RecursiveArrayIterator::hasChildren

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

RecursiveArrayIterator::hasChildren — Returns whether current entry is an array or an object

说明

public RecursiveArrayIterator::hasChildren(): bool

Returns whether current entry is an array or an object for which an iterator can be obtained via RecursiveArrayIterator::getChildren().

参数

此函数没有参数。

返回值

Returns true if the current entry is an array or an object, otherwise false is returned.

范例

示例 #1 RecursiveArrayIterator::hasChildren() example


<?php
$fruits = array("a" => "lemon", "b" => "orange", array("a" => "apple", "p" => "pear"));

$iterator = new RecursiveArrayIterator($fruits);

while ($iterator->valid()) {

    // Check if there are children
    if ($iterator->hasChildren()) {
        // print all children
        foreach ($iterator->getChildren() as $key => $value) {
            echo $key . ' : ' . $value . "\n";
        }
    } else {
        echo "No children.\n";
    }

    $iterator->next();
}
?>

以上例程会输出：

No children.
No children.
a : apple
p : pear

参见

RecursiveArrayIterator::getChildren() - Returns an iterator for the current entry if it is an array or an object

add a note

User Contributed Notes 1 note

down

Dominik ¶

7 years ago


hasChildren() works as documented here, but not as its name suggests. 

The method does not return whether the current entry actually *has* children. It only returns whether the element's type is one that is able to have children.

This is a bit counterintuitive if you are processing empty arrays.

Example:

<?php
$data = array(
    "element one" => array(true),
    "element two" => array(),
    "element three" => array(true),
);

$i = new RecursiveIteratorIterator(new RecursiveArrayIterator($data),RecursiveIteratorIterator::SELF_FIRST);

foreach($i as $key => $value)
{
    $type = gettype($value);
    $depth = $i->getDepth();

    if($i->hasChildren()) {
        echo "$depth: $key ($type) has children\n";
    } else {
        echo "$depth: $key ($type) has no children\n";
    }
}
?>

Result:

0: element one (array) has children
1: 0 (boolean) has no children
0: element two (array) has children
0: element three (array) has children
1: 0 (boolean) has no children

add a note

官方地址：https://www.php.net/manual/en/recursivearrayiterator.haschildren.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP获取指定函数定义在哪个文件中及行号 PHP mkdir()写出来的权限与mode值不符合 adodb连接mysql多个数据库的问题利用php soap实现web service 利用PHP SOAP实现WEB SERVICE

略微加速

PHP官方手册 - 互联网笔记

RecursiveArrayIterator::hasChildren

说明

参数

返回值

范例

参见

User Contributed Notes 1 note