当某些输入是 blob 并且必须在 PHP 中发送 send_long_data() 时，如何绑定不同数量的输入
How to bind varying number of inputs when some are blob and must be sent send_long_data() in PHP
我正在做一项学校作业，我需要处理一个表单，其中包含位置、价格、描述等值，以及 1 到 4 张每张最大 5MB 的图片。我需要上传到数据库，但我无法获取使用 send_long_data() 发送的图像。我不知道如何只处理一些输入作为发送长数据。我已经能够使用 call_user_func_array() 拼凑代码以通过引用绑定输入数组，但是一天多来我都没有运气让它工作。编码新手，我很难过。感谢任何帮助。
**<?php
//show logged in/logout header
include 'header.php';
include 'connectLankasListDB.php';
$image_count = 0;
if(!isset($_SESSION['username'])) {
echo ('Please login before posting.');
sleep(2);
header('Location: login.html');
} elseif (empty($_POST['title']) or
empty($_POST['price']) or
empty($_POST['description']) or
empty($_POST['email']) or
empty($_POST['confirm_email'])) {
//All fields not filled out
echo 'Please fill out title, price, description, email, and email-confirmation fields.';
echo '<br/>';
echo '<a href="new_post.html">New Post</a>';
//email not a valid email, prompt to enter correct email
} elseif (filter_var($_POST['email'], FILTER_VALIDATE_EMAIL) === false) {
die("Enter a valid email address.");
//terms agreement checkbox not checked
} elseif ($_POST['terms'] === '0') {
die("Please agree to terms and conditions");
//email and confirmation email match, continue with script
} elseif ($_POST['email'] !== $_POST['confirm_email']) {
echo 'Email and confirmation email do not match--try again!';
//Check that image files are correct type and within the size limit
} elseif (isset($_FILES['images1'])) {
//print_r($_FILES);
$image_count = count(array_filter($_FILES['images1']['tmp_name'])); //number of uploaded images
$allowed_extensions = array("jpg", "jpeg", "png", "gif", "bmp");
for ($x=0; $x < $image_count; $x++) {
$file_name = $_FILES['images1']['name'][$x];
$file_size = $_FILES['images1']['size'][$x];
$file_tmp = $_FILES['images1']['tmp_name'];
//$ext = substr($file_name, strlen($file_name)-4,strlen($file_name));
$ext = explode(".", $file_name);
$file_ext = strtolower(end($ext));
echo $file_ext;
if (!in_array($file_ext, $allowed_extensions)) {
die("Only jpg, jpeg, png, gif, and bmp files allowed!");
} elseif ($file_size > 5000000) {
die("File size limit (5MB) exceed!");
}
}
}
//user has filled in all required fields
//validate and sanitize, store to variables
$sub_category = filter_input(INPUT_POST, 'sub_category', FILTER_SANITIZE_STRING);
$location = filter_input(INPUT_POST, 'location', FILTER_SANITIZE_STRING);
$title = filter_input(INPUT_POST, 'title', FILTER_SANITIZE_STRING);
$price = filter_input(INPUT_POST, 'price', FILTER_SANITIZE_NUMBER_FLOAT);
$description = filter_input(INPUT_POST, 'description', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);
$timestamp = date("Y-m-d H:i:s");
$terms = '1';
//retrieve Location_ID from Location table for Posts table
$sql1 = "SELECT Location_ID FROM Location WHERE LocationName = '$location'";
$query1 = mysqli_query($conn, $sql1) or die(mysqli_error($conn));
$result1 = mysqli_fetch_assoc($query1);
$location_id = $result1["Location_ID"];
//retrieve Subcategory_ID from SubCategory table for Posts table
