Types
PHP Manual

Objects

Object Initialization

To create a new object, use the new statement to instantiate a class:

Example #1 Object Construction

<?php
class foo
{
    function do_foo()
    {
        echo "Doing foo.";
    }
}

$bar = new foo;
$bar->do_foo();
?>

For a full discussion, see the Classes and Objects chapter.

Converting to object

If an object is converted to an object, it is not modified. If a value of any other type is converted to an object, a new instance of the stdClass built-in class is created. If the value was null, the new instance will be empty. An array converts to an object with properties named by keys and corresponding values. Note that in this case before PHP 7.2.0 numeric keys have been inaccessible unless iterated.

Example #2 Casting to an Object

<?php
$obj = (object) array('1' => 'foo');
var_dump(isset($obj->{'1'})); // outputs 'bool(true)'

// Deprecated as of PHP 8.1
var_dump(key($obj)); // outputs 'string(1) "1"'
?>

For any other value, a member variable named scalar will contain the value.

Example #3 (object) cast

<?php
$obj = (object) 'ciao';
echo $obj->scalar;  // outputs 'ciao'
?>