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.

示例

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]
?>

以上示例的输出类似于：

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

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用户贡献的备注 2 notes

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acgrid ¶

8 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 ¶

9 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