Php 单击“提交”时，页面将变为白色空白
我是一名学生，有人给我一个任务，让我建立一个预订系统。我对php有点陌生，所以我仍然需要一些指导，我的问题是，当我尝试从表单中插入数据时，我的页面在单击submit按钮后变成白色空白 我试着在谷歌上搜索答案，有些答案是因为php编码中有额外的/缺少括号、额外的空格，还有一个技巧可以将这种编码放在php代码Php 单击“提交”时，页面将变为白色空白,php,mysqli,Php,Mysqli,我是一名学生，有人给我一个任务，让我建立一个预订系统。我对php有点陌生，所以我仍然需要一些指导，我的问题是，当我尝试从表单中插入数据时，我的页面在单击submit按钮后变成白色空白 我试着在谷歌上搜索答案，有些答案是因为php编码中有额外的/缺少括号、额外的空格，还有一个技巧可以将这种编码放在php代码错误报告（-1）的开头查看错误是什么，但不幸的是，没有正确的解决方案 通过发布这篇文章，我希望你们中的一些人能帮助我，看看我的编码有什么问题 非常需要你的帮助。事先非常感谢你 Page2.php
错误报告（-1）的开头<?php
session_start();
require('db.php');
include("auth.php");
$status = "";
if(isset($_POST['new']) && $_POST['new']==1){
$trn_date = date("Y-m-d H:i:s");
$checkBox = implode(',', $_POST['item']);
$microphones = $_REQUEST['microphones'];
$amplifers =$_REQUEST['amplifers'];
$loudspeakers = $_REQUEST['loudspeakers'];
$mixers =$_REQUEST['mixers'];
$catatan = $_REQUEST['catatan'];
$submittedby = $_SESSION["username"];
$ins_query="insert into pasystems
(`trn_date`,`item`,`microphones`,`amplifers`,`loudspeakers`,`mixers`,`catatan`,`submittedby`)values
('$trn_date','". $checkBox ."','$microphones','$amplifers','$loudspeakers','$mixers','$catatan','$submittedby')";
mysqli_query($con,$ins_query)
or die(mysql_error());
$status = "New Record Inserted Successfully.
</br></br><a href='view.php'>View Inserted Record</a>";
}
?>
<form action="Page2.php" name="form" method="POST">
<input type="hidden" name="new" value="1" />
<ul class="errorMessages"></ul>
<div class="form-group row text-left">
<label for="example-date-input" class="col-2 col-form-label">Nama Peralatan: </label>
<div class="col-10">
<div class="form-group">
<div class="form-row">
<div class="col-md-3">
<div class="form-check text-left">
<label class="form-check-label">
<input class="form-check-input" name="item[]" type="checkbox" value="Microphones">
Microphones
</label>
</div>
</div>
<div class="">
<input class="form-control" type="number" name="microphones" value="0" id="example-number-input">
</div>
</div>
</div>
<div class="form-group">
<div class="form-row">
<div class="col-md-3">
<div class="form-check text-left">
<label class="form-check-label">
<input class="form-check-input" name="item[]" type="checkbox" value="Amplifiers">
Amplifiers
</label>
</div>
</div>
<div class="">
<input class="form-control" type="number" name="amplifiers" value="0" id="example-number-input">
</div>
</div>
</div>
<div class="form-group">
<div class="form-row">
<div class="col-md-3">
<div class="form-check text-left">
<label class="form-check-label">
<input class="form-check-input" name="item[]" type="checkbox" value="Loudspeakers">
Loudspeakers
</label>
</div>
</div>
<div class="">
<input class="form-control" type="number" name="loudspeakers" value="0" id="example-number-input">
</div>
</div>
</div>
<div class="form-group">
<div class="form-row">
<div class="col-md-3">
<div class="form-check text-left">
<label class="form-check-label">
<input class="form-check-input" name="item[]" type="checkbox" value="Mixers">
Mixers
</label>
</div>
</div>
<div class="">
<input class="form-control" type="number" name="mixers" value="0" id="example-number-input">
</div>
</div>
</div>
</div>
</div>
<div class="form-group row text-left">
<label for="exampleTextarea" class="col-2 col-form-label">Catatan: </label>
<div class="col-10">
<textarea class="form-control" name="catatan" id="exampleTextarea" rows="3"></textarea>
</div>
</div>
<p style="color:#FF0000;"><?php echo $status; ?></p>
<center><button type="submit" name="submit" class="btn btn-info">Submit</button></center>
</form>
我不使用过程风格，所以我的代码可能有输入错误——我在发布之前没有测试。我写了内联注释来帮助解释我的代码片段。有效的isset（）
语法允许在其中包含多个变量。在bind（）
中，我假设您的列在数据库中是int类型的，所以我使用了I
