is_countable
(PHP 7 >= 7.3.0, PHP 8)
is_countable — Verify that the contents of a variable is a countable value
說明
Verify that the contents of a variable is an array or an object implementing Countable
參數
-
value -
The value to check
返回值
Returns true if value is countable, false
otherwise.
更新日誌
| 版本 | 說明 |
|---|---|
| 7.3.0 | is_countable() has been added. |
範例
示例 #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)
參見
- is_array() - 檢測變數是否是陣列
- is_object() - 檢測變數是否是一個對像
- is_iterable() - Verify that the contents of a variable is an iterable value
- is_bool() - 檢測變數是否是布爾值