我正在一个项目中，每个项目可能有多个图像，我创建了一个接受图像并将其存储到数组中的表单。问题是，每当我尝试将图像插入数据库的表行中时，都会显示错误：
“数组到字符串的转换”
我该如何解决？还有如何从同一数据库表中获取另一页上的每个图像。下面是我的代码。
-格式代码
<form method="post" enctype="multipart/form-data" >
<input required type="text" name="name">
<input required type="text" name="location">
<input required type="text" name="status">
<select required name="category">
<option>Category</option>
<option value="construct">Construction</option>
<option value="promgt">Project Development</option>
<option value="archdesign">Architectural Designs</option>
</select>
<textarea required class="form-control" name="descrip" rows="5"></textarea>
<input style="text-align:left" type="file" name="imgs[]" multiple>
<button type="submit" name="submit" formaction="addaction.php">Add Project</button>
</form>
-Addaction.php代码
<?php
$db=mysqli_connect("localhost","root","dbpassword","dbname");
if(!empty($_FILES['imgs']['name'][0])){
$imgs = $_FILES['imgs'];
$uploaded = array();
$failed = array();
$allowed = array('jpg', 'png');
foreach($imgs['name'] as $position => $img_name){
$img_tmp = $imgs['tmp_name'][$position];
$img_size = $imgs['size'][$position];
$img_error = $imgs['error'][$position];
$img_ext = explode('.',$img_name);
$img_ext = strtolower(end($img_ext));
if(in_array($img_ext, $allowed)) {
if($img_error === 0){
if($img_size <= 500000) {
$img_name_new = uniqid('', true) . '.' . $img_ext;
$img_destination = 'img/'.$img_name_new;
if(move_uploaded_file($img_tmp, $img_destination)){
$uploaded[$position] = $img_destination;
}else{
$failed[$position] = "[{$img_name}] failed to upload";
}
}else{
$failed[$position] = "[{$img_name}] is too large";
}
}else{
$failed[$position] = "[{$img_name}] error";
}
}else{
$failed[$position] = "[{$img_name}] file extension";
}
}
if(!empty($uploaded)){
print_r($uploaded);
}
if(!empty($failed)){
print_r($failed);
}
}
if(isset($_POST['submit'])){
$name = $_POST['name'];
$location = $_POST['location'];
$status = $_POST['status'];
$descrip = $_POST['descrip'];
$category = $_POST['category'];
$img_name_new = $_FILES['imgs']['name'];
if ($db->connect_error){
die ("Connection Failed: " . $db->connect_error);
}
$sql_u = "SELECT * FROM projects WHERE name='$name'";
$sql_e = "SELECT * FROM projects WHERE category='$category'";
$res_u = mysqli_query($db, $sql_u);
$res_e = mysqli_query($db, $sql_e);
if (mysqli_num_rows($res_u) && mysqli_num_rows($res_e) > 0) {
echo "<div style='margin: 0 80px' class='alert alert-danger' role='alert'> Error. Item Already exists </div>";
header("refresh:3 url=add.php");
}else{
$sql_i = "INSERT INTO items (name, location, status, descrip, imgs, category) VALUES ('$name','$location','$status,'$descrip','$img_name_new','$category')";
}
if (mysqli_query($db, $sql_i)){
echo "Project Added Successfully";
}else{
echo mysqli_error($db);
}
$db->close();
}
?>
答案 0 :(得分：0)
$img_name_new = $_FILES['imgs']['name']是一个或多个图像名称的数组。
您需要确定如何将数组数据作为字符串存储在数据库中。
这里有几个明智的选择，但是选择最佳选择将取决于一旦将这些数据保存在数据库中后，您将如何使用。
implode()它-$img_name_new = implode(',', $_FILES['imgs']['name']); json_encode()它-$img_name_new = json_encode($_FILES['imgs']['name']); 这是我今年的好事 ...
