SplObjectStorage::offsetGet

(PHP 5 >= 5.3.0, PHP 7)

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

Description

public mixed SplObjectStorage::offsetGet ( object $object )

Returns the data associated with an object in the storage.

Parameters

object: The object to look for.

Return Values

The data previously associated with the object in the storage.

Errors/Exceptions

Throws UnexpectedValueException when object could not be found.

Examples

Example #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]
?>

The above example will output something similar to:

string(5) "hello"
NULL

User Contributed Notes

kontrollfreak+php at gmail dot com

9 months 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