Php/docs/function.is-countable
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is_countable
(PHP 7 >= 7.3.0)
is_countable — Verify that the contents of a variable is a countable value
说明
is_countable
( mixed $var
) : bool
Verify that the contents of a variable is an array or an object implementing Countable
参数
var- The value to check
返回值
Returns true if var is countable, false
otherwise.
更新日志
| 版本 | 说明 |
|---|---|
| 7.3.0 | is_countable() has been added. |
范例
Example #1 is_countable() examples
<?phpvar_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)
参见
- is_array() - 检测变量是否是数组
- is_object() - 检测变量是否是一个对象
- is_iterable() - Verify that the contents of a variable is an iterable value
- is_bool() - 检测变量是否是布尔型