表单脚本：
<?php
if (!$db = new mysqli("localhost", "root", "", "db")) { // declare and check for a falsey value
echo "Connection Failure"; // $db->connect_error <-- never show actual error details to public
} else {
if ($result = $db->query("SELECT name FROM items")) {
for ($rows = []; $row = $result->fetch_row(); $rows[] = $row);
$result->free();
?>
<script>
function checkName() {
var names = '<?php echo json_encode($rows); ?>';
var value = document.forms['project']['name'].value;
if (names.indexOf(value) !== -1) { // might not work on some old browsers
alert(value + ' is not a unique name. Please choose another.');
return false;
}
}
</script>
<?php
}
?>
<form name="project" method="post" enctype="multipart/form-data" onsubmit="return checkName()">
Name: <input required type="text" name="name"><br>
Location: <input required type="text" name="location"><br>
Status: <input required type="text" name="status"><br>
Category: <select required name="category">
<?php
if ($result = $db->query("SELECT category, category_alias FROM categories")) {
while ($row = $result->fetch_assoc()) {
echo "<option value=\"{$row['category']}\">{$row['category_alias']}</option>";
}
}
?>
</select><br>
<textarea required class="form-control" name="descrip" rows="5"></textarea><br>
<input style="text-align:left" type="file" name="imgs[]" multiple><br>
<button type="submit" name="submit" formaction="addaction.php">Add Project</button>
</form>
<?php
}
*请注意，我已经制作了一个单独的category表进行验证。
提交处理脚本：（addaction.php）
<?php
if (isset($_POST['submit'], $_POST['name'], $_POST['location'], $_POST['status'], $_POST['descrip'], $_POST['category'], $_FILES['imgs']['name'][0])) {
$paths = [];
if (!empty($_FILES['imgs']['name'][0])) {
$imgs = $_FILES['imgs'];
$allowed = array('jpg', 'png');
foreach($imgs['name'] as $position => $img_name){
$img_tmp = $imgs['tmp_name'][$position];
$img_size = $imgs['size'][$position];
$img_error = $imgs['error'][$position];
$img_ext = strtolower(pathinfo($img_name)['extension']);
if (!in_array($img_ext, $allowed)) {
$errors[] = "File extension is not in whitelist for $img_name ($position)";
} elseif ($img_error) {
$errors[] = "Image error for $img_name ($position): $image_error";
} elseif ($img_size > 500000) {
$errors[] = "Image $image_name ($position) is too large";
} else {
$img_destination = 'img/' . uniqid('', true) . ".$img_ext";
if (!move_uploaded_file($img_tmp, $img_destination)) {
$errors[] = "Failed to move $img_name ($position) to new directory";
} else {
$paths[] = $img_destination;
}
}
}
}
if (!empty($errors)) {
echo '<ul><li>' , implode('</li><li>', $errors) , '</li></ul>';
} elseif (!$db = new mysqli("localhost", "root", "", "db")) { // declare and check for a falsey value
echo "Connection Failure"; // $db->connect_error <-- never show actual error details to public
} elseif (!$stmt = $db->prepare("SELECT COUNT(*) FROM categories WHERE category = ?")) {
echo "Prepare Syntax Error"; // $db->error; <-- never show actual error details to public
} elseif (!$stmt->bind_param("s", $_POST['category']) || !$stmt->execute() || !$stmt->bind_result($found) || !$stmt->fetch()) {
echo "Category Statement Error"; // $stmt->error; <-- never show actual error details to public
} elseif (!$found) {
echo "Category Not Found - Project Not Saved";
} else {
$stmt->close();
$cs_paths = (string)implode(',', $paths);
// Set the `name` column in `items` to UNIQUE so that you cannot receive duplicate names in database table
if (!$stmt = $db->prepare("INSERT INTO items (name, location, status, category, descrip, imgs) VALUES (?,?,?,?,?,?)")) {
echo "Error @ prepare"; // $db->error; // don't show to public
} elseif (!$stmt->bind_param("ssssss", $_POST['name'], $_POST['location'], $_POST['status'], $_POST['category'], $_POST['descrip'], $cs_paths)) {
echo "Error @ bind"; // $stmt->error; // don't show to public
} elseif (!$stmt->execute()) {
if ($stmt->errno == 1062) {
echo "Duplicate name submitted, please go back to the form and change the project name to be unique";
} else {
echo "Error @ execute" , $stmt->error; // $stmt->error; // don't show to public
}
} else {
echo "Project Added Successfully";
}
}
}