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Prepends the specified value to a list, only if the key already exists and if it holds a list.

[Redis documentation]

lpushx(key, value, [options], [callback])

Arguments Type Description
key string Key identifier
value array Value to add at the beginning of the list
options JSON Object Optional parameters
callback function Callback


Option Type Description Default
queuable boolean Make this request queuable or not true

Return Value

Returns the MemoryStorage object to allow chaining.

Callback Response

Returns an integer containing the updated number of items in the list.


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use \Kuzzle\Kuzzle;
$kuzzle = new Kuzzle('localhost');
try {
  $count = $kuzzle->memoryStorage()->lpushx('key', 'foo');
catch (ErrorException $e) {

Callback response:

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