我在网站上工作时遇到参数错误。我不知道如何绕过，以及如何将数组添加到此代码中的复选框。我收到以下错误代码
警告：mysqli_stmt_close（）期望参数1为mysqli_stmt，在第42行的C：\ xampp \ htdocs \ formnew.php中给出的布尔值
警告：trim（）期望参数1为字符串，数组位于C：\ xampp \ htdocs \ formnew.php，第55行
我的代码如下
<?php
// Include config file
require_once "config.php";
// Define variables and initialize with empty values
$name = $id = $checkbox = "";
$name_err = $id_err = $checkbox_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Validate username
if(empty(trim($_POST["name"]))){
$username_err = "Please enter your name.";
} else{
// Prepare a select statement
$sql = "SELECT FROM form WHERE name = ?";
if($stmt = mysqli_prepare($link, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_name);
// Set parameters
$param_name = trim($_POST["name"]);
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
/* store result */
mysqli_stmt_store_result($stmt);
if(mysqli_stmt_num_rows($stmt) == 1){
$name_err = "you've already submitted a request.";
} else{
$name = trim($_POST["name"]);
}
} else{
echo "Oops! Something went wrong. Please try again later.";
}
}
// Close statement
mysqli_stmt_close($stmt);
}
// Validate id
if(empty(trim($_POST["id"]))){
$password_err = "Please enter your ID.";
} elseif(strlen(trim($_POST["id"])) < 7){
$id_err = "Please enter your full student ID.";
} else{
$id = trim($_POST["id"]);
}
// checkbox
if(empty(trim($_POST["checkbox"]))){
$checkbox_err = "Please select trips.";
} else{
$checkbox = trim($_POST["checkbox"]);
}
// Check input errors before inserting in database
if(empty($name_err) && empty($id_err) && empty($checkbox_err)){
// Prepare an insert statement
$sql = "INSERT INTO users (name, id, checkbox) VALUES (?, ?, ?)";
if($stmt = mysqli_prepare($link, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "sss", $param_name, $param_id, $param_checkbox);
// Set parameters
$param_name = $name;
$param_id = $id;
$param_checkbox = $checkbox;
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
// Redirect to login page
header("location: form.php");
} else{
echo "Something went wrong. Please try again later.";
}
}
// Close statement
mysqli_stmt_close($stmt);
}
// Close connection
mysqli_close($link);
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Sign Up</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
<style type="text/css">
body{ font: 14px sans-serif; }
.wrapper{ width: 350px; padding: 20px; }
</style>
</head>
<body>
<div class="wrapper">
<h2>Sign Up</h2>
<p>Please fill this form to create an account.</p>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
<div class="form-group <?php echo (!empty($name_err)) ? 'has-error' : ''; ?>">
<label>Name</label>
<input type="text" name="name" class="form-control" value="<?php echo $name; ?>">
<span class="help-block"><?php echo $name_err; ?></span>
</div>
<div class="form-group <?php echo (!empty($id_err)) ? 'has-error' : ''; ?>">
<label>Student ID</label>
<input type="text" name="id" class="form-control" value="<?php echo $id; ?>">
<span class="help-block"><?php echo $id_err; ?></span>
</div>
<div class="form-group <?php echo (!empty($checkbox_err)) ? 'has-error' : ''; ?>">
<label>Trips</label>
<input type="checkbox" name="checkbox[]" class="form-control" value="<?php echo $test1; ?>">
<input type="checkbox" name="checkbox[]" class="form-control" value="<?php echo $test2; ?>">
<input type="checkbox" name="checkbox[]" class="form-control" value="<?php echo $test3; ?>">
<input type="checkbox" name="checkbox[]" class="form-control" value="<?php echo $test4; ?>">
<input type="checkbox" name="checkbox[]" class="form-control" value="<?php echo $test5; ?>">
<span class="help-block"><?php echo $checkbox_err; ?></span>
</div>
<div class="form-group">
<input type="submit" class="btn btn-primary" value="Submit">
<input type="reset" class="btn btn-default" value="Reset">
</div>
</form>
</div>
</body>
</html>
并且我的sql表设置为
Name - ID - Checkbox with the parameters being varchar(50)
将mysqli_stmt_close()放入if块中，因此仅当mysqli_prepare()成功时才执行。
并且如果mysqli调用失败，您应该显示或记录错误消息，而不仅仅是“糟糕”。
if($stmt = mysqli_prepare($link, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_name);
// Set parameters
$param_name = trim($_POST["name"]);
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
/* store result */
mysqli_stmt_store_result($stmt);
if(mysqli_stmt_num_rows($stmt) == 1){
$name_err = "you've already submitted a request.";
} else{
$name = trim($_POST["name"]);
}
} else{
echo "Execute query error: " . mysqli_stmt_error($stmt);
}
// Close statement
mysqli_stmt_close($stmt);
} else {
echo "Prepare statement error: " . mysqli_error($link);
}