PHP引導多選擇選項

Question

在我的代碼我使用PHP從MySQL數據庫填充引導多selectpicker數據庫，但問題是它只選擇最後一個選項，而不是多個選項，我不知道我缺少什麼？這裏是我的我的代碼

function MultiBindCombo($tablenames, $columnnames1, $columnnames2, $comboname, $selectedopt) { 
    global $conn; 
    $sql="SELECT ". $columnnames1. ", " . $columnnames2 . " FROM ". $tablenames; 
    $result = mysqli_query($conn, $sql); 
    if(! $result) { 
     echo mysql_error(); 
     exit; 
    } 
    echo '<select class="selectpicker form-control" data-live-search="true" name="' . $comboname . '" multiple="multiple">'; 
    $array = explode(',', $selectedopt); 
    while ($row=mysqli_fetch_array($result)) { 
      foreach ($array as $select_option){ 
      if($row[$columnnames1] == $select_option) { 
       $print_selected = 'selected'; 
      } else { 
       $print_selected = ''; 
      } 
      echo $select_option; 
      } 
     echo '<option data-tokens="' . $row[$columnnames1] . '" value="' . $row[$columnnames1] . '"' .$print_selected. '>' . $row[$columnnames2] . '</option>'; 
    } 
    echo '</select>'; 
} 

Answer 1

要獲得所有選擇值在您需要使用name屬性與[]一個多選：

echo '<select class="selectpicker form-control" data-live-search="true" name="' . $comboname . '[]" multiple="multiple">'; 

之後，你可以重複使用foreach超過$_POST[$comboname]。

更新：

讓我們來看看更接近你的代碼在這裏：

while ($row=mysqli_fetch_array($result)) { 
    foreach ($array as $select_option){ 

     // You iterate over every value of array, so in the end 
     // `$print_selected` is defined depending on value of the 
     // last `$select_option` 

     if($row[$columnnames1] == $select_option) { 
      $print_selected = 'selected'; 
     } else { 
      $print_selected = ''; 
     } 

     // remove this. Why you echo `$select_option`? 
     echo $select_option; 
    } 
    echo '<option data-tokens="' . $row[$columnnames1] . '" value="' . $row[$columnnames1] . '"' .$print_selected. '>' . $row[$columnnames2] . '</option>'; 
} 

重寫爲：

while ($row=mysqli_fetch_array($result)) { 
    $print_selected = ''; 
    foreach ($array as $select_option){ 
     if($row[$columnnames1] == $select_option) { 
      $print_selected = 'selected'; 

      // break `foreach` as you found the right item 
      break; 
     } 
    } 
    // if right item is not found - `$print_selected` is empty 

    echo '<option data-tokens="' . $row[$columnnames1] . '" value="' . $row[$columnnames1] . '"' .$print_selected. '>' . $row[$columnnames2] . '</option>'; 
}