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vendor/yiisoft/yii2/web/JsExpression.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\web;
+
+use yii\base\BaseObject;
+
+/**
+ * JsExpression marks a string as a JavaScript expression.
+ *
+ * When using [[\yii\helpers\Json::encode()]] or [[\yii\helpers\Json::htmlEncode()]] to encode a value, JsonExpression objects
+ * will be specially handled and encoded as a JavaScript expression instead of a string.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class JsExpression extends BaseObject
+{
+    /**
+     * @var string the JavaScript expression represented by this object
+     */
+    public $expression;
+
+
+    /**
+     * Constructor.
+     * @param string $expression the JavaScript expression represented by this object
+     * @param array $config additional configurations for this object
+     */
+    public function __construct($expression, $config = [])
+    {
+        $this->expression = $expression;
+        parent::__construct($config);
+    }
+
+    /**
+     * The PHP magic function converting an object into a string.
+     * @return string the JavaScript expression.
+     */
+    public function __toString()
+    {
+        return $this->expression;
+    }
+}