php - 使用 php 给下拉列表一个默认值

Question

我想用 php/mysql 查询给下拉列表一个默认值

就像在数据库用户表中有一条记录说用户组

我想要它，所以下拉默认值更改为该记录的值我到目前为止得到了这段代码:

Usergroup: <select value=\"" . $usergroup . "\" name='usergroup'>
<option value='4'>Administrator</option>
<option value='3'>Moderator</option>
<option value='2'>Donator</option>
<option value='1'>Regular Member</option>
</select>

和php部分:

 $username = mysql_real_escape_string(htmlentities(stripslashes($_POST['username'])));
  $query="SELECT * FROM users where `username` like '{$username}'";
$result = mysql_query($query);

$num = mysql_numrows($result);

$i=0;
while ($i < $num) {
$username2=mysql_result($result,$i,"username");
$name=mysql_result($result,$i,"name");
$usergroup=mysql_result($result,$i,"usergroup");
$email=mysql_result($result,$i,"email");
$ip=mysql_result($result,$i,"ip");
$profpic=mysql_result($result,$i,"profilepic");
$id=mysql_result($result,$i,"id");
$i++;
} 

谢谢您的问候!

我让它与一些 if 语句一起工作，我打算那样使用它，但不希望代码变得太乱:

if ($usergroup == 4) {
echo "<select name='usergroup'><option value='4' selected='selected'>Administrator</option><option value='3'>Moderator</option><option value='2'>Donator</option><option value='1'>Regulat Member</option></select><br>";
}
if ($usergroup == 3) {
echo "<select name='usergroup'><option value='4'>Administrator</option><option value='3' selected='selected'>Moderator</option><option value='2'>Donator</option><option value='1'>Regulat Member</option></select><br>";
}
if ($usergroup == 2) {
echo "<select name='usergroup'><option value='4'>Administrator</option><option value='3'>Moderator</option><option value='2' selected='selected'>Donator</option><option value='1'>Regulat Member</option></select><br>";
}
if ($usergroup == 1) {
echo "<select name='usergroup'><option value='4'>Administrator</option><option value='3'>Moderator</option><option value='2'>Donator</option><option value='1' selected='selected'>Regulat Member</option></select><br>";
}

Answer 1

这可能是您正在寻找的:

<?php
  // $userGroup = the value from the database
  $userGroup = 4;
?>

<select>
  <option <?php echo ($userGroup) == 1 ? "selected" : "" ?> value="1">Administrator</option>
  <option <?php echo ($userGroup) == 2 ? "selected" : "" ?> value="2">Moderator</option>
  <option <?php echo ($userGroup) == 3 ? "selected" : "" ?> value="3">Donator</option>
  <option <?php echo ($userGroup) == 4 ? "selected" : "" ?> value="4">Regular member</option>
</select>

如果您不认识 if/else 语法(速记)，check out this guide .对于这种情况真的很方便。