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(PHP 7 >= 7.3.0, PHP 8)
is_countable — Verify that the contents of a variable is a countable value
Verify that the contents of a variable is an array or an object implementing Countable
value
The value to check
Returns true if value is countable, false
otherwise.
| 版本 | 说明 |
|---|---|
| 7.3.0 | is_countable() has been added. |
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)
