDO $database)
{
//Validate and make changes that only Foo3 needs
if ($database->getAttribute(PDO::ATTR_TIMEOUT) === null) {
$database->setAttribute(PDO::ATTR_TIMEOUT, 10000);
}
}
}`