# mysqlnd_qc_get_available_handlers

(PECL mysqlnd_qc >= 1.0.0)

mysqlnd_qc_get_available_handlers — Returns a list of available storage handler

### 说明

mysqlnd_qc_get_available_handlers ( void ) : array

Which storage are available depends on the compile time configuration of the query cache plugin. The default storage handler is always available. All other storage handler must be enabled explicitly when building the extension.

### 参数

此函数没有参数。

### 返回值

Returns an array of available built-in storage handler. For each storage handler the version number and version string is given.

### 范例

Example #1 mysqlnd_qc_get_available_handlers() example

    <?php
    var_dump(mysqlnd_qc_get_available_handlers());
    ?>

以上例程会输出：

    array(5) {
      ["default"]=>
      array(2) {
        ["version"]=>
        string(5) "1.0.0"
        ["version_number"]=>
        int(100000)
      }
      ["user"]=>
      array(2) {
        ["version"]=>
        string(5) "1.0.0"
        ["version_number"]=>
        int(100000)
      }
      ["APC"]=>
      array(2) {
        ["version"]=>
        string(5) "1.0.0"
        ["version_number"]=>
        int(100000)
      }
      ["MEMCACHE"]=>
      array(2) {
        ["version"]=>
        string(5) "1.0.0"
        ["version_number"]=>
        int(100000)
      }
      ["sqlite"]=>
      array(2) {
        ["version"]=>
        string(5) "1.0.0"
        ["version_number"]=>
        int(100000)
      }
    }

### 参见

- Installation
- mysqlnd_qc_set_storage_handler() - Change current storage handler