# 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

    <?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)

### 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