PHP/MySQL:图像成功保存到数据库，但未能在网页上显示
我的系统有一个很奇怪的问题。我已经创建了一个系统将图像上传到数据库并显示它。问题是，图像已成功上载，但它将返回消息“上载失败！”。然后，已上载的图片不显示。下面是我的代码：PHP/MySQL:图像成功保存到数据库，但未能在网页上显示,php,mysql,pdo,Php,Mysql,Pdo,我的系统有一个很奇怪的问题。我已经创建了一个系统将图像上传到数据库并显示它。问题是，图像已成功上载，但它将返回消息“上载失败！”。然后，已上载的图片不显示。下面是我的代码： <body> <div class="wrapperDiv"> <form action="" method="post" id="form" enctype="multipart/form-data"> U
<body>
<div class="wrapperDiv">
<form action="" method="post" id="form" enctype="multipart/form-data">
Upload image :
<input type="file" name="uploadFile" value="" />
<input type="submit" name="submitBtn" value="Upload" />
</form>
<?php
$last_insert_id = null;
include('db2.php');
if(isset($_POST['submitBtn']) && !empty($_POST['submitBtn'])) {
if(isset($_FILES['uploadFile']['name']) && !empty($_FILES['uploadFile']['name'])) {
//Allowed file type
$allowed_extensions = array("jpg","jpeg","png","gif");
//File extension
$ext = strtolower(pathinfo($_FILES['uploadFile']['name'], PATHINFO_EXTENSION));
//Check extension
if(in_array($ext, $allowed_extensions)) {
//Convert image to base64
$encoded_image = base64_encode(file_get_contents($_FILES['uploadFile']['tmp_name']));
$encoded_image = $encoded_image;
$query = "INSERT INTO tbl_images SET encoded_image = '".$encoded_image."'";
$sql = $conn->prepare($query);
$sql -> execute();
//$results = $sql -> fetchAll(PDO::FETCH_OBJ);
echo "File name : " . $_FILES['uploadFile']['name'];
echo "<br>";
if($sql->rowCount() > 1 ) {
echo "Status : Uploaded";
$last_insert_id = $conn-> lastInsertId();
} else {
echo "Status : Failed to upload!";
}
} else {
echo "File not allowed";
}
}
if($last_insert_id) {
$query = "SELECT encoded_image FROM tbl_images WHERE id= ". $last_insert_id;
$sql = $conn->prepare($query);
$sql -> execute();
if($sql->rowCount($sql) == 1 ) {
//$row = mysqli_fetch_object($result);
while($row = $sql->fetch(PDO::FETCH_ASSOC)) {
echo "<br><br>";
echo '<img src="'.$row->encoded_image.'" width="250">';
}
}
}
}
?>
</div>
</body>
上载图像：
您首先做了一些错误的事情，当存储在数据库中时，您对图像进行了编码，因此您必须再次对其进行解码，并且src in标记获取url而不是图像内容，只是像这样回显内容：
header('Content-type: image/jpeg');
echo base64_decode($row->encoded_image);
或
encoded_图像。“”width=“250”>
但无论如何，将图像存储在数据库中不是一个好的选择，您的数据库会变得太重，无法快速响应，并且内存太大。您可以将图像名称存储在数据库中，然后将文件从服务器中的特定位置移走，您可以这样显示
echo '<img src="specialRoot/'.$row->image_name.'" width="250">';
echo“image_name.”“width=“250”>；
将图像存储在文件夹中。。
我已经在根目录中创建了uploads文件夹，您可以在任何地方创建文件夹，并在获取图像时写入路径
<body>
<div class="wrapperDiv">
<form action="" method="post" id="form" enctype="multipart/form-data">
Upload image :
<input type="file" name="uploadFile" value="" />
<input type="submit" name="submitBtn" value="Upload" />
</form>
<?php
$last_insert_id = null;
include('db2.php');
if(isset($_POST['submitBtn']) && !empty($_POST['submitBtn'])) {
if(isset($_FILES['uploadFile']['name']) && !empty($_FILES['uploadFile']['name'])) {
//Allowed file type
$allowed_extensions = array("jpg","jpeg","png","gif");
$name = $_FILES['uploadFile']['name'];
$target_dir = "uploads/"; //give path of your folder where images are stored.
