Variable handling 函数
PHP Manual

is_countable

(PHP 7 >= 7.3.0)

is_countable Verify that the contents of a variable is a countable value

说明

bool is_countable ( mixed $var )

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([123])); // 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


Variable handling 函数
PHP Manual