我有一些自定义帖子，如果存在元键值，我会尝试获取数据。我有一个Html表单，我正试图在到达和离开时间前取邮件。这是我的表格。

 <form action="" method="POST">
                <div class="row">
                    <div class="form-group col-sm-3 col-md-2" id="bgform_text2">
                        <h4>SEARCH</h4>
                        <p>For Your Favourite Place</p>
                    </div>
                    <div class="form-group col-sm-5 col-md-2">
                        <label>Where to ? </label>
                        <input  type="text" name="names" class="input-text full-width" placeholder="start typing here....">
                    </div>
                    <div class="form-group col-sm-5 col-md-4">
                        <div class="row">
                            <div class="col-xs-6">
                                <label>Arrive </label>
                                <div class="controls">
                                    <input type="text" name="arive_time" id="departing">
                                </div>
                            </div>
                            <div class="col-xs-6">
                                <label>Departs </label>
                                <div class="controls">
                                    <input type="text" name="depart_time" id="returning">
                                </div>
                            </div>
                        </div>
                    </div>
                    <div class="form-group col-sm-9 col-md-2">
                        <label>Sleeps </label>
                        <div class="controls">
                            <i class="fa fa-sort"></i>
                                                        <select name="sleep">
                          <option value="" disabled="" selected=""></option>
                          <option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option></option>
                        </select>

                      </div> 

                    </div>
                    <div class="form-group col-sm-3 col-md-2">
                        <input type="submit" value="submit" name="submit_btn" class="button">
                    </div>
                </div>
            </form>
        </div>
    </div>

这是我的php代码。问题是，我太困惑了，我如何才能通过元键值获取帖子。提交表单时。

 <?php

                $args = array(
                \'post_type\'         => \'mad_property\',
                 \'post_status\'       => \'publish\',
                 \'paged\'             => \'-1\',   
            // \'meta_query\'        => $meta_query,
        );



        $prop_selection = new WP_Query($args);
        if( $prop_selection->have_posts() ){
            $count=0;               
            while ($prop_selection->have_posts()): $prop_selection->the_post(); 
                $count++;
                if($count > 9){
                    print \'<div class="property_search_hidden" style="display:none;opacity:0;">\';
                }
                // if( wpestate_check_booking_valability($book_from,$book_to,$post->ID) ){
                    get_template_part(\'templates/property_unit\');
                if($count > 3){
                    print \'</div>\';
                }
            endwhile;
            wp_reset_query();
            $s=\'\';
            if($count > 1){
                $s = \'s\';
            }
            print \'<div class="search_notice"><h3>We found \'.$count.\' item\'.$s.\' for you!</h3></div>\';
            if($count > 3){                 
                print \'<div class="col-md-12 show_more_saps"><button onclick="show_hidden_property();" class="btn btn-large btn-saps">Show all \'.$count.\' property were found</button></div>\';
            }
        }else{
            print \'<span class="no_results">\'. esc_html__( "We didn\'t find any results","wpestate").\'</span>\';
        }
        ?>

$args = array(
    \'post_type\'  => \'product\',
    \'meta_query\' => array(
        \'relation\' => \'OR\',
        array(
            \'key\'     => \'color\',
            \'value\'   => \'blue\',
            \'compare\' => \'NOT LIKE\',
        ),
        array(
            \'key\'     => \'price\',
            \'value\'   => array( 20, 100 ),
            \'type\'    => \'numeric\',
            \'compare\' => \'BETWEEN\',
        ),
    ),
);
$query = new WP_Query( $args );