试试这个。这是一个过滤搜索查询并用其“哑”等价物替换任何智能引号的函数。

<?php

/**
 * Filter smart quotes out of a search query.
 * Replace them with "dumb" quotes.
 *
 * @param WP_Query $query Instance of WP_Query.
 */
function filter_search_smart_quotes( $query ) {
    if ( $query->is_search() ) {
        $search = $query->get( \'s\' );

        $smart_quotes = array(
            chr( 145 ),
            chr( 146 ),
            chr( 147 ),
            chr( 148 ),
            chr( 151 ),
        );

        $dumb_quotes = array(
            "\'",
            "\'",
            \'"\',
            \'"\',
            \'-\',
        );

        $search = str_replace( $smart_quotes, $dumb_quotes, $search );

        $query->set( \'s\', $search );
    }
}
add_action( \'pre_get_posts\', \'filter_search_smart_quotes\' );