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ArrayObject::count

(PHP 5, PHP 7, PHP 8)

ArrayObject::count统计 ArrayObject 内 public 属性的数量

说明

public ArrayObject::count(): int

获取 ArrayObject 的 public 属性数量

参数

此函数没有参数。

返回值

对象 ArrayObject 的 public 属性数量

注意:

当对象 ArrayObject 是从数组构造而来时,所有属性都是 public 的。

示例

示例 #1 ArrayObject::count() 例子

<?php
class Example {
public
$public = 'prop:public';
private
$prv = 'prop:private';
protected
$prt = 'prop:protected';
}

$arrayobj = new ArrayObject(new Example());
var_dump($arrayobj->count());

$arrayobj = new ArrayObject(array('first','second','third'));
var_dump($arrayobj->count());
?>

以上示例会输出:

int(1)
int(3)

add a note

User Contributed Notes 1 note

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0
bienvenunet at yahoo dot com
7 hours ago
<?php
$array_object
= new \ArrayObject([]);
echo
count($array_object); // echos 1 ?!?
echo count($this->getArrayCopy()); // echos the correct answer, 0
?>

Make it make sense. I've spent a few hours trying to figure out why simple tests were failing and had to look this up to figure this out.
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