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Implement nullsafe ?-> operator
RFC: https://wiki.php.net/rfc/nullsafe_operator Closes GH-5619. Co-authored-by: Nikita Popov <[email protected]>
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‎UPGRADING

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@@ -607,6 +607,8 @@ PHP 8.0 UPGRADE NOTES
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inheritance rules on the methods of a child class. (with the exception of
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final private constructors)
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RFC: https://wiki.php.net/rfc/inheritance_private_methods
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. Added support for nullsafe operator (`?->`).
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RFC: https://wiki.php.net/rfc/nullsafe_operator
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- Date:
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. Added DateTime::createFromInterface() and

‎Zend/tests/nullsafe_operator/001.phpt

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--TEST--
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Test basic nullsafe method calls
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--FILE--
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<?php
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class Foo {
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function null() {
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var_dump('Foo::null()');
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return null;
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}
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function self() {
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var_dump('Foo::self()');
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return $this;
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}
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}
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var_dump(null?->bar());
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var_dump(null?->bar(var_dump('Not executed')));
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var_dump(null?->bar()->baz());
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var_dump(null?->bar()->baz(var_dump('Not executed')));
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var_dump(null?->bar()->baz);
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var_dump(null?->bar()::$baz);
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var_dump(null?->bar()::baz());
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$foo = new Foo();
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var_dump($foo->null()?->bar());
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var_dump($foo->null()?->bar(var_dump('Not executed')));
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var_dump($foo->null()?->bar()->baz());
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var_dump($foo->null()?->bar()->baz(var_dump('Not executed')));
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var_dump($foo->null()?->bar()->baz);
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var_dump($foo->null()?->bar()::$baz);
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var_dump($foo->null()?->bar()::baz());
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$foo = new Foo();
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var_dump($foo?->self(var_dump('Executed'))->null()?->bar());
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var_dump($foo?->self(var_dump('Executed'))->null()?->bar(var_dump('Not executed')));
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var_dump($foo?->self(var_dump('Executed'))->null()?->bar()->baz());
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var_dump($foo?->self(var_dump('Executed'))->null()?->bar()->baz(var_dump('Not executed')));
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var_dump($foo?->self(var_dump('Executed'))->null()?->bar()->baz);
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var_dump($foo?->self(var_dump('Executed'))->null()?->bar()::$baz);
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var_dump($foo?->self(var_dump('Executed'))->null()?->bar()::baz());
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var_dump($foo->self(null?->bar())->null());
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try {
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var_dump($foo?->self()[null?->bar()]);
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} catch (Throwable $e) {
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var_dump($e->getMessage());
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}
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?>
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--EXPECT--
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NULL
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NULL
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NULL
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NULL
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NULL
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NULL
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NULL
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string(11) "Foo::null()"
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NULL
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string(11) "Foo::null()"
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NULL
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string(11) "Foo::null()"
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NULL
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string(11) "Foo::null()"
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NULL
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string(11) "Foo::null()"
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NULL
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string(11) "Foo::null()"
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NULL
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string(11) "Foo::null()"
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NULL
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string(8) "Executed"
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string(11) "Foo::self()"
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string(11) "Foo::null()"
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NULL
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string(8) "Executed"
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string(11) "Foo::self()"
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string(11) "Foo::null()"
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NULL
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string(8) "Executed"
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string(11) "Foo::self()"
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string(11) "Foo::null()"
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NULL
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string(8) "Executed"
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string(11) "Foo::self()"
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string(11) "Foo::null()"
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NULL
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string(8) "Executed"
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string(11) "Foo::self()"
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string(11) "Foo::null()"
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NULL
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string(8) "Executed"
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string(11) "Foo::self()"
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string(11) "Foo::null()"
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NULL
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string(8) "Executed"
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string(11) "Foo::self()"
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string(11) "Foo::null()"
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NULL
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string(11) "Foo::self()"
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string(11) "Foo::null()"
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NULL
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string(11) "Foo::self()"
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string(38) "Cannot use object of type Foo as array"

‎Zend/tests/nullsafe_operator/002.phpt

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--TEST--
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Test nullsafe strict type check
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--FILE--
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<?php
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try {
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false?->bar();
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} catch (Throwable $e) {
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var_dump($e->getMessage());
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}
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try {
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[]?->bar();
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} catch (Throwable $e) {
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var_dump($e->getMessage());
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}
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try {
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(0)?->bar();
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} catch (Throwable $e) {
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var_dump($e->getMessage());
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}
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try {
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(0.0)?->bar();
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} catch (Throwable $e) {
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var_dump($e->getMessage());
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}
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try {
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''?->bar();
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} catch (Throwable $e) {
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var_dump($e->getMessage());
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}
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?>
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--EXPECT--
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string(39) "Call to a member function bar() on bool"
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string(40) "Call to a member function bar() on array"
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string(38) "Call to a member function bar() on int"
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string(40) "Call to a member function bar() on float"
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string(41) "Call to a member function bar() on string"

