如何在php html中的数据库mysql中插入记录

Question

注意：未定义的索引：第13行的C：\\ xampp \\ htdocs \\ sekolah \\ admin \\ insert.php中的nama

注意：未定义索引：第14行的C：\\ xampp \\ htdocs \\ sekolah \\ admin \\ insert.php中的nis

<?php
/* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting (user 'root' with no password) */
$link = mysqli_connect("localhost", "root", "root", "school");

// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}

// Escape user inputs for security
$sekolah = mysqli_real_escape_string($link, $_POST['sekolah']);
$nama = mysqli_real_escape_string($link, $_POST['nama']);
$kelas = mysqli_real_escape_string($link, $_POST['nis']);

// attempt insert query execution
$sql = "INSERT INTO sekolah (sekolah, nama, nis) VALUES ('$sekolah', '$nama', '$nis')";
if(mysqli_query($link, $sql)){
    echo "Records added successfully.";
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}

// close connection
mysqli_close($link);
?>

Answer 1

if($link === false){
die("ERROR: Could not connect. " . mysqli_connect_error());
}
@$sekolah = mysqli_real_escape_string($link, $_POST['sekolah']);
@$nama = mysqli_real_escape_string($link, $_POST['nama']);
@$kelas = mysqli_real_escape_string($link, $_POST['nis']);
$sql = "INSERT INTO sekolah (sekolah, nama, nis) VALUES ('$sekolah', '$nama', '$nis')";
if(mysqli_query($link, $sql)){
echo "Records added successfully.";
} else{
echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
mysqli_close($link);
?>

在变量前加上@，因为在localhost中会出现未定义的索引错误。

Answer 2

未定义索引意味着，在$ _POST数组中，键nama和nis没有索引（键）。 尝试访问它之前检查该值是否已设置会更安全：

使用isset($_POST['nama'])检查该变量是否存在：