Get Class reference from a member object - php

Question

I am trying to build some classes for a project and I was wondering how to achieve the following. I am not really sure how to ask this with words but I will provide an example:
class Table{
private $name;
private $fields = [];
public function addField(Field $field){
$this->fields[$field->getName()] = $field;
}
public function getName(){
return $this->name;
}
}
class Field{
private $name;
public function getName(){
return $this->name;
}
public function getTableName(){
//return Table::getName
}
public function getTable(){
//return a ref to the Table object
}
}
$table = new Table();
$field = new Field();
$table->addField($field);
What I am trying to achieve here, once the $field is added to the $table, is there some sort of way to get the reference of the $table from any of the methods in the $field object
I would greatly appreciate any help or ideas how to restructure it so I can achieve my goal
Thank you in advance

Answer 1

class Table{
private $name;
private $fields = [];
public function addField(Field $field){
$this->field->setTable($this);
$this->fields[$field->getName()] = $field;
}
public function getName(){
return $this->name;
}
}
class Field{
private $name;
private $relatedTable;
public function getName(){
return $this->name;
}
public function setName($name){
$this->name = $name;
}
public function getTableName(){
return $this->relatedTable->getName();
}
public function getTable(){
return $this->relatedTable;
}
public function setTable(Table $table){
$this->relatedTable = $table;
}
}
$field = new Field;
$field->setName('Field1');
$table = new Table;
$table->addField($field);
echo $field->getTable()->getName();
Although you have to be aware that when you pass an object to a function, it will be passed by "reference" (I know there's another term for this.)
// in case you're running it in a for loop
$field = new Field;
$table = new Table;
for($i = 0; $i < 3; $i++)
{
$field->setName("Field{$i}");
$table->addField(clone $field); // notice the clone there.
}
I think this approach is kind of similar with Observer Pattern