使用 php 从 db 循环填充 multi-select

Question

以下内容适用于本地环境。既然推了生活的一切，但这些似乎工作。现在显示完全空的 select 框，在 "select options" 下拉列表中没有检查或空白标签只是空的 space。 select display

<?php
  $selected = array();
  $selected = explode(",",$fill['markets']);

  $condb = mysql_query("SELECT * FROM `countries`");
  $count = mysql_num_rows($condb);
  $countries = array();
  $str;

  while ($countries = mysql_fetch_array($condb))
  {
    $str = "option{$countries['id']}";
    echo "<option value='{$str}' ";
    if(in_array($str,$selected)) {
      echo "selected>";
      echo $countries['country'];
      echo "</option>";
    } else {
      echo ">";
      echo $countries['country'];
      echo "</option>";
    }
  }      
  ?>

Answer 1

您应该改用 while 循环。如果需要可以在循环外声明$i，试试下面的代码：

  $condb = mysql_query("SELECT * FROM `countries`");

  $i = 0;
   while($countries = mysql_fetch_array($condb)) {
    $str = 'option' . $i;
    echo "<option value='{$str}' ";
    if(in_array($str,$selected)) {
      echo "selected>";
      echo $countries['country'];
      echo "</option>";
    } else {
      echo ">";
      echo $countries['country'];
      echo "</option>";
    }
 $i++;
  }
  ?>
</select>

注：

mysql_* 自 php-5.5 起已弃用。所以改用 mysqli_* 或 PDO.
Why shouldn't I use mysql_* functions in PHP?

使用 php 从 db 循环填充 multi-select

Populate multi-select with php while loop from db

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