SplObjectStorage::offsetGet

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SplObjectStorage::offsetGet — Returns the data associated with an object

说明

public SplObjectStorage::offsetGet(object $object): mixed

Returns the data associated with an object in the storage.

参数

object: The object to look for.

返回值

The data previously associated with the object in the storage.

错误／异常

Throws UnexpectedValueException when object could not be found.

范例

示例 #1 SplObjectStorage::offsetGet() example


<?php
$s = new SplObjectStorage;

$o1 = new StdClass;
$o2 = new StdClass;

$s[$o1] = "hello";
$s->attach($o2);


var_dump($s->offsetGet($o1)); // Similar to $s[$o1]
var_dump($s->offsetGet($o2)); // Similar to $s[$o2]
?>

以上例程的输出类似于：

string(5) "hello"
NULL

参见

SplObjectStorage::offsetSet() - Associates data to an object in the storage
SplObjectStorage::offsetExists() - Checks whether an object exists in the storage
SplObjectStorage::offsetUnset() - Removes an object from the storage

add a note

User Contributed Notes 2 notes

down

acgrid ¶

6 years ago


The performance of SplObjectStorage in PHP7.0.7 has boosted a lot.

SplObjectStorage
double(1.3110690116882)
[object_hash => value]
double(2.4147419929504)

down

kontrollfreak+php at gmail dot com ¶

6 years ago


SplObjectStorage::offsetGet() can become EXTREMELY slow depending on the associated data (PHP 5.6).

<?php

// SplObjectStorage
$object = new stdClass;
$test = new SplObjectStorage;
$test->attach($object, str_repeat("\0", 1024*1024));
$start = microtime(true);
for ($i = 0; $i < 1000000; $i++) {
    $test->offsetGet($object);
}
var_dump(microtime(true) - $start); // 76 seconds!

// Array + spl_object_hash()
$object = new stdClass;
$test = [];
$test[spl_object_hash($object)] =  str_repeat("\0", 1024*1024);
$start = microtime(true);
for ($i = 0; $i < 1000000; $i++) {
    $temp = $test[spl_object_hash($object)];
}
var_dump(microtime(true) - $start); // 0.3 seconds

add a note

官方地址：https://www.php.net/manual/en/splobjectstorage.offsetget.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 Packagist / Composer 中国全量镜像 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 PHPstorm 里面Terminal 不能使用 esc键吗退出编辑模式吗

略微加速

PHP官方手册 - 互联网笔记

SplObjectStorage::offsetGet

说明

参数

返回值

错误／异常

范例

参见

User Contributed Notes 2 notes