，而submittedby
是varchar/string类型。这可能不能解决所有问题，但它应该让您自己调试它。编辑：我刚才看到你在评论中说，amplifiers
应该是amplifiers
，所以我调整了我的答案
未经测试的程序样式代码：
session_start();
require('db.php');
include("auth.php");
if(isset($_SESSION["username"],$_POST['new'],$_POST['microphones'],$_POST['amplifiers'],$_POST['loudspeakers'],$_POST['mixers'],$_POST['catatan'])){ // check superglobals
// for debugging: var_export($_SESSION); echo "<br><br>"; var_export($_POST);
if(mysqli_connect_errno()){ // check connection for an error
echo "Connection Error: ",mysqli_connect_error(); // do not echo when live
}else{
$stmt=mysqli_stmt_init($con);
if(!mysqli_stmt_prepare($stmt,"INSERT INTO pasystems (`trn_date`,`microphones`,`amplifiers`,`loudspeakers`,`mixers`,`catatan`,`submittedby`) VALUES
(".date("Y-m-d H:i:s").",?,?,?,?,?,?)")){ // use prepared statement with placeholders for security/reliability and check for false
echo "Statement Preparation Error: ",mysqli_stmt_error($stmt); // do not echo when public
}else{
if(!mysqli_stmt_bind_param($stmt,"iiiiis",$_POST['microphones'],$_POST['amplifiers'],$_POST['loudspeakers'],$_POST['mixers'],$_POST['catatan'],$_SESSION["username"])){ // bind superglobal values to query and check for false
echo "Statement Bind Error: ",mysqli_stmt_error($stmt); // do not echo when public
}elseif(!mysqli_stmt_execute($stmt)){ // run and check query for false
echo "Statement Bind/Execution Error: ",mysqli_stmt_error($stmt); // do not echo when public
}else{
echo "New record created successfully";
// if you have a database-generated ID... echo "<br><br><a href='view.php?ID=",mysqli_stmt_insert_id($stmt),"'>View Inserted Record</a>";
}
}
mysqli_stmt_close($stmt);
}
}else{
echo "Insufficient/Invalid Submission";
}
session_start（）；
require（'db.php'）；
包括（“auth.php”）；
如果（设置（$会话[“用户名]，$发布['new']，$发布['microphones']，$发布['ampliers']，$发布['loudspeakers']，$发布['mixers']，$发布['catatan']）{//检查超球
//用于调试：var\u导出（$\u会话）；echo“
”var\u导出（$\u POST）；
如果（mysqli\u connect\u errno（））{//检查连接是否有错误
echo“Connection Error:”，mysqli_connect_Error（）；//活动时不回显
}否则{
$stmt=mysqli\u stmt\u init（$con）；
如果（！mysqli_stmt_prepare（$stmt，“插入pasystems（`trn_date`、`microsphones`、`ampliers`、`loudspeakers`、`mixers`、`catatan`、`submittedby`）值
（“.date”（“Y-m-d H:i:s”），，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，）”）
echo“语句准备错误：”，mysqli_stmt_Error（$stmt）；//公开时不回显
}否则{
如果（！mysqli_stmt_bind_param（$stmt，“iiis”，$POST['microsphones']，$POST['ampliers']，$POST['loudspeakers']，$POST['mixers']，$POST['catatan']，$SESSION[“username”]）{//绑定超全局值以查询并检查是否为false
echo“语句绑定错误：”，mysqli_stmt_Error（$stmt）；//公开时不回显
}elseif（！mysqli_stmt_execute（$stmt））{//运行并检查查询是否为false
echo“语句绑定/执行错误：”，mysqli_stmt_Error（$stmt）；//公开时不回显
}否则{
echo“新记录创建成功”；
//如果您有一个数据库生成的ID…echo“
”；
}
}
mysqli_stmt_close（$stmt）；
}
}否则{
回应“提交不足/无效”；
}
这是一个使用面向对象样式的MySQLi和准备好的语句的解决方案。不过，我建议您转到PDO而不是MySQLi。它更干净更好
有一些很棒的PDO和MySQLi教程。而且，为了激活错误报告，这里有一个很好的资源可以查看：
- 原则上，所有数据访问操作都在页面的上部php中实现。获取的数据保存在数组中（如
$n\u anjuranItems
）。在html代码部分，您只需循环遍历这个数组。执行此操作时，您不会将数据访问代码与html代码混合使用
- 此外，您不应该使用php编写html代码
- 代码中有一个“@todo”。请搜索一下
- 如前所述，我重新添加了组合框“n_anjuran”。必须完成/选择输入
catatan
和n_anjuran
。但请尝试使用空/未选择的值，以便查看错误消息的显示方式。如果愿意，可以在html中为输入提供required
属性
- 您应该在PHP（服务器端）中清理和过滤发布的值。您还应该在客户端验证输入值
- 在html中，最后一个插入id被附加到“查看记录”锚点
- 我从db表中删除了复选框和“item”字段
- 根据我的喜好，我用Bootstrap3.3.7重新设计了html，并写了一些评论，希望你们能理解
- 通常，如果不涉及输入参数，可以使用
mysqli:：query
而不是mysqli\u stmt:：prepare
+mysqli\u stmt:：execute
。就个人而言，我倾向于准备sql语句，即使我不需要
祝你好运
Page db.php
使用的表值
评论不用于扩展讨论；这段对话已经结束。
<?php
/*
* Enable internal report functions. This enables the exception handling,
* e.g. mysqli will not throw PHP warnings anymore, but mysqli exceptions
* (mysqli_sql_exception).
