is_countable

(PHP 7 >= 7.3.0)

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

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is_countable ( mixed $var ) : bool

Verify that the contents of a variable is an array or an object implementing Countable

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var

The value to check

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Returns TRUE if var is countable, FALSE otherwise.

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7.3.0 is_countable() has been added.

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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)

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  • is_array() - �������Ƿ�������
  • is_object() - �������Ƿ���һ������
  • is_iterable() - Verify that the contents of a variable is an iterable value
  • is_bool() - �������Ƿ��Dz�����