$sql2 = "SELECT SubCategory_ID FROM SubCategory WHERE SubCategoryName = '$sub_category'";
$query2 = mysqli_query($conn, $sql2);
$result2 = mysqli_fetch_assoc($query2);
$subcategory_id = $result2["SubCategory_ID"];
/*
//save to Posts table
mysqli_query($conn, "INSERT INTO Posts
(Location_ID, title, price, description, email, SubCategory_ID, TimeStamp, Agreement)
VALUES
('" . $location_id . "', '" . $title . "', '" . $price . "', '". $description . "', '" . $email ."',"
. "'" . $subcategory_id ."', '" . $timestamp ."', '" . $terms . "')")
OR die(mysqli_error($conn));*/
**//query for insert with no images
$ins_query_fields = "Location_ID, Title, Price, Description, Email, SubCategory_ID,TimeStamp, Agreement";
$ins_query_vals = "?,?,?,?,?,?,?,?";
$type_args = "ssssssss";
$bind_vars = array($location_id, $title, $price, $description, $email, $subcategory_id, $timestamp, $terms);
$tmp_name_array = array();
$pic_name_array = array();
//print_r($_FILES['images1']['tmp_name']);
//prepare query based on number of images
if ($image_count > 0) {
$i = 1;
for($n = 0; $n < $image_count; $n++) {
$ins_query_fields .= ", Image_" . $i;
array_push($pic_name_array, "Image_". $i);
$ins_query_vals .= ",?";
$type_args .= "s";
${"Image_". $i} = $_FILES['images1']['tmp_name'][$n];
array_push($tmp_name_array, ${"Image_". $i});
$i++;
}
$bind_vars = array_merge($bind_vars, $tmp_name_array);
}
**//save image files to Posts table
///////////////////////////////////////
$stmt = $conn->prepare("INSERT INTO Posts($ins_query_fields) VALUES($ins_query_vals)");
//
//bind params by reference
$inputArray[] = &$type_args;
$j = count($bind_vars);
for($i=0; $i < $j; $i++) {
$inputArray[] = &$bind_vars[$i];
}
//print_r($inputArray);
//use call_user_func_array
call_user_func_array(array($stmt, 'bind_param'), $inputArray);
//$stmt->execute();
//print_r($bind_vars);
print_r($tmp_name_array);
if ($image_count > 0) {
$index = count($bind_vars) - $image_count - 1;
for($i = 0; $i < $image_count; $i++) {
$contents = $tmp_name_array[$i];
//$fp = fopen($bind_vars[($index) + $i], "r");
$fp = fopen($contents, "r");
$size = 0;
while ($data = fread($fp, 1024)) {
$size += strlen($data);
$stmt->send_long_data($index, $data);
}
}
}
if ($stmt->execute()) {
} else {
die($conn->error);
}****
echo 'Your post has been saved.<br/>';
echo '<br/>';
echo '<a href="index.php">Go to Main Page</a>';
?>**
好的，我尝试将数据上传和图像 blob 上传分开，数据上传是固定数量的变量，我曾尝试使用循环进行图像 blob 上传。第一个数据发布，图像没有。这样甚至可行吗？一定有一些我不理解的基本原则。这是修改后的代码，省略了验证步骤。
``if ($image_count > 0) {
$i = 1;
$pic_query_holder_x = "";
$tmp_name_array = array();
$pic_in_fields = array();
$pic_type_args = "";
for($n = 0; $n < $image_count; $n++) {
//$ins_query_fields .= ", Image_" . $i;
array_push($pic_in_fields, "Image_". $i);
$pic_query_holder_x .= ",?";
$pic_type_args .= "s";
${"Image_". $i} = $_FILES['images1']['tmp_name'][$n];
array_push($tmp_name_array, ${"Image_". $i});
$i++;
}
$pic_query_holder = ltrim($pic_query_holder_x, ',');
$pic_bind_vars = $tmp_name_array;
echo '<br/>';
echo $pic_query_holder;
echo '<br/>';
print_r($tmp_name_array);
}
