问题描述
如何让
How to make <option selected="selected"> set by MySQL and PHP?
我的代码:
echo '<select>'; $tempholder = array(); $rs = mysql_query("SELECT * FROM id ORDER BY year"); $nr = mysql_num_rows($rs); for ($i=0; $i<$nr; $i++){ $r = mysql_fetch_array($rs); //if($year==$r["year"]){ $selected=' selected="selected"'; }//doesn't work so if (!in_array($r['year'], $tempholder)){ $tempholder[$i] = $r['year']; echo "<option>".$r["year"]."</option>";//<option$selected>... } } unset($tempholder); echo '</select>';
推荐答案
除了修复 =/== 问题之外,您还可以省去数组查找和通过要求数据库在查询中每年只返回一次,使代码更简单:
In addition to fixing the =/== gotcha, you can save yourself the array lookup and make the code simpler by asking the database to return each year only once in the query:
<select> <?php $result= mysql_query('SELECT DISTINCT year FROM id ORDER BY year'); ?> <?php while($row= mysql_fetch_assoc($result)) { ?> <option <?php if ($row['year']==$year) { ?>selected="selected"<?php } ?>> <?php echo htmlspecialchars($row['year']); ?> </option> <?php } ?> </select>
(您可能不需要 htmlspecialchars() 假设这是一个数字年份,但总是对 HTML 模板中包含的任何纯文本进行 HTML 转义是一种很好的做法.您可以使用较短的名称来执行 echo htmlspecialchars 以减少打字.)
(You may not need htmlspecialchars() assuming that's a numeric year, but it's good practice always to HTML-escape any plain text you include in an HTML template. You can define a function with a shorter name to do the echo htmlspecialchars to cut down on typing. )