*
* MYSQLI_REPORT_ERROR: Report errors from mysqli function calls.
* MYSQLI_REPORT_STRICT: Throw a mysqli_sql_exception for errors instead of warnings.
*
* See:
* http://php.net/manual/en/class.mysqli-driver.php
* http://php.net/manual/en/mysqli-driver.report-mode.php
* http://php.net/manual/en/mysqli.constants.php
*/
$mysqliDriver = new mysqli_driver();
$mysqliDriver->report_mode = (MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
// Create the db connection.
$connection = new mysqli('host', 'user', 'pass', 'db');
<?php
session_start();
require_once 'db.php';
require_once 'auth.php';
// @todo Delete. Just for testing.
$_SESSION['username'] = 'Tarzan';
// Flag to signalize if record saved.
$recordSaved = FALSE;
/*
* ================================
* Operations upon form submission.
* ================================
*/
if (isset($_POST['submitButton'])) {
/*
* ==========================
* Validate the input values.
* ==========================
*/
if (!isset($_POST['microphones'])) {
$errors[] = 'Please provide the microphones number.';
}
if (!isset($_POST['amplifiers'])) {
$errors[] = 'Please provide the amplifiers number.';
}
if (!isset($_POST['loudspeakers'])) {
$errors[] = 'Please provide the loudspeakers number.';
}
if (!isset($_POST['mixers'])) {
$errors[] = 'Please provide the mixers number.';
}
if (!isset($_POST['catatan']) || empty($_POST['catatan'])) {
$errors[] = 'Please provide the catatan.';
}
if (!isset($_POST['n_anjuran']) || empty($_POST['n_anjuran'])) {
$errors[] = 'Please select a n_anjuran.';
}
/*
* ======================
* Read the input values.
* ======================
*/
$trnDate = date('Y-m-d H:i:s');
$microphones = $_POST['microphones'];
$amplifiers = $_POST['amplifiers'];
$loudspeakers = $_POST['loudspeakers'];
$mixers = $_POST['mixers'];
$catatan = $_POST['catatan'];
$n_anjuran = $_POST['n_anjuran'];
$submittedBy = $_SESSION['username'];
/*
* ========================================
* Save the new record if no errors raised.
* ========================================
*/
if (!isset($errors)) {
$sql = 'INSERT INTO pasystems (
`trn_date`,
`microphones`,
`amplifiers`,
`loudspeakers`,
`mixers`,
`catatan`,
`n_anjuran`,
`submittedby`
) VALUES (
?, ?, ?, ?, ?, ?, ?, ?
)';
// Prepare the SQL statement for execution.
$statement = $connection->prepare($sql);
/*
* Bind the variables for the parameter markers (?). The first
* argument of mysqli_stmt::bind_param is a string that contains one
* or more characters which specify the types for the corresponding bind variables.
*/
$bound = $statement->bind_param(
'siiiisis' // Bind variable types.
, $trnDate
, $microphones
, $amplifiers
, $loudspeakers
, $mixers
, $catatan
, $n_anjuran
, $submittedBy
);
// Execute the prepared statement.
$executed = $statement->execute();
// Close the prepared statement and deallocate the statement handle.
$statement->close();
// Get the last insert id.
$lastInsertId = $connection->insert_id;
// Update record saved flag.
$recordSaved = TRUE;
}
}
/*
* ==========================
* Fetch the n_anjuran items.
* ==========================
*/
$sql = 'SELECT kd_dept, desc_dept FROM koddept';
// Prepare the SQL statement for execution.
$statement = $connection->prepare($sql);
/*
* Execute the prepared statement. When executed, any parameter markers
* which exist will automatically be replaced with the appropriate data.
*/
$executed = $statement->execute();
// Get the result set from the prepared statement.
$result = $statement->get_result();
// Fetch data.