//save image files to Posts table
///////////////////////////////////////
$stmt = $conn->prepare("INSERT INTO Posts($ins_query_fields)
VALUES($ins_query_vals)");
//
//bind params by reference
$inputArray[] = &$type_args;
$j = count($bind_vars);
for($i=0; $i < $j; $i++) {
$inputArray[] = &$bind_vars[$i];
}
//use call_user_func_array
call_user_func_array(array($stmt, 'bind_param'), $inputArray);
$stmt->execute();
//$index = count($bind_vars) - $image_count -1;
//$fp = fopen($tmp_name_array[$index], "r");
//$stmt->execute();
//print_r($pic_in_fields);
//print_r($pic_query_holder);
if ($image_count > 0) {
//bind params
$in_array[] = &$pic_type_args;
$k = count($tmp_name_array);
for ($i=0; $i < $k; $i++) {
$in_array[] = &$tmp_name_array[$i];
}
//$index = count($tmp_name_array) - $image_count - 1;
for($i = 0; $i < $image_count; $i++) {
//prepare statement
$go_pics = $conn->prepare("INSERT INTO Posts($pic_in_fields[$i]) VALUES(?)");
$contents = $tmp_name_array[$i];
//$fp = fopen($bind_vars[($index) + $i], "r");
$fs = fopen($contents, "r");
$size = 0;
while ($data = fread($fs, 1024)) {
$size += strlen($data);
$go_pics->send_long_data($i, $data);
}
//print_r($in_array);
$go_pics->execute();
}
}
enter code here
<?php
$stmt = $mysqli->prepare("INSERT INTO messages (message) VALUES (?)");
$null = NULL;
$stmt->bind_param("b", $null);
$fp = fopen("messages.txt", "r");
while (!feof($fp)) {
$stmt->send_long_data(0, fread($fp, 8192));
}
fclose($fp);
$stmt->execute();
?>
这直接来自 PHP 手册。 Feof() 只是为了确保文件存在并被正确打开。通过适当的循环，您可以访问图像文件并将 blob 插入数据库。或者，您可以准备一系列 blob 并单独更新或插入数据库。无论哪种方式，我认为这段代码应该让你朝着正确的方向前进。
只需 运行 在您处理非 blob 之后插入或使用 blob 数据更新该段。
此外，此 SO 页面也可能对您有所帮助。 Insert Blobs in MySql databases with php
您可以尝试修改下面的这个工作模板。这使用 send_long_data() 将图像上传到数据库。这会在一个查询中添加一条包含不同数据类型列的记录。
没有使用 call_user_func_array()，因为我认为不需要它。
<?php
$conn = new mysqli("127.0.0.1", "root", "", "db");
if(isset($_POST['submit'])) {
$null1 = NULL;
$null2 = NULL;
$null3 = NULL;
$null4 = NULL;
$title = isset($_POST['title']) ? $_POST['title'] : '';
$email = isset($_POST['email']) ? $_POST['email'] : '';
$stmt = $conn->prepare("INSERT INTO Posts (Image_1, Image_2, Image_3, Image_4, title, email ) VALUES (?,?,?,?,?,?);");
$stmt->bind_param("bbbbss", $null1, $null2, $null3, $null4, $title, $email );
for($i = 0; $i < count( $_FILES['images1']['tmp_name'] ); $i++) {
if(!empty($_FILES['images1']['tmp_name'][$i])) {
$target_file = $_FILES['images1']['tmp_name'][$i];
$fp = fopen($target_file, "r");
while (!feof($fp)) {
$stmt->send_long_data($i, fread($fp, 8192));
}
fclose($fp);
unlink($_FILES['images1']['tmp_name'][$i]);
echo "Uploading image blob success!<br/>\n";
}
}
$stmt->execute();
$stmt->close();
$conn->close();
}
?>
<form action="" method="post" enctype="multipart/form-data">
<input type="text" name="title" value="this is the title"/><br/>
<input type="text" name="email" value="john@yahoo.com"/><br/>
<input type="file" name="images1[]" value=""/><br/>
<input type="file" name="images1[]" value=""/><br/>
<input type="file" name="images1[]" value=""/><br/>
<input type="file" name="images1[]" value=""/><br/><br/>
