PHP Object-oriented ____php

PHP object is a few similarities and differences with java,c++,

1.PHP classes can duplicate constructor __construct and destructors, which are similar to C + +, and default to parameterless constructs and destructors if not written

<?php
class Nbaplayer {
}
$jordan = new Nbaplayer ();

Replication construction and destructor functions

<?php
class Nbaplayer {public
	$name;
	public $height;
	public $weight;
	public $team;
	public $teamNumber;

	function __construct ($name, $height, $weight, $team, $teamNumber) {
		$this->name = $name;
		$this->height = $height;
		$this->weight = $weight;
		$this->team = $team;
		$this->teamnumber = $teamNumber;
		echo "Construc A instance:". $name. " <br/> ";
	}
	function __destruct () {
		echo "Destroy A instance:". $this->name. " <br/> ";
	}
}
$jordan = new Nbaplayer ("Jordan", "198cm", "98kg", "Bull", "n");
$james = new Nbaplayer ("James", "205cm", "120kg", "Heat", "10");

2. $jordan is a reference to an object, and the memory release of the PHP object takes a reference count (similar to Java), which is automatically invoked by the GC at 0.

& Create a Shadow (alias) reference without increasing the reference count.

<?php
class Nbaplayer {public
	$name;
	public $height;
	public $weight;
	public $team;
	public $teamNumber;

	function __construct ($name, $height, $weight, $team, $teamNumber) {
		$this->name = $name;
		$this->height = $height;
		$this->weight = $weight;
		$this->team = $team;
		$this->teamnumber = $teamNumber;
		echo "Construc A instance:". $name. " <br/> ";
	}
	function __destruct () {
		echo "Destroy A instance:". $this->name. " <br/> ";
	}
}
$jordan = new Nbaplayer ("Jordan", "198cm", "98kg", "Bull", "n");
$james = new Nbaplayer ("James", "205cm", "120kg", "Heat", "ten");
$james 1 = $james//is equivalent to creating a new reference for the James object
$james 2 = & $james 1;//Create a shadow reference, which is actually an alias
$james = null;
echo "James1 has not yet set to be nulled <br/>";
$james 1 = null;//james object Invocation destructor (whose reference count is 0)
echo "James1 has set to being nulled<br/>";

? >

Run Result:

Construc a Instance:jordan
construc a instance:james
james1 has not yet set to is nulled 
Destroy a Instance:ja Mes
James1 has set to be nulled 
Destroy a Instance:jordan