array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'function.is-countable.php', 1 => 'is_countable', ), 'up' => array ( 0 => 'ref.var.php', 1 => '变量处理函数', ), 'prev' => array ( 0 => 'function.is-callable.php', 1 => 'is_callable', ), 'next' => array ( 0 => 'function.is-double.php', 1 => 'is_double', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'zh', 'path' => 'reference/var/functions/is-countable.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 7 >= 7.3.0, PHP 8)
is_countable — 验证变量内容是否为可数值
value
需要检查的值
版本 | 说明 |
---|---|
7.3.0 | is_countable() 被添加。 |
示例 #1 is_countable() 示例
<?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)