## 例

`

     bool readline_callback_handler_install ( string $prompt , callback $callback )

`

## 説明

Sets up a readline callback interface then prints prompt and immediately returns. Calling this function twice without removing the previous callback interface will automatically and conveniently overwrite the old interface. The callback feature is useful when combined with stream_select() as it allows interleaving of IO and user input, unlike readline().

## 戻り値

Returns TRUE on success or FALSE on failure.