Returns the ReadPreference's "mode" option

# MongoDB\Driver\ReadPreference::getModeString

(mongodb >=1.7.0)

MongoDB\Driver\ReadPreference::getModeString — Returns the ReadPreference's "mode" option

### 说明

final public function MongoDB\Driver\ReadPreference::getModeString(): string

### 参数

此函数没有参数。

### 返回值

Returns the ReadPreference's "mode" option as a string.

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

### 示例

示例 #1 MongoDB\Driver\ReadPreference::getModeString() example

    <?php

    $rp = new MongoDB\Driver\ReadPreference(MongoDB\Driver\ReadPreference::PRIMARY);
    var_dump($rp->getModeString());

    $rp = new MongoDB\Driver\ReadPreference(MongoDB\Driver\ReadPreference::PRIMARY_PREFERRED);
    var_dump($rp->getModeString());

    $rp = new MongoDB\Driver\ReadPreference(MongoDB\Driver\ReadPreference::SECONDARY);
    var_dump($rp->getModeString());

    $rp = new MongoDB\Driver\ReadPreference(MongoDB\Driver\ReadPreference::SECONDARY_PREFERRED);
    var_dump($rp->getModeString());

    $rp = new MongoDB\Driver\ReadPreference(MongoDB\Driver\ReadPreference::NEAREST);
    var_dump($rp->getModeString());

    ?>

以上示例会输出：

    string(7) "primary"
    string(16) "primaryPreferred"
    string(9) "secondary"
    string(18) "secondaryPreferred"
    string(7) "nearest"

### 参见

- MongoDB\Driver\ReadPreference::getMode() - Returns the ReadPreference's "mode" option
- » Read Preference reference

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