Search for the previous absent index in the Judy array

# Judy::prevEmpty

(PECL judy >= 0.1.1)

Judy::prevEmpty — Search for the previous absent index in the Judy array

### 説明

public Judy::prevEmpty ( mixed `$index` ) : int

Search (exclusive) for the previous index absent that is less than the passed Index.

### パラメータ

`index`

  The index can be an integer or a string corresponding to the index where to start the search.

### 返り値

Return the corresponding index in the array.