函数无法使用表单元素 - Function not working with form element

Function not working with form element

本文关键字：表单元素函数 | 更新日期: 2023-09-27

请对我温柔一点，我只是个新手。请告诉我这个功能不起作用的原因。没有错误，只是空白页。

<?php 
include("db.php");
$id = (integer)$_GET['id'];
echo $id;
function updateshowdata($stmt, $con){
$stmt = $con->prepare("SELECT `firstname` FROM `MyGuests` where id =?");
$stmt->bind_param ('i',$id);
$stmt->execute ();
$stmt->bind_result ($firstname);

$updateshow = "<form method='post' action='updateprocess.php'>";
while ($stmt->fetch()) {
$updateshow .= "<input type='text' name='firstname'  value='{$firstname}' >";
}
$updateshow .= "</form>";
echo $updateshow;
}
updateshowdata($stmt, $con);
?>

如果我把它改成下面的删除功能，它就开始工作了

<?php 
include("db.php");
$id = (integer)$_GET['id'];
echo $id;
$stmt = $con->prepare("SELECT `firstname` FROM `MyGuests` where id =?");
$stmt->bind_param ('i',$id);
$stmt->execute ();
$stmt->bind_result ($firstname);

$updateshow = "<form method='post' action='updateprocess.php'>";
while ($stmt->fetch()) {
$updateshow .= "<input type='text' name='firstname'  value='{$firstname}' >";
}
$updateshow .= "</form>";
echo $updateshow;

?>

它能工作吗？

function updateshowdata($stmt, $con){
    $id = (int)$GET['id'];
    $stmt = $con->prepare("SELECT `firstname` FROM `MyGuests` where id =?");
    $stmt->bind_param ('i',$id);
    $stmt->execute ();
    $stmt->bind_result ($firstname);    

    $updateshow = "<form method='post' action='updateprocess.php'>";
    while ($stmt->fetch()) {
        $updateshow .= "<input type='text' name='firstname'      value='{$firstname}' >";
}