/**
* Select from storage via callback function
* @param callback $fx ($value, $key) - should return true to select key(s)
* @param bool $get_array
* @return mixed
*/
public function select_fx($fx, $get_array = false)
{
$arr = array();
$prefix_length = strlen($this->prefix);
$keys = $this->redis->Keys($this->prefix . '*');
foreach ($keys as $key) {
$content = $this->redis->Get($key);
if (empty($content)) {
continue;
}
$value = unserialize($content);
$index = substr($key, $prefix_length);
if ($fx($value, $index) === true) {
if (!$get_array) {
return $value;
} else {
$arr[$index] = $value;
}
}
}
if (!$get_array || empty($arr)) {
return false;
} else {
return $arr;
}
}
/**
* Increment value of the key
* @param string $key
* @param mixed $by_value
* if stored value is an array:
* if $by_value is a value in array, new element will be pushed to the end of array,
* if $by_value is a key=>value array, new key=>value pair will be added (or updated)
* @param int $limit_keys_count - maximum count of elements (used only if stored value is array)
* @param int $ttl - set time to live for key
* @return int|string|array new value of key
*/
public function increment($key, $by_value = 1, $limit_keys_count = 0, $ttl = 259200)
{
if (empty($key)) {
$this->ReportError('empty keys are not allowed', __LINE__);
return false;
}
if (is_numeric($by_value) && !$this->redis->Exists($this->serialize_key_prefix . $key)) {
if (!($key_exists = $this->redis->Exists($this->prefix . $key)) || is_numeric($this->redis->Get($this->prefix . $key))) {
if ($by_value >= 0) {
$result = $this->redis->IncrBy($this->prefix . $key, $by_value);
} else {
$result = $this->redis->DecrBy($this->prefix . $key, $by_value * -1);
}
if ($result !== false) {
if ($ttl > 0) {
$this->redis->Expire($this->prefix . $key, $ttl);
}
return $result;
}
}
}
if (!$this->acquire_key($key, $auto_unlocker)) {
return false;
}
$value = $this->read($key);
if ($value === null || $value === false) {
return $this->save($key, $by_value, $ttl);
}
if (is_array($value)) {
$value = $this->incrementArray($limit_keys_count, $value, $by_value);
} elseif (is_numeric($value) && is_numeric($by_value)) {
$value += $by_value;
} else {
$value .= $by_value;
}
if ($this->save($key, $value, $ttl)) {
return $value;
} else {
return false;
}
}