‎Zend/tests/nullsafe_operator/003.phpt

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--TEST--
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Test basic nullsafe property fetching
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--FILE--
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<?php
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class Foo {
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public $bar = 'bar';
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function qux() {
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return 'qux';
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}
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}
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$null = null;
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$foo = new Foo();
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var_dump(null?->bar);
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var_dump(null?->baz);
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var_dump(null?->qux());
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var_dump(null?->quux());
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var_dump((new Foo)?->bar);
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var_dump((new Foo)?->baz);
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var_dump((new Foo)?->qux());
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try {
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var_dump((new Foo)?->quux());
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} catch (Throwable $e) {
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var_dump($e->getMessage());
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}
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var_dump("{$null?->foo}");
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var_dump("{$null?->bar}");
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var_dump("{$null?->qux()}");
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var_dump("{$null?->quux()}");
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var_dump("{$foo?->bar}");
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var_dump("{$foo?->baz}");
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var_dump("{$foo?->qux()}");
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try {
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var_dump("{$foo?->quux()}");
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} catch (Throwable $e) {
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var_dump($e->getMessage());
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}
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?>
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--EXPECTF--
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NULL
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NULL
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NULL
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NULL
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string(3) "bar"
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Warning: Undefined property: Foo::$baz in %s.php on line 20
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NULL
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string(3) "qux"
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string(36) "Call to undefined method Foo::quux()"
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string(0) ""
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string(0) ""
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string(0) ""
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string(0) ""
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string(3) "bar"
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Warning: Undefined property: Foo::$baz in %s.php on line 34
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string(0) ""
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string(3) "qux"
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string(36) "Call to undefined method Foo::quux()"

‎Zend/tests/nullsafe_operator/004.phpt

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--TEST--
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Test nullsafe property assignment
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--FILE--
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<?php
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$foo = null;
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var_dump($foo?->bar = 'bar');
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?>
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--EXPECTF--
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Fatal error: Can't use nullsafe operator in write context in %s.php on line 4

‎Zend/tests/nullsafe_operator/005.phpt

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--TEST--
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Test nullsafe property assignment op
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--FILE--
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<?php
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$foo = null;
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$foo?->bar += 1;
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?>
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--EXPECTF--
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Fatal error: Can't use nullsafe operator in write context in %s.php on line 4

‎Zend/tests/nullsafe_operator/006.phpt

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--TEST--
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Test nullsafe property post increment
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--FILE--
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<?php
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$foo = null;
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++$foo?->bar;
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?>
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--EXPECTF--
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Fatal error: Can't use nullsafe operator in write context in %s.php on line 4

‎Zend/tests/nullsafe_operator/007.phpt

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--TEST--
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Test nullsafe property pre increment
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--FILE--
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<?php
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$foo = null;
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var_dump($foo?->bar++);
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?>
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--EXPECTF--
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Fatal error: Can't use nullsafe operator in write context in %s.php on line 4

‎Zend/tests/nullsafe_operator/008.phpt

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--TEST--
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Test nullsafe property coalesce assignment
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--FILE--
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<?php
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$foo = null;
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var_dump($foo?->bar ??= 'bar');
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?>
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--EXPECTF--
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Fatal error: Can't use nullsafe operator in write context in %s.php on line 4

‎Zend/tests/nullsafe_operator/009.phpt

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--TEST--
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Test fetch nullsafe property by ref
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--FILE--
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<?php
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$foo = null;
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$ref = &$foo?->bar
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?>
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--EXPECTF--
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Fatal error: Cannot take reference of a nullsafe chain in %s.php on line 4

‎Zend/tests/nullsafe_operator/010.phpt

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--TEST--
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Test fetch nested nullsafe property by ref
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--FILE--
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<?php
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$foo = null;
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$ref = &$foo?->bar->baz;
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?>
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--EXPECTF--
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Fatal error: Cannot take reference of a nullsafe chain in %s.php on line 4

‎Zend/tests/nullsafe_operator/011.phpt

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--TEST--
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Test isset and empty on nullsafe property
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--FILE--
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<?php
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class Foo {
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public $bar;
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}
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class Bar {
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public $baz;
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}
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$bar = new Bar();
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$bar->baz = 'baz';
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var_dump(isset($foo?->bar));
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var_dump(empty($foo?->bar));
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var_dump(isset($foo?->bar->baz));
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var_dump(empty($foo?->bar->baz));
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echo "\n";
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$foo = null;
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var_dump(isset($foo?->bar));
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var_dump(empty($foo?->bar));
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var_dump(isset($foo?->bar->baz));
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var_dump(empty($foo?->bar->baz));
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echo "\n";
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$foo = new Foo();
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var_dump(isset($foo?->bar->baz));
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var_dump(empty($foo?->bar->baz));
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$foo->bar = $bar;
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var_dump(isset($foo?->bar->baz));
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var_dump(empty($foo?->bar->baz));
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?>
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--EXPECT--
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bool(false)
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bool(true)
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bool(false)
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bool(true)
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bool(false)
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bool(true)
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bool(false)
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bool(true)
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bool(false)
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bool(true)
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bool(true)
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bool(false)

‎Zend/tests/nullsafe_operator/012.phpt

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--TEST--
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Test nullsafe property on reference
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--FILE--
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<?php
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6+
class Foo {
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public $bar;
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}
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$foo = new Foo();
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$foo->bar = 'bar';
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$fooRef = &$foo;
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var_dump($fooRef?->bar);
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?>
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--EXPECT--
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string(3) "bar"

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