如何在创建相似的下拉列表时避免重复的代码？

Question

下面是我创建一个下拉列表中的代码，我能够从MySQL检索数据，但我必须重复每个字段的选项步骤，我如何设置代码为下拉，所以我可以缩短到在选择列表中调用它，就像在for循环中一样。如果没有选择，我如何创建错误消息以显示，并且如果我从列表中选择数据，它将存储在数据库中

<form action="sign.php" method="post"> 
<label for="employee_name">Employee name</label> 
<select name = "employee_name"> 
<option value=""> -----------Select----------- </option> 
<?php 
$stmt = $pdo->prepare('Select name from people'); 
$stmt->execute(); 
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) { 
echo '<option>'.$row['name'].'</option>'; 
} 
?> 
</select> 
<label for="manager">manager</label> 
<select name = "manager"> 
<option value=""> -----------Select----------- </option> 
<?php 
$stmt = $pdo->prepare('Select name from people'); 
$stmt->execute(); 
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) { 
echo '<option>'.$row['name'].'</option>'; 
} 
?> 
</select> 
<label for="senior">Senior</label> 
<select name = "Senior"> 
<option value=""> -----------Select----------- </option> 
<?php 
$stmt = $pdo->prepare('Select name from people'); 
$stmt->execute(); 
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) { 
echo '<option>'.$row['name'].'</option>'; 
} 
?> 
</select> 
<input type="submit" name="register" value=" Click to Add"></button> 
</form> 

Answer 1

使用数组并运行一次查询来设置数组中的选项。

<?php 
$optionArray = array(); 
$stmt = $pdo->prepare('Select name from people'); 
$stmt->execute(); 
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) { 
    $optionArray[] = '<option value="'.$row['name'].'">'.$row['name'].'</option>'; 
} 
?> 

<form action="sign.php" method="post"> 
<label for="employee_name">Employee name</label> 
<select name = "employee_name"> 
<option value=""> -----------Select----------- </option> 
<?php 
foreach($optionArray as $row) 
{ 
    echo $row; 
} 
?> 
</select> 

Answer 2

而不是每次创建一个执行相同任务的方法时重复此操作。

<label for="employee_name">Employee name</label> 
<select name = "employee_name"> 
<option value=""> -----------Select----------- </option> 
    <?=loadOptions('name','people');?> <!--shortcut way to echo in php--> 
</select> 

<?php 
function loadOptions($field,$table){ 
    $stmt = $pdo->prepare('Select '.$field.' from '.$table); 
    $stmt->execute(); 
    $options=''; 
    while($row = $stmt->fetch(PDO::FETCH_ASSOC)) { 
     $options .= '<option>'.$row['name'].'</option>'; 
    } 
    return $options; 
} 
?>