How to enter array id from php form

PHP is a very popular web programming language with many powerful features for creating interactive web applications and dynamic websites. Among them, processing forms is one of the important functions of PHP.

In web development, we often need to let users enter data through forms and process it in the background. Sometimes we need to let users enter array type data. How to handle this situation in PHP? This article will introduce how to enter an array id through a form.

1. What is an array

In computer science, an array is a data structure that can store many data of the same type. Usually the index of an array is a sequence of integers starting from 0, with each index corresponding to a value. Arrays in PHP can contain different types of values ​​such as strings, numbers, and other arrays, etc.

2. Enter the array id in the form

In web applications, we often need to collect data from users. Forms are the most commonly used method. Among them, if we need to let the user enter a set of data, we can let the user enter the array ID through the form.

The following is a basic form for users to input array type data:

<form method="POST" action="process.php">
    <p>请输入你喜欢的书籍：</p>
    <input type="text" name="book[]" /><br>
    <input type="text" name="book[]" /><br>
    <input type="text" name="book[]" /><br>
    <input type="submit" name="submit" value="提交" />
</form>

In this form, we use book[] as the input box name. This array syntax tells the browser that the value of this input box will be combined into an array and transmitted to the server, rather than a single value.

If you want the user to input more data, you can add more input tags at the end, each tag is an array item.

3. Processing the input array id in PHP

There are many ways to process form data in PHP. We can use GET or POSTMethod to submit data. Here, we use the POST method to process the data.

First, we need to get the form data through the $_POST array:

$bookList = $_POST['book'];

In this way, the data in the form is stored in the $bookList array . Next, we can iterate through this array and output each element to the browser, or store it in a database.

foreach ($bookList as $book) {
    echo $book . "<br>";
}

If you want to store this data in the database, you can use SQL statements to insert the data into the database table.

$sql = "INSERT INTO books (book_name) VALUES ";
$bookValues = array();
foreach ($bookList as $book) {
    $bookValues[] = "('" . $book . "')";
}
$sql .= implode(",", $bookValues);
$db->query($sql);

This line of code means to insert each element in the $bookList array into the book_name field of the books table.

4. Summary

This article introduces how to input array ids through forms and process them in PHP. In this way, we can make it more convenient for users to enter a set of data and process it in the background, making our web applications more powerful and useful. Let's make full use of the form processing capabilities in PHP to its greatest advantage and create beautiful web applications.

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