CachingIterator::offsetSet
(PHP 5 >= 5.2.0, PHP 7, PHP 8)
CachingIterator::offsetSet — The offsetSet purpose
说明
public CachingIterator::offsetSet(string$key, mixed $value): void
警告本函数还未编写文档，仅有参数列表。
参数
key
The index of the element to be set.
value
The new value for the key.
返回值
没有返回值。
User Contributed Notes 1 note
up down 0 ddrake at dreamingmind dot com ¶2 years ago
offsetSet($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
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官方地址：https://www.php.net/manual/en/cachingiterator.offsetset.php