<input type="submit" name="submit" value="Upload Data"/>
</form>
我正在做一项学校作业，我需要处理一个表单，其中包含位置、价格、描述等值，以及 1 到 4 张每张最大 5MB 的图片。我需要上传到数据库，但我无法获取使用 send_long_data() 发送的图像。我不知道如何只处理一些输入作为发送长数据。我已经能够使用 call_user_func_array() 拼凑代码以通过引用绑定输入数组，但是一天多来我都没有运气让它工作。编码新手，我很难过。感谢任何帮助。
**<?php
//show logged in/logout header
include 'header.php';
include 'connectLankasListDB.php';
$image_count = 0;
if(!isset($_SESSION['username'])) {
echo ('Please login before posting.');
sleep(2);
header('Location: login.html');
} elseif (empty($_POST['title']) or
empty($_POST['price']) or
empty($_POST['description']) or
empty($_POST['email']) or
empty($_POST['confirm_email'])) {
//All fields not filled out
echo 'Please fill out title, price, description, email, and email-confirmation fields.';
echo '<br/>';
echo '<a href="new_post.html">New Post</a>';
//email not a valid email, prompt to enter correct email
} elseif (filter_var($_POST['email'], FILTER_VALIDATE_EMAIL) === false) {
die("Enter a valid email address.");
//terms agreement checkbox not checked
} elseif ($_POST['terms'] === '0') {
die("Please agree to terms and conditions");
//email and confirmation email match, continue with script
} elseif ($_POST['email'] !== $_POST['confirm_email']) {
echo 'Email and confirmation email do not match--try again!';
//Check that image files are correct type and within the size limit
} elseif (isset($_FILES['images1'])) {
//print_r($_FILES);
$image_count = count(array_filter($_FILES['images1']['tmp_name'])); //number of uploaded images
$allowed_extensions = array("jpg", "jpeg", "png", "gif", "bmp");
for ($x=0; $x < $image_count; $x++) {
$file_name = $_FILES['images1']['name'][$x];
$file_size = $_FILES['images1']['size'][$x];
$file_tmp = $_FILES['images1']['tmp_name'];
//$ext = substr($file_name, strlen($file_name)-4,strlen($file_name));
$ext = explode(".", $file_name);
$file_ext = strtolower(end($ext));
echo $file_ext;
if (!in_array($file_ext, $allowed_extensions)) {
die("Only jpg, jpeg, png, gif, and bmp files allowed!");
} elseif ($file_size > 5000000) {
die("File size limit (5MB) exceed!");
}
}
}
//user has filled in all required fields
//validate and sanitize, store to variables
$sub_category = filter_input(INPUT_POST, 'sub_category', FILTER_SANITIZE_STRING);
$location = filter_input(INPUT_POST, 'location', FILTER_SANITIZE_STRING);
$title = filter_input(INPUT_POST, 'title', FILTER_SANITIZE_STRING);
$price = filter_input(INPUT_POST, 'price', FILTER_SANITIZE_NUMBER_FLOAT);
$description = filter_input(INPUT_POST, 'description', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);
$timestamp = date("Y-m-d H:i:s");
$terms = '1';
//retrieve Location_ID from Location table for Posts table
$sql1 = "SELECT Location_ID FROM Location WHERE LocationName = '$location'";
$query1 = mysqli_query($conn, $sql1) or die(mysqli_error($conn));
$result1 = mysqli_fetch_assoc($query1);
$location_id = $result1["Location_ID"];
//retrieve Subcategory_ID from SubCategory table for Posts table
$sql2 = "SELECT SubCategory_ID FROM SubCategory WHERE SubCategoryName = '$sub_category'";