$n_anjuranItems = array();
if ($result->num_rows > 0) {
$n_anjuranItems = $result->fetch_all(MYSQLI_ASSOC);
}
/*
* Free the memory associated with the result. You should
* always free your result when it is not needed anymore.
*/
$result->close();
/*
* Close the prepared statement. It also deallocates the statement handle.
* If the statement has pending or unread results, it cancels them
* so that the next query can be executed.
*/
$statement->close();
// Close the database connection.
$connection->close();
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=yes" />
<meta charset="UTF-8" />
<!-- The above 3 meta tags must come first in the head -->
<title>Demo</title>
<!-- ======================================= -->
<!-- CSS resources -->
<!-- ======================================= -->
<!-- Font-Awesome -->
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css" rel="stylesheet" />
<!-- Bootstrap -->
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" type="text/css" rel="stylesheet" />
<!-- ======================================= -->
<!-- JS resources -->
<!-- ======================================= -->
<!-- jQuery -->
<script src="https://code.jquery.com/jquery-3.2.1.min.js" type="text/javascript" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
<!-- Bootstrap -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" type="text/javascript"></script>
</head>
<body>
<div class="container">
<div class="row page-header">
<div class="col-xs-12">
<h1>
Demo
</h1>
</div>
</div>
<div class="row">
<div class="col-xs-12 col-md-6 col-md-offset-3">
<form name="form" action="Page2.php" method="post">
<?php
if (isset($errors)) {
foreach ($errors as $error) {
?>
<div class="alert alert-danger alert-dismissible" role="alert">
<button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
<i class="fa fa-exclamation-circle"></i> <?php echo $error; ?>
</div>
<?php
}
} elseif (isset($recordSaved) && $recordSaved) {
?>
<div class="alert alert-success alert-dismissible" role="alert">
<button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
<i class="fa fa-check-circle"></i> New record successfully saved. <a href='view.php?id=<?php echo $lastInsertId; ?>'>View record</a>.
</div>
<?php
}
?>
<div class="form-group">
<label for="microphones">Microphones</label>
<input type="number" name="microphones" value="<?php echo !$recordSaved && isset($microphones) ? $microphones : 0; ?>" class="form-control">
</div>
<div class="form-group">
<label for="amplifiers">Amplifiers</label>
<input type="number" name="amplifiers" value="<?php echo !$recordSaved && isset($amplifiers) ? $amplifiers : 0; ?>" class="form-control">
</div>
<div class="form-group">
<label for="loudspeakers">Loudspeakers</label>
<input type="number" name="loudspeakers" value="<?php echo !$recordSaved && isset($loudspeakers) ? $loudspeakers : 0; ?>" class="form-control">
</div>
<div class="form-group">
<label for="mixers">Mixers</label>
<input type="number" name="mixers" value="<?php echo !$recordSaved && isset($mixers) ? $mixers : 0; ?>" class="form-control">
</div>
<div class="form-group">
<label for="catatan">Catatan *</label>
<textarea name="catatan" placeholder="Complete catatan..." rows="3" class="form-control"><?php echo !$recordSaved && isset($catatan) ? $catatan : ''; ?></textarea>
</div>
<div class="form-group">
<label for="n_anjuran">Dept/Kelab/Anjuran *</label>
<select name="n_anjuran" class="form-control">
<option value="">- SILA PILIH -</option>
<?php
if ($n_anjuranItems) {
foreach ($n_anjuranItems as $n_anjuranItem) {
$selected = (!$recordSaved && isset($n_anjuran) && $n_anjuran == $n_anjuranItem['kd_dept']) ? 'selected' : '';
?>
<option value="<?php echo $n_anjuranItem['kd_dept']; ?>" <?php echo $selected; ?>>
<?php echo $n_anjuranItem['desc_dept']; ?>
</option>
<?php
}
}
?>
</select>
</div>
<div class="form-group text-center">
<button type="submit" id="submitButton" name="submitButton" class="btn btn-success" aria-label="Submit" title="Submit">
<i class="fa fa-check" aria-hidden="true"></i> Submit
</button>
</div>
</form>
</div>
</div>
</div>
</body>
</html>
CREATE TABLE `pasystems` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`trn_date` varchar(100) DEFAULT NULL,
`microphones` int(11) DEFAULT NULL,
`amplifiers` int(11) DEFAULT NULL,
`loudspeakers` int(11) DEFAULT NULL,
`mixers` int(11) DEFAULT NULL,
`catatan` varchar(100) DEFAULT NULL,
`n_anjuran` int(11) DEFAULT NULL,
`submittedby` varchar(100) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `koddept` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`kd_dept` int(11) DEFAULT NULL,
`desc_dept` varchar(100) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
INSERT INTO `koddept` (`id`, `kd_dept`, `desc_dept`)
VALUES
(1,1,'my dept 1'),
(2,2,'my dept 2');