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vendor/yiisoft/yii2/db/PdoValueBuilder.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db;
+
+/**
+ * Class PdoValueBuilder builds object of the [[PdoValue]] expression class.
+ *
+ * @author Dmytro Naumenko <d.naumenko.a@gmail.com>
+ * @since 2.0.14
+ */
+class PdoValueBuilder implements ExpressionBuilderInterface
+{
+    const PARAM_PREFIX = ':pv';
+
+
+    /**
+     * {@inheritdoc}
+     */
+    public function build(ExpressionInterface $expression, array &$params = [])
+    {
+        $placeholder = static::PARAM_PREFIX . count($params);
+        $params[$placeholder] = $expression;
+
+        return $placeholder;
+    }
+}