$target_file = $target_dir . basename($_FILES["uploadFile"]["name"]);
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
//Check extension
if( in_array($imageFileType,$allowed_extensions) ){
//Convert image to base64
$image_base64 = base64_encode(file_get_contents($_FILES['uploadFile']['tmp_name']) );
$encoded_image = 'data:image/'.$imageFileType.';base64,'.$image_base64;
//$encoded_image = base64_encode($_FILES['uploadFile']['tmp_name']);
//$encoded_image = $encoded_image;
$query = "INSERT INTO tbl_images SET encoded_image = '".$encoded_image."'";
$sql = $conn->prepare($query);
$result = $sql -> execute();
move_uploaded_file($_FILES['uploadFile']['tmp_name'],$target_dir.$name);
echo "File name : " . $_FILES['uploadFile']['name'];
echo "<br>";
if($result == 1) {
echo "Status : Uploaded";
$last_insert_id = $conn->insert_id;
} else {
echo "Status : Failed to upload!";
}
} else {
echo "File not allowed";
}
}
if($last_insert_id) {
$query = "SELECT encoded_image FROM tbl_images WHERE id= ". $last_insert_id;
$result = $conn->query($query);
while($row = $result->fetch_assoc()){
echo '<img src="'.$row['encoded_image'].'" width="250">';
}
}
}
?>
</div>
</body>
上载图像：
如果（在数组（strtolower（$ext），$allowed_extensions）中）{我想您需要在图像编码字符串之前的src标记之间添加add data:image/png。@VikashDhiman echo'encoded_image.“width=”250“>”；像这样吗failed@manu你能在上面的问题上编辑我的代码吗？我还是不明白
<body>
<div class="wrapperDiv">
<form action="" method="post" id="form" enctype="multipart/form-data">
Upload image :
<input type="file" name="uploadFile" value="" />
<input type="submit" name="submitBtn" value="Upload" />
</form>
<?php
$last_insert_id = null;
include('db2.php');
if(isset($_POST['submitBtn']) && !empty($_POST['submitBtn'])) {
if(isset($_FILES['uploadFile']['name']) && !empty($_FILES['uploadFile']['name'])) {
//Allowed file type
$allowed_extensions = array("jpg","jpeg","png","gif");
$name = $_FILES['uploadFile']['name'];
$target_dir = "uploads/"; //give path of your folder where images are stored.
$target_file = $target_dir . basename($_FILES["uploadFile"]["name"]);
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
//Check extension
if( in_array($imageFileType,$allowed_extensions) ){
//Convert image to base64
$image_base64 = base64_encode(file_get_contents($_FILES['uploadFile']['tmp_name']) );
$encoded_image = 'data:image/'.$imageFileType.';base64,'.$image_base64;
//$encoded_image = base64_encode($_FILES['uploadFile']['tmp_name']);
//$encoded_image = $encoded_image;
$query = "INSERT INTO tbl_images SET encoded_image = '".$encoded_image."'";
$sql = $conn->prepare($query);
$result = $sql -> execute();
move_uploaded_file($_FILES['uploadFile']['tmp_name'],$target_dir.$name);
echo "File name : " . $_FILES['uploadFile']['name'];
echo "<br>";
if($result == 1) {
echo "Status : Uploaded";
$last_insert_id = $conn->insert_id;
} else {
echo "Status : Failed to upload!";
}
} else {
echo "File not allowed";
}
}
if($last_insert_id) {
$query = "SELECT encoded_image FROM tbl_images WHERE id= ". $last_insert_id;
$result = $conn->query($query);
while($row = $result->fetch_assoc()){
echo '<img src="'.$row['encoded_image'].'" width="250">';
}
}
}
?>
</div>
</body>