public function cas($key, $old, $new)
{
if (CACHE_STATUS) {
apc_cas($key, $old, $new);
}
return false;
}
public function cas($key, $old, $new)
{
if (_cacheStatus) {
apc_cas($key, $old, $new);
}
return FALSE;
}
/**
* Compare and set
*
* @param string $key
* @param mixed $old
* @param mixed $new
* @return bool
*/
public function cas($key, $old, $new)
{
// apc only does cas for ints
if (is_int($old) and is_int($new)) {
return apc_cas($this->getPrefix() . $key, $old, $new);
} else {
return $this->casEmulated($key, $old, $new);
}
}
public static function cas($k, $ov, $nv)
{
if (function_exists('apc_cas')) {
return apc_cas($k, $ov, $nv);
} elseif (function_exists('apcu_cas')) {
return apcu_cas($k, $ov, $nv);
}
return false;
}
public function updateGauge(array $data)
{
$valueKey = $this->valueKey($data);
if ($data['command'] == Adapter::COMMAND_SET) {
apc_store($valueKey, $this->toInteger($data['value']));
apc_store($this->metaKey($data), json_encode($this->metaData($data)));
} else {
$new = apc_add($valueKey, $this->toInteger(0));
if ($new) {
apc_store($this->metaKey($data), json_encode($this->metaData($data)));
}
// Taken from https://github.com/prometheus/client_golang/blob/66058aac3a83021948e5fb12f1f408ff556b9037/prometheus/value.go#L91
$done = false;
while (!$done) {
$old = apc_fetch($valueKey);
$done = apc_cas($valueKey, $old, $this->toInteger($this->fromInteger($old) + $data['value']));
}
}
}
function apcu_cas($key, $old, $new)
{
return apc_cas($key, $old, $new);
}
/**
* Internal method to set an item only if token matches
*
* @param mixed $token
* @param string $normalizedKey
* @param mixed $value
* @return bool
* @see getItem()
* @see setItem()
*/
protected function internalCheckAndSetItem(&$token, &$normalizedKey, &$value)
{
if (is_int($token) && is_int($value)) {
return apc_cas($normalizedKey, $token, $value);
}
return parent::internalCheckAndSetItem($token, $normalizedKey, $value);
}
/**
* Sets a new value if a key has a certain value.
*
* Sets a new value if a key has a certain value. This function only works
* when $old and $new are longs.
*
* @param string $key Key of the value to compare and set.
* @param int $old The value to compare the key against.
* @param int $new The value to set the key to.
*
* @return bool TRUE on success, FALSE on failure.
*/
public function cas($key, $old, $new)
{
return apc_cas($this->persistentId . 'd ' . $key, $old, $new);
}
error_reporting(E_ALL);
ini_set("display_errors", 1);
echo "<pre>";
$is_apc_installed = extension_loaded('apc');
echo "[{$is_apc_installed}]" . PHP_EOL;
// Example #1 A apc_add() example
$bar = 'BAR';
apc_add('foo', $bar);
print_r(apc_fetch('foo'));
//apc_delete('foo');
echo "\n";
$bar = 'NEVER GETS SET NEW ';
apc_add('foonew', $bar);
print_r(apc_fetch('foonew'));
apc_delete('foo');
echo "\n";
apc_cas('foo', 1, 2);
print_r(apc_fetch('foo'));
print_r(apc_cache_info());
print_r(apc_bin_dump());
apc_bin_dumpfile(array(), array('foo', 'foonew'), "aa.txt");
echo "<br/>";
echo "<br/>";
echo "<br/>";
echo "<br/>";
echo "<br/>";
echo "<br/>";
echo "<br/>";
echo "<br/>";
echo "<br/>";
echo "<br/>";
<?php
/**
* (c) Liviu Balan <*****@*****.**>
* http://www.liviubalan.com/
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* apc_cas
* Updates an old value with a new value
*
* @author Liviu Balan <*****@*****.**>
* @link http://php.net/manual/en/function.apc-cas.php
* @link https://en.wikipedia.org/wiki/Compare-and-swap
*/
apc_store('foobar', 2);
echo '$foobar = 2' . '<br />';
echo '$foobar == 1 ? 2 : 1 = ', (apc_cas('foobar', 1, 2) ? 'ok' : 'fail') . '<br />';
echo '$foobar == 2 ? 1 : 2 = ', (apc_cas('foobar', 2, 1) ? 'ok' : 'fail') . '<br />';
echo '$foobar = ', apc_fetch('foobar') . '<br />';
echo '$f__bar == 1 ? 2 : 1 = ', (apc_cas('f__bar', 1, 2) ? 'ok' : 'fail') . '<br />';
apc_store('perfection', 'xyz');
echo '$perfection == 2 ? 1 : 2 = ', (apc_cas('perfection', 2, 1) ? 'ok' : 'epic fail') . '<br />';
echo '$foobar = ', apc_fetch('foobar') . '<br />';
/**
* Internal method to set an item only if token matches
*
* @param mixed $token
* @param string $normalizedKey
* @param mixed $value
* @return bool
* @see getItem()
* @see setItem()
*/
protected function internalCheckAndSetItem(&$token, &$normalizedKey, &$value)
{
return apc_cas($normalizedKey, $token, $value);
}
<?php
apc_store("ts", 12);
apc_cas("ts", 12, 15);
if (apc_fetch("ts") !== 15) {
echo "no\n";
}
apc_cas("ts", 12, 18);
if (apc_fetch("ts") !== 15) {
echo "no\n";
}
echo "ok\n";
