(PECL apc >= 3.0.0)
apc_fetch — Fetch a stored variable from the cache
The key used to store the value (with apc_store()).
Set to TRUE in success and FALSE in failure.
The stored variable on success; FALSE on failure
Example #1 A apc_fetch() example
<?php
$bar = 'BAR';
apc_store('foo', $bar);
var_dump(apc_fetch('foo'));
?>
上例将输出：
string(3) "BAR"