Php 当用户尝试更新时，如何更新图像？
editform.phpPhp 当用户尝试更新时，如何更新图像？,php,html,mysqli,Php,Html,Mysqli,editform.php <?php session_start(); if (!isset($_SESSION['id'])) { header('location:login.php'); } ?> <?php $nameErr = $emailErr = $usernameErr = $DateOfBirthErr = $departmentErr = $
<?php
session_start();
if (!isset($_SESSION['id'])) {
header('location:login.php');
}
?>
<?php
$nameErr = $emailErr = $usernameErr = $DateOfBirthErr = $departmentErr = $ageErr = $fileToUploadErr = $fileToUploadErrr = $fileToUploadErrrr = $fileToUploadErrrrr = $fileToUploadErrrrrr = "";
$name = $email = $username = $DateOfBirth = $department = $age = $filename = "";
include_once 'connect.php';
$id = $_GET['id'];
$query = mysqli_query($mysqli, "select * from `users` where userid ='$id'");
$row = mysqli_fetch_array($query);
//set a default variable to hold the original value if $_POST is not triggered
$name = $row['name'];
$username = $row['username'];
$email = $row['email'];
$DateOfBirth = $row['Date_of_birth'];
$department = $row['department'];
$age = $row['age'];
// $filename = $_FILES['filename']['name'];
echo "<img alt='image' style='width:180px;height:100px;' src='upload/" . $row['filename'] . "'>";
// checking weather the form has been submitted before performing the update query
if (isset($_POST['update'])) {
//Name Section
if (empty($_POST["name"])) {
$nameErr = "Name is required";
} else {
$name = $_POST["name"];
// check if name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/", $name)) {
$nameErr = "Only letters and white space allowed";
}
}
//E-mail Section
if (empty($_POST["email"])) {
$emailErr = "Email is required";
} else {
$email = $_POST["email"];
// check if e-mail address is well-formed
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$emailErr = "Invalid email format";
}
}
//Username Section
if (empty($_POST["username"])) {
$usernameErr = "Username is required";
} else {
$username = $_POST["username"];
// check if name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/", $username)) {
$usernameErr = "Only letters and white space allowed";
}
}
//D.O.B Section
if (empty($_POST["Date_of_birth"])) {
$DateOfBirthErr = "Date Of Birth is required";
} else {
$DateOfBirth = $_POST["Date_of_birth"];
}
//Department Section
if (empty($_POST["department"])) {
$departmentErr = "Department is required";
} else {
$department = $_POST["department"];
}
//Age Section
if (empty($_POST["age"])) {
$ageErr = "Age is required";
} else {
$age = $_POST["age"];
}
//UPLOAD FILE
$uploaddir = 'upload/';
$uploadfile = $uploaddir . basename($_FILES['filename']['name']);
$imageFileType = pathinfo($uploadfile, PATHINFO_EXTENSION);
if ($_FILES['filename']['name'] != '') {
// Check the image is actaully image or not
$check = getimagesize($_FILES["filename"]["tmp_name"]);
if ($check == false) {
$fileToUploadErrrrr = "File is not an image.";
}
// Check if file already exists
if (file_exists($uploadfile)) {
$fileToUploadErrrrrr = "Sorry, file already exists.";
}
if ($imageFileType != "jpg" && $imageFileType != "png") {
$fileToUploadErr = "Sorry, only JPG,PNG files are allowed.";
} elseif ($_FILES['filename']['size'] > 500000) {
$fileToUploadErrrr = "Sorry, your file is too large.";
} else {
/* if ($filename != '') {
$target = "upload/" . $filename;
unlink($target);
}*/
$uploaded = move_uploaded_file($_FILES['filename']['tmp_name'], $uploadfile);
if ($uploaded) {
$file = $_FILES['filename']['name'];
} else {
$file = $filename;
}
}
} else {
$file = $filename;
}
if ($nameErr == "" && $emailErr == "" && $usernameErr == "" && $DateOfBirthErr == "" && $departmentErr == "" && $ageErr == "" && $fileToUploadErr == "" && $fileToUploadErrr == "" && $fileToUploadErrrr == "" && $fileToUploadErrrrr == "" && $fileToUploadErrrrrr == "") {
$check = "SELECT * FROM users WHERE username = '$username' and userid !='$id'";
$rs = mysqli_query($mysqli, $check);
$da = mysqli_fetch_array($rs, MYSQLI_NUM);
if ($da > 0) {
echo "Username Already in Exists";
} else {
if($file=="")
{
$sql = "update `users` set name='$name', username='$username', email='$email', Date_of_birth='$DateOfBirth', department='$department', age='$age' where userid ='$id'";
if (mysqli_query($mysqli, $sql)) {
echo "Record updated successfully";
} else {
echo "Error updating record: " . mysqli_error(mysqli_query);
}
mysqli_close($mysqli);
}
else{