$query2 = mysqli_query($conn, $sql2);
$result2 = mysqli_fetch_assoc($query2);
$subcategory_id = $result2["SubCategory_ID"];
/*
//save to Posts table
mysqli_query($conn, "INSERT INTO Posts
(Location_ID, title, price, description, email, SubCategory_ID, TimeStamp, Agreement)
VALUES
('" . $location_id . "', '" . $title . "', '" . $price . "', '". $description . "', '" . $email ."',"
. "'" . $subcategory_id ."', '" . $timestamp ."', '" . $terms . "')")
OR die(mysqli_error($conn));*/
**//query for insert with no images
$ins_query_fields = "Location_ID, Title, Price, Description, Email, SubCategory_ID,TimeStamp, Agreement";
$ins_query_vals = "?,?,?,?,?,?,?,?";
$type_args = "ssssssss";
$bind_vars = array($location_id, $title, $price, $description, $email, $subcategory_id, $timestamp, $terms);
$tmp_name_array = array();
$pic_name_array = array();
//print_r($_FILES['images1']['tmp_name']);
//prepare query based on number of images
if ($image_count > 0) {
$i = 1;
for($n = 0; $n < $image_count; $n++) {
$ins_query_fields .= ", Image_" . $i;
array_push($pic_name_array, "Image_". $i);
$ins_query_vals .= ",?";
$type_args .= "s";
${"Image_". $i} = $_FILES['images1']['tmp_name'][$n];
array_push($tmp_name_array, ${"Image_". $i});
$i++;
}
$bind_vars = array_merge($bind_vars, $tmp_name_array);
}
**//save image files to Posts table
///////////////////////////////////////
$stmt = $conn->prepare("INSERT INTO Posts($ins_query_fields) VALUES($ins_query_vals)");
//
//bind params by reference
$inputArray[] = &$type_args;
$j = count($bind_vars);
for($i=0; $i < $j; $i++) {
$inputArray[] = &$bind_vars[$i];
}
//print_r($inputArray);
//use call_user_func_array
call_user_func_array(array($stmt, 'bind_param'), $inputArray);
//$stmt->execute();
//print_r($bind_vars);
print_r($tmp_name_array);
if ($image_count > 0) {
$index = count($bind_vars) - $image_count - 1;
for($i = 0; $i < $image_count; $i++) {
$contents = $tmp_name_array[$i];
//$fp = fopen($bind_vars[($index) + $i], "r");
$fp = fopen($contents, "r");
$size = 0;
while ($data = fread($fp, 1024)) {
$size += strlen($data);
$stmt->send_long_data($index, $data);
}
}
}
if ($stmt->execute()) {
} else {
die($conn->error);
}****
echo 'Your post has been saved.<br/>';
echo '<br/>';
echo '<a href="index.php">Go to Main Page</a>';
?>**
好的，我尝试将数据上传和图像 blob 上传分开，数据上传是固定数量的变量，我曾尝试使用循环进行图像 blob 上传。第一个数据发布，图像没有。这样甚至可行吗？一定有一些我不理解的基本原则。这是修改后的代码，省略了验证步骤。
``if ($image_count > 0) {
$i = 1;
$pic_query_holder_x = "";
$tmp_name_array = array();
$pic_in_fields = array();
$pic_type_args = "";
for($n = 0; $n < $image_count; $n++) {
//$ins_query_fields .= ", Image_" . $i;
array_push($pic_in_fields, "Image_". $i);
$pic_query_holder_x .= ",?";
$pic_type_args .= "s";
${"Image_". $i} = $_FILES['images1']['tmp_name'][$n];
array_push($tmp_name_array, ${"Image_". $i});
$i++;
}
$pic_query_holder = ltrim($pic_query_holder_x, ',');
$pic_bind_vars = $tmp_name_array;
echo '<br/>';
echo $pic_query_holder;
echo '<br/>';
print_r($tmp_name_array);
}
//save image files to Posts table
///////////////////////////////////////
