如何在創建相似的下拉列表時避免重複的代碼？

Question

下面是我創建一個下拉列表中的代碼，我能夠從MySQL檢索數據，但我必須重複每個字段的選項步驟，我如何設置代碼爲下拉，所以我可以縮短到在選擇列表中調用它，就像在for循環中一樣。如果沒有選擇，我如何創建錯誤消息以顯示，並且如果我從列表中選擇數據，它將存儲在數據庫中

<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

使用數組並運行一次查詢來設置數組中的選項。

<?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

而不是每次創建一個執行相同任務的方法時重複此操作。

<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; 
} 
?>