SplObjectStorage::offsetGet

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

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

    Опис

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

    Returns the data associated with an object in the storage.

    Параметри

    object

    The object to look for.

    Значення, що повертаються

    The data previously associated with the object in the storage.

    Помилки/виключення

    Throws UnexpectedValueException when object could not be found.

    Приклади

    Приклад #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]
    ?>

    Поданий вище приклад виведе щось схоже на:

    string(5) "hello"
NULL

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    User Contributed Notes 2 notes

    up
    1
    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)
    up
    1
    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
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