CachingIterator::offsetSet()

(PHP 5>=5.2.0,PHP 7)

The offsetSet purpose

说明

publicCachingIterator::offsetSet(mixed $index,mixed $newval) : void

Warning
本函数还未编写文档，仅有参数列表。

参数

$index: The index of the element to be set.
$newval: The new value for the$index.

返回值

没有返回值。

offsetSet($index, $newval) will change an existing cache value or create a new cache entry
<?php
    $cache = new \CachingIterator(
      new \ArrayIterator(['a', 'b', 'c', 'd']),
      \CachingIterator::FULL_CACHE);
    $shortRange = range(0, 1);
    foreach ($shortRange as $index) {
      $cache->next();
    }
    echo PHP_EOL . 'The cache' . PHP_EOL;
    var_export($cache->getCache());
    echo PHP_EOL;
    echo $cache->offsetSet('0', 'manual change') . PHP_EOL;
    echo $cache->offsetSet('3', 'manual entry') . PHP_EOL;
?>
The cache
array (
 0 => 'a',
 1 => 'b',
)
The cache
array (
 0 => 'manual change',
 1 => 'b',
 3 => 'manual entry',
)
There is no requirement that the offset exist in the inner iterator, or that the offset exists in the cache.
<?php
    $cache = new \CachingIterator(
      new \ArrayIterator([]),
      \CachingIterator::FULL_CACHE);
    echo $cache->offsetSet('22', 'manual entry') . PHP_EOL;
    echo PHP_EOL . 'The cache' . PHP_EOL;
    var_export($cache->getCache());
    echo PHP_EOL;
    print_r("cache offset '22' " .
      ($cache->offsetExists('22') == 1
        ? 'exists'
        : "doesn't exist"
      ) . PHP_EOL);
?>
The cache
array (
 22 => 'manual entry',
)
cache offset '22' exists