Php 将动态HTML选项的第一个值设置为空 挑选

试试这个

<select id="section" name="section">
    <?php
    include("Nethost.php");
    $section = "";
    $yr = "";
    $sql = mysql_query("SELECT DISTINCT * FROM section ORDER BY yrlvl, section");
    while ($row = mysql_fetch_array($sql)){
        $section = $row['section'];
        $yr = $row['yrlvl'];
        ?>
        <option value="">Select</option>
        <option <?php $result2 = mysql_query("SELECT section FROM student WHERE idnumber = '$idnumber'");
        if(mysql_num_rows($result2) > 0) { ?>
            selected="selected" <?php } ?> value="<?php print $section; ?>"><?php print $yr; ?> - <?php print $section; ?></option>
    <?php } ?>
</select>

挑选
试试这个

<select id="section" name="section">
    <?php
    include("Nethost.php");
    $section = "";
    $yr = "";
    $sql = mysql_query("SELECT DISTINCT * FROM section ORDER BY yrlvl, section");
    while ($row = mysql_fetch_array($sql)){
        $section = $row['section'];
        $yr = $row['yrlvl'];
        ?>
        <option value="">Select</option>
        <option <?php $result2 = mysql_query("SELECT section FROM student WHERE idnumber = '$idnumber'");
        if(mysql_num_rows($result2) > 0) { ?>
            selected="selected" <?php } ?> value="<?php print $section; ?>"><?php print $yr; ?> - <?php print $section; ?></option>
    <?php } ?>
</select>


挑选
试试这个

<select id="section" name="section">
    <?php
    include("Nethost.php");
    $section = "";
    $yr = "";
    $sql = mysql_query("SELECT DISTINCT * FROM section ORDER BY yrlvl, section");
    while ($row = mysql_fetch_array($sql)){
        $section = $row['section'];
        $yr = $row['yrlvl'];
        ?>
        <option value="">Select</option>
        <option <?php $result2 = mysql_query("SELECT section FROM student WHERE idnumber = '$idnumber'");
        if(mysql_num_rows($result2) > 0) { ?>
            selected="selected" <?php } ?> value="<?php print $section; ?>"><?php print $yr; ?> - <?php print $section; ?></option>
    <?php } ?>
</select>


挑选
试试这个

<select id="section" name="section">
    <?php
    include("Nethost.php");
    $section = "";
    $yr = "";
    $sql = mysql_query("SELECT DISTINCT * FROM section ORDER BY yrlvl, section");
    while ($row = mysql_fetch_array($sql)){
        $section = $row['section'];
        $yr = $row['yrlvl'];
        ?>
        <option value="">Select</option>
        <option <?php $result2 = mysql_query("SELECT section FROM student WHERE idnumber = '$idnumber'");
        if(mysql_num_rows($result2) > 0) { ?>
            selected="selected" <?php } ?> value="<?php print $section; ?>"><?php print $yr; ?> - <?php print $section; ?></option>
    <?php } ?>
</select>


挑选
只需将选项行“Select”移出php代码：

<select id="section" name="section">
    <?php
    include("Nethost.php");
    $section = "";
    $yr = "";
    $sql = mysql_query("SELECT DISTINCT * FROM section ORDER BY yrlvl, section");
    ?>
    <option value="">Select</option>
    <?php
    while ($row = mysql_fetch_array($sql)){
        $section = $row['section'];
        $yr = $row['yrlvl'];
        ?>

        <option <?php $result2 = mysql_query("SELECT section FROM student WHERE idnumber = '$idnumber'");
        if(mysql_num_rows($result2) > 0) { ?>
            selected="selected" <?php } ?> value="<?php print $section; ?>"><?php print $yr; ?> - <?php print $section; ?></option>
    <?php } ?>
</select>


挑选
只需将选项行“选择”从php代码中移出：

<select id="section" name="section">
    <?php
    include("Nethost.php");
    $section = "";
    $yr = "";
    $sql = mysql_query("SELECT DISTINCT * FROM section ORDER BY yrlvl, section");
    ?>
    <option value="">Select</option>
    <?php
    while ($row = mysql_fetch_array($sql)){
        $section = $row['section'];
        $yr = $row['yrlvl'];
        ?>

        <option <?php $result2 = mysql_query("SELECT section FROM student WHERE idnumber = '$idnumber'");
        if(mysql_num_rows($result2) > 0) { ?>
            selected="selected" <?php } ?> value="<?php print $section; ?>"><?php print $yr; ?> - <?php print $section; ?></option>
    <?php } ?>
</select>


挑选
只需将选项行“选择”从php代码中移出：

<select id="section" name="section">
    <?php
    include("Nethost.php");
    $section = "";
    $yr = "";
    $sql = mysql_query("SELECT DISTINCT * FROM section ORDER BY yrlvl, section");
    ?>
    <option value="">Select</option>
    <?php
    while ($row = mysql_fetch_array($sql)){
        $section = $row['section'];
        $yr = $row['yrlvl'];
        ?>

        <option <?php $result2 = mysql_query("SELECT section FROM student WHERE idnumber = '$idnumber'");
        if(mysql_num_rows($result2) > 0) { ?>
            selected="selected" <?php } ?> value="<?php print $section; ?>"><?php print $yr; ?> - <?php print $section; ?></option>
    <?php } ?>
</select>


挑选
只需将选项行“选择”从php代码中移出：

<select id="section" name="section">
    <?php
    include("Nethost.php");
    $section = "";
    $yr = "";
    $sql = mysql_query("SELECT DISTINCT * FROM section ORDER BY yrlvl, section");
    ?>
    <option value="">Select</option>
    <?php
    while ($row = mysql_fetch_array($sql)){
        $section = $row['section'];
        $yr = $row['yrlvl'];
        ?>

        <option <?php $result2 = mysql_query("SELECT section FROM student WHERE idnumber = '$idnumber'");
        if(mysql_num_rows($result2) > 0) { ?>
            selected="selected" <?php } ?> value="<?php print $section; ?>"><?php print $yr; ?> - <?php print $section; ?></option>
    <?php } ?>
</select>


挑选
Aw。只是把它放在while循环之外。谢谢。：）是的，如果这解决了您的问题，请记住将答案标记为“是”。我还有一分钟的时间把它标记为答案。谢谢你。只是把它放在while循环之外。谢谢。：）是的，如果这解决了您的问题，请记住将答案标记为“是”。我还有一分钟的时间把它标记为答案。谢谢你。只是把它放在while循环之外。谢谢。：）是的，如果这解决了您的问题，请记住将答案标记为“是”。我还有一分钟的时间把它标记为答案。谢谢你。只是把它放在while循环之外。谢谢。：）是的，如果这解决了您的问题，请记住将答案标记为“是”。我还有一分钟的时间把它标记为答案。非常感谢。