The manual states that:
"Some types of data can not be serialized [...]. It
includes [...] objects with circular references (i.e.
objects which passes a reference to itself to another
object)."
I wrote a PHPUnit Test[1] that proofs the opposite. Is it
possible, that the information above is outdated and that
circular references can be handled by recent PHP versions?
class TestPhpSerializationCircular extends
PHPUnit_Framework_TestCase
{
public function testSerializeCircular()
{
$a = new SerializableObject;
$b = new SerializableObject;
$a->ref = $b;
$b->ref = $a;
$serial = serialize( $a );
$this->assertType( 'string', $serial );
$this->assertTrue( strlen( $serial ) > 10 );
}
public function testSerializeCircularPreservesIdentity()
{
$a = new SerializableObject;
$b = new SerializableObject;
$a->ref = $b;
$b->ref = $a;
$serial = serialize( $a );
$after = unserialize( $serial );
$after->ref->ref->property = 'test';
$this->assertSame( $after->property,
$after->ref->ref->property );
}
}
[1] http://tinyurl.com/2ktda7
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