$sql = "update `users` set name='$name', username='$username', email='$email', Date_of_birth='$DateOfBirth', department='$department', age='$age' , filename='$file' where userid ='$id'";
if (mysqli_query($mysqli, $sql)) {
echo "Record updated successfully";
} else {
echo "Error updating record: " . mysqli_error(mysqli_query);
}
mysqli_close($mysqli);
}
}
}
}
?>
<!DOCTYPE html>
<html>
<head>
<style>
.error {
color:red;
}
.button {
background-color: #4CAF50;
border: none;
color: white;
padding: 10px 25px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
}
.div1 {
background-color: #f2f2f2;
margin-top: -19px;
margin-bottom: -25px;
margin-left: -19px;
}
.copy {
border-radius: 4px;
padding: 6px 20px;
border-style: ridge;
}
.copy1{
border-radius: 4px;
padding: 6px 28px;
border-style: ridge;
}
.copy2{
border-radius: 4px;
padding: 4px 2px;
}
</style>
</head>
<body>
<div style="padding-left: 250px" class="div1">
<h2 style="color:#009999">EDIT :</h2>
<form method="POST" action="" enctype="multipart/form-data">
<input type="hidden" name="hidden_id" value="<?= $id ?>"/>
<label style="color:#0099ff">Name:</label><input class= "copy" style="margin-left: 52px" type="text" value="<?= $name ?>" name="name">
<span class="error"> <?php echo $nameErr; ?></span>
<br><br>
<label style="color:#0099ff">Username:</label><input type="text" class= "copy" style="margin-left:26px" value="<?= $username ?>" name="username">
<span class="error"><?php echo $usernameErr; ?></span>
<br><br>
<label style="color:#0099ff">E-mail:</label><input type="text" class= "copy" style="margin-left: 48px" value="<?= $email ?>" name="email">
<span class="error"><?php echo $emailErr; ?></span>
<br><br>
<label style="color:#0099ff">Date_of_birth: </label><input type="date" class= "copy1" value="<?= $DateOfBirth ?>" name="Date_of_birth">
<span class="error"> <?php echo $DateOfBirthErr; ?></span>
<br><br>
<label style="color:#0099ff">Department:</label>
<select name="department" class= "copy2" style="margin-left:14px" value="<?= $department ?>">
<option value="EE">Electrical & Electronics</option>
<option value="EC">Electronics & Communication</option>
<option value="ME">Mechanical</option>
<option value="CS">Computer Science</option>
<option value="CV">Civil</option>
<option value="IS">Information Science</option>
</select>
<span class="error"> <?php echo $departmentErr; ?></span>
<br><br>
<label style="color:#0099ff">Age:</label><input type="text" class= "copy" style="margin-left:62px" value="<?= $age ?>" name="age">
<span class="error"> <?php echo $ageErr; ?></span>
<br><br>
<label style="color:#0099ff">Select image : </label><input type="file" style="width:180px;height:100px;padding:10px;" name="filename" >
<span class="error"><br> <?php echo $fileToUploadErr; ?></span>
<span class="error"><br> <?php echo $fileToUploadErrrr; ?></span>
<span class="error"><br> <?php echo $fileToUploadErrrrr; ?></span>
<span class="error"><br> <?php echo $fileToUploadErrrrrr; ?></span>
<input type="submit" class="button" name="update" value="Update">
<a href="welcome.php">Back</a>
</form>
</div>
</body>
</html>
您应该将enctype=“multipart/form data”
属性添加到form
元素中：
<form method="POST" action="" enctype="multipart/form-data">
编辑图像操作时
您应该使用if-else条件放置更新sql查询
所以基本上
if(empty($image_file_name)){
//query without image column
$sql = "update `users` set name='$name',username='$username',
email='$email', Date_of_birth='$DateOfBirth', department='$department',
age='$age' where userid ='$id'" ;
//do not forget to execute query here with mysqli_query
}
if(!empty($image_file_name)){
//query with image column
$sql = "update `users` set name='$name',username='$username',
email='$email', Date_of_birth='$DateOfBirth', department='$department',age='$age',
image_name='$image_file_name' where userid ='$id'" ;
//do not forget to execute query here with mysqli_query
}
另外，请确保我们不能在输入type='file'中预取文本框之类的值，但可以使用img标记预览已上载的图像
因此，取而代之的是
<input type='file' value='<?php echo $filename; ?>' <!--do not use this-->
注意：未定义索引：C:\xampp\htdocs\registration\u form\u 2\editform.php中的fileToUpload在第92行注意：未定义索引：C:\xampp\htdocs\registration\u form\u 2\editform.php中的fileToUpload在第95行未定义索引：C:\xampp\htdocs\registration\u form\u 2\editform.php中的filename在第28行我收到这三个错误`$uploadfile=$uploaddir。basename（$_文件['fileToUpload']['name']）；`您在$\u文件中没有fileToUpload
您是否在表单元素中添加了enctype=“…”
属性？先生，我没有得到您所说的先生抱歉，但我没有看到任何更新
<input type='file'>
<img src='your_already_uploaded_file_path' height='50px' width='50px'> <!--change height width as you wish-->