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<?php class Foo { private $a; protected $b; public $c; } class FooCountable implements \Countable { private $elements = [1,2,3]; public function count() { return count($this->elements); } } $tests = [ 'array' => [1,2,3], 'string' => 'hello world', 'number' => 123, 'iterator' => new \ArrayIterator([1,2,3]), 'countable' => new \FooCountable(), 'zero' => 0, 'string_zero' => '0', 'object' => new \Foo(), 'stdClass' => new \stdClass, 'null' => null, 'empty' => '', 'boolt' => true, 'boolf' => false ]; foreach($tests as $key => $test) { echo $key . ': ' . print_r(@count($test), 1) . \PHP_EOL; } echo '---' . \PHP_EOL; echo 'Undefined: ' . @count($undefinedVariable);
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of FooCountable::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/nmWmE on line 14 array: 3 Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, string given in /in/nmWmE:37 Stack trace: #0 {main} thrown in /in/nmWmE on line 37
Process exited with code 255.

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