当我添加‘&Copy；’时主题检查插件出错

我已将新设置添加到customizer.php

$wp_customize->add_setting( \'understrap_footer_text\', array(
        \'default\'           => \'Copyright &copy; 2017\' ,
        \'type\'              => \'theme_mod\',
        \'sanitize_callback\' => \'sanitize_textarea_field\',
        \'capability\'        => \'edit_theme_options\',
    ) );
        $wp_customize->add_control(
        new WP_Customize_Control(
            $wp_customize,
            \'understrap_footer_text\', array(
                \'label\'       => __( \'Footer Text\', \'understrap\' ),
                \'description\' => __( "No HTML", \'understrap\'),
                \'section\'     => \'understrap_theme_post_options\',
                \'settings\'    =>  \'understrap_footer_text\',
                \'type\'        => \'textarea\',
                \'priority\'    => \'10\',
            )
        ) );

主题检查插件错误：

REQUIRED: Found a Customizer setting that did not have a sanitization callback function. Every call to the add_setting() method needs to have a sanitization callback function passed.

当我删除时© 从add\\u setting（）的默认文本中，不会显示任何错误。

十进制代码© 也不行。

$wp_customize->add_setting( \'understrap_footer_text\', array( \'default\' => \'Copyright © 2017\' , \'type\' => \'theme_mod\', \'sanitize_callback\' => \'sanitize_textarea_field\', \'capability\' => \'edit_theme_options\', ) );

/** * [sanitize_html description] * @param [string] $input [input from textarea] * @return [string] [sanitize all input no tags] */ function sanitize_textarea_field( $input ) { return wp_strip_all_tags( $input ); }

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