If you are unable to upgrade to PHP 7.3 (not released at the time of writing), you can use this simple polyfill:
<?php
if (!function_exists('is_countable')) {
function is_countable($var) {
return (is_array($var) || $var instanceof Countable);
}
}
?>
is_countable
(PHP 7 >= 7.3.0)
is_countable — Verify that the contents of a variable is a countable value
Descrierea
Verify that the contents of a variable is an array or an object implementing Countable
Parametri
-
value -
The value to check
Valorile întoarse
Returns true if value is countable, false
otherwise.
Istoricul schimbărilor
| Versiune | Descriere |
|---|---|
| 7.3.0 | is_countable() has been added. |
Exemple
Example #1 is_countable() examples
<?php
var_dump(is_countable([1, 2, 3])); // bool(true)
var_dump(is_countable(new ArrayIterator(['foo', 'bar', 'baz']))); // bool(true)
var_dump(is_countable(new ArrayIterator())); // bool(true)
var_dump(is_countable(new stdClass())); // bool(false)
A se vedea și
- is_array() - Determină dacă o variabilă este un array
- is_object() - Determină dacă o variabilă este un obiect
- is_iterable() - Verify that the contents of a variable is an iterable value
- is_bool() - Determină dacă o variablă este un boolean
add a note
User Contributed Notes 3 notes
info at arisendrake dot de ¶
5 years ago
renic ¶
4 years ago
be wary of using is_object($var) and assuming that the object has implemented Countable. Not all objects are countable directly with count().
danmichaelo at gmail dot com ¶
5 years ago
Note that a polyfill for this method is also provided by the symfony/polyfill project.
