memcache not installed?

chef_php.rb

# attributes/default.rb

default.php.version = "5.5.15"

default.php.directives = {
  "date.timezone"                 => "Asia/Tokyo",
  "memory_limit"                  => "128M",
  "post_max_size"                 => "64M",
  "upload_max_filesize"           => "16M",
  "output_handler"                => "mb_output_handler",
  "default_charset"               => "UTF-8",
  "mbstring.language"             => "Japanese",
  "mbstring.internal_encoding"    => "UTF-8",
  "mbstring.http_input"           => "auto",
  "mbstring.http_output"          => "UTF-8",
  "mbstring.encoding_translation" => "On",
  "mbstring.detect_order"         => "auto",
  "mbstring.substitute_character" => "none",
}

# recipes/php.rb

include_recipe "php::source"

php_pear "memcache" do
  action :install
end