(PECL apc >= 3.1.4)
apc_exists — 锟斤拷锟紸PC锟斤拷锟角凤拷锟斤拷锟侥筹拷锟斤拷锟斤拷锟侥承﹌ey
锟斤拷锟終ey锟斤拷锟节的伙拷锟斤拷锟斤拷 TRUE , 锟斤拷锟津返伙拷 FALSE 锟斤拷锟斤拷锟斤拷锟�
keys锟斤拷一锟斤拷array 锟斤拷
锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷锟叫达拷锟节碉拷key锟斤拷锟斤拷锟介，锟斤拷锟斤拷锟斤拷锟斤拷锟叫碉拷key一锟斤拷锟斤拷锟斤拷锟斤拷锟节的伙拷锟斤拷
锟酵凤拷锟截空碉拷锟斤拷锟介。
Example #1 apc_exists() 锟斤拷锟斤拷
<?php
$fruit = 'apple';
$veggie = 'carrot';
apc_store('foo', $fruit);
apc_store('bar', $veggie);
if (apc_exists('foo')) {
echo "Foo exists: ";
echo apc_fetch('foo');
} else {
echo "Foo does not exist";
}
echo PHP_EOL;
if (apc_exists('baz')) {
echo "Baz exists.";
} else {
echo "Baz does not exist";
}
echo PHP_EOL;
$ret = apc_exists(array('foo', 'donotexist', 'bar'));
var_dump($ret);
?>
锟斤拷锟斤拷锟斤拷锟教碉拷锟斤拷锟斤拷锟斤拷锟斤拷冢锟�
Foo exists: apple
Baz does not exist
array(2) {
["foo"]=>
bool(true)
["bar"]=>
bool(true)
}