<form method="POST">
<select name="timeslot[]" multiple="multiple" size = 4 required>
    <option value="1">1</option>
    <option value="1">1</option>
    <option value="1">1</option>
</select>
<input type="submit" name="submit"/>
</form>

<?php
if(isset($_POST[\'submit\'])){
    global $wpdb;
    $booking_timeslots = $wpdb->prefix . \'booking_timeslots\';   
    $timeslots = $_POST[\'timeslot\'];
       foreach ($timeslots as $time) {
          echo $dd = $time[\'timeslot\'];
       }
}
?>

这是我的查询完整代码。

<?php
if(isset($_POST[\'submit\'])){
    global $wpdb;
    $booking_dates = $wpdb->prefix . \'booking_dates\';   //\'booking_dates\' is a table name which is in the database
    $booking_timeslots = $wpdb->prefix . \'booking_timeslots\';   //\'booking_timeslots\' is a table name which is in the database

    $year = $_POST[\'year\'];
    $month = $_POST[\'month\'];
    $days = $_POST[\'days\'];
    $timeslots = $_POST[\'timeslot\'];

        $data[\'year\'] = $year;      // $data[\'year\'] year is a name of column in database
        $data[\'month\'] = $month;
    foreach ($days as $day) {           // $data[\'month\'] month is a name of column in database
        $data[\'day\'] = $day;            // $data[\'day\'] day is a name of column in database

        $wpdb->insert($booking_dates,$data);
        $last_record_id = $wpdb->insert_id;

        foreach ($timeslots as $timeslot) {
            $data_timeslot[\'bid\'] = $last_record_id;
            $data_timeslot[\'time\'] = $timeslot;
            $wpdb->insert($booking_timeslots,$data_timeslot);
        }
    }
}
?>

当上述代码执行时，wordpress给出以下错误。

Illegal string offset \'timeslot\' 

有人能帮忙解决这个问题吗。

<form method="POST">
   <select name="timeslot[]" multiple="multiple" size = 4 required>
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
   </select>
   <input type="submit" name="submit"/>
</form>

<?php
if(isset($_POST[\'submit\'])){
    global $wpdb;
    $booking_timeslots = $wpdb->prefix . \'booking_timeslots\';   
    $timeslots = $_POST[\'timeslot\'];
    // you can use print_r() here 
    print_r( $timeslots );  // to see what is submitted from form

    foreach ($timeslots as $time) {
          echo $time;
    }
}
?>