$stmt = $conn->prepare("INSERT INTO Posts($ins_query_fields)
VALUES($ins_query_vals)");
//
//bind params by reference
$inputArray[] = &$type_args;
$j = count($bind_vars);
for($i=0; $i < $j; $i++) {
$inputArray[] = &$bind_vars[$i];
}
//use call_user_func_array
call_user_func_array(array($stmt, 'bind_param'), $inputArray);
$stmt->execute();
//$index = count($bind_vars) - $image_count -1;
//$fp = fopen($tmp_name_array[$index], "r");
//$stmt->execute();
//print_r($pic_in_fields);
//print_r($pic_query_holder);
if ($image_count > 0) {
//bind params
$in_array[] = &$pic_type_args;
$k = count($tmp_name_array);
for ($i=0; $i < $k; $i++) {
$in_array[] = &$tmp_name_array[$i];
}
//$index = count($tmp_name_array) - $image_count - 1;
for($i = 0; $i < $image_count; $i++) {
//prepare statement
$go_pics = $conn->prepare("INSERT INTO Posts($pic_in_fields[$i]) VALUES(?)");
$contents = $tmp_name_array[$i];
//$fp = fopen($bind_vars[($index) + $i], "r");
$fs = fopen($contents, "r");
$size = 0;
while ($data = fread($fs, 1024)) {
$size += strlen($data);
$go_pics->send_long_data($i, $data);
}
//print_r($in_array);
$go_pics->execute();
}
}
enter code here
<?php
$stmt = $mysqli->prepare("INSERT INTO messages (message) VALUES (?)");
$null = NULL;
$stmt->bind_param("b", $null);
$fp = fopen("messages.txt", "r");
while (!feof($fp)) {
$stmt->send_long_data(0, fread($fp, 8192));
}
fclose($fp);
$stmt->execute();
?>
这直接来自 PHP 手册。 Feof() 只是为了确保文件存在并被正确打开。通过适当的循环，您可以访问图像文件并将 blob 插入数据库。或者，您可以准备一系列 blob 并单独更新或插入数据库。无论哪种方式，我认为这段代码应该让你朝着正确的方向前进。
只需 运行 在您处理非 blob 之后插入或使用 blob 数据更新该段。
此外，此 SO 页面也可能对您有所帮助。 Insert Blobs in MySql databases with php
您可以尝试修改下面的这个工作模板。这使用 send_long_data() 将图像上传到数据库。这会在一个查询中添加一条包含不同数据类型列的记录。
没有使用 call_user_func_array()，因为我认为不需要它。
<?php
$conn = new mysqli("127.0.0.1", "root", "", "db");
if(isset($_POST['submit'])) {
$null1 = NULL;
$null2 = NULL;
$null3 = NULL;
$null4 = NULL;
$title = isset($_POST['title']) ? $_POST['title'] : '';
$email = isset($_POST['email']) ? $_POST['email'] : '';
$stmt = $conn->prepare("INSERT INTO Posts (Image_1, Image_2, Image_3, Image_4, title, email ) VALUES (?,?,?,?,?,?);");
$stmt->bind_param("bbbbss", $null1, $null2, $null3, $null4, $title, $email );
for($i = 0; $i < count( $_FILES['images1']['tmp_name'] ); $i++) {
if(!empty($_FILES['images1']['tmp_name'][$i])) {
$target_file = $_FILES['images1']['tmp_name'][$i];
$fp = fopen($target_file, "r");
while (!feof($fp)) {
$stmt->send_long_data($i, fread($fp, 8192));
}
fclose($fp);
unlink($_FILES['images1']['tmp_name'][$i]);
echo "Uploading image blob success!<br/>\n";
}
}
$stmt->execute();
$stmt->close();
$conn->close();
}
?>
<form action="" method="post" enctype="multipart/form-data">
<input type="text" name="title" value="this is the title"/><br/>
<input type="text" name="email" value="john@yahoo.com"/><br/>
<input type="file" name="images1[]" value=""/><br/>
<input type="file" name="images1[]" value=""/><br/>
<input type="file" name="images1[]" value=""/><br/>
<input type="file" name="images1[]" value=""/><br/><br/>
<input type="submit" name="submit" value="Upload Data"/>
</form>