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@ 2018-09-26T17:05:34Z

<?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
];

function countValid($array_or_countable, $mode = \COUNT_NORMAL)
{
    if (
        (\PHP_VERSION_ID >= 70300 && \is_countable($array_or_countable)) ||
        \is_array($array_or_countable) ||
        $array_or_countable instanceof \Countable
    ) {
        return \count($array_or_countable, $mode);
    }

    return null === $array_or_countable ? 0 : 1;
}

foreach($tests as $key => $test) {
    echo $key . ': ' . print_r(countValid($test), 1) . \PHP_EOL;
}

echo 'undefined: ' . print_r(countValid($undefined), 1) . \PHP_EOL;

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/8M0Wd on line 14 array: 3 string: 1 number: 1 iterator: 3 countable: 3 zero: 1 string_zero: 1 object: 1 stdClass: 1 null: 0 empty: 1 boolt: 1 boolf: 1 Warning: Undefined variable $undefined in /in/8M0Wd on line 53 undefined: 0

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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