= 7.3.0, PHP 8)is_countable — Verify that the contents of a variable is a countable value 說明is_countable(mixed $value): boolVerify">

is_countable

(PHP 7 >= 7.3.0, PHP 8)

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

說明

is_countable(mixed $value): bool

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

參數(shù)

value

The value to check

返回值

Returns true if value is countable, false otherwise.

更新日志

版本 說明
7.3.0 is_countable() has been added.

范例

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)

參見

  • is_array() - 檢測(cè)變量是否是數(shù)組
  • is_object() - 檢測(cè)變量是否是一個(gè)對(duì)象
  • is_iterable() - Verify that the contents of a variable is an iterable value
  • is_bool() - 檢測(cè)變量是否是布爾值