(PECL yac >= 1.0.0)
Yac::delete — Remove items from cache
Removes one or more items from the cache.
Hinweis:
Deletion is implemented by marking the entry expired rather than clearing its slot: the entry immediately stops being readable, but the slot stays occupied until the same key is stored again or a later write reclaims the slot. As a result, the used-slot count reported by Yac::info() does not decrease after a deletion, and Yac::dump() still lists the deleted entry until its slot is recycled; a non-zero
ttlin the past marks a deleted or expired entry, so when inspecting the output of Yac::dump(), such entries have to be filtered out by the caller.
Returns true on success, or false if the key was not present in
the cache. Because a deletion only marks the entry expired, a key
that was deleted but not yet overwritten still counts as present:
deleting the same key again returns true.
When an array of keys is given, true is returned
only if every key was present; if any key is missing, false is
returned.
Beispiel #1 Yac::delete() example
<?php
$yac = new Yac();
$yac->set("foo", "bar");
var_dump($yac->delete("foo")); // bool(true): marked expired
var_dump($yac->get("foo")); // bool(false): a miss from now on
var_dump($yac->delete("foo")); // bool(true) again: the slot has not
// been overwritten yet
var_dump($yac->delete("never")); // bool(false): was never stored
// a deletion does not free the slot: slots_used does not drop, and
// the expired entry still shows up in the dump
var_dump($yac->info()["slots_used"]); // int(1)
print_r($yac->dump()); // "foo" is still listed; its ttl
// is in the past
?>Beispiel #2 Delayed deletion
<?php
$yac = new Yac();
// keep the entry readable for 60 more seconds before it expires
$yac->set("tmp", "value");
var_dump($yac->delete("tmp", 60)); // bool(true)
?>Beispiel #3 Deleting multiple keys at once
<?php
$yac = new Yac();
$yac->set("tmp", "value");
// returns true only when every key was present
var_dump($yac->delete(array("tmp", "nope"))); // bool(false): "nope" missing
?>