How to convert a form into an array in PHP and perform addition, deletion and modification operations

With the development of Internet technology, the functions of network applications are becoming more and more powerful. Among them, the application of forms occupies a very important position in web pages. In web pages, forms allow users to enter and submit information to achieve the purpose of information transmission. PHP also provides powerful form processing functions, which can flexibly add, delete, and modify data.

This article will introduce how to use PHP to convert the form into an array and perform addition, deletion and modification operations.

1. Convert form data into an array

In PHP, the value submitted by the form can be obtained by using the $_POST super global array. However, $_POST is a one-dimensional associative array, and it will be inconvenient to process multi-dimensional arrays. Therefore, $_POST needs to be converted into an array.

PHP provides two methods to convert form data into arrays:

1. Use array_values ​​and array_combine functions

array_values ​​is to convert the value of the array as The value of the array is returned, and array_combine can combine two arrays into a new associative array. We can first return the value of the $_POST array data through the array_values ​​function, and suffix the key value of the new array (for example, add an underscore and a number after the key value), and then use the array_combine function to combine the key value with The array is merged with the original array to generate a new array.

The following is a code example:

$keys = array_values($_POST);
$count = count($keys);
for($i = 0; $i < $count; $i++) {
    $keys[$i] = $keys[$i] . '_' . $i;
}
$post = array_combine($keys, $_POST);

2. Use the serialize function

The serialize function serializes a variable into a string to facilitate storage and transmission . When converting form data to an array, we can use the serialize function to serialize $_POST, and then use unserialize to deserialize it into an array.

The following is a code example:

$post = unserialize(serialize($_POST));

Both methods can successfully convert form data into an array. Which method to use depends on the developer's habits and needs.

2. Implement form addition, deletion and modification operations

After converting the form data into an array, we can flexibly perform addition, deletion and modification operations. Next, we will introduce three methods of adding data, modifying data, and deleting data.

1. Add data

The data submitted in the form is not required to be inserted into the database. We can save the data in an array first and format it. . This can not only achieve fast storage and reading, but also avoid frequent operations on the database.

The following is a simple sample code for saving submitted form data (such as name, age, gender) into an array, and setting a primary key ID.

$post = array();  // 初始化空数组

if (!empty($_POST['name'])) {  // name字段非空时才写入数组
    $newId = max(array_keys($post)) + 1;  // 自动生成主键ID
    $post[$newId]['name'] = $_POST['name'];
    $post[$newId]['age'] = $_POST['age'];
    $post[$newId]['sex'] = $_POST['sex'];
}

2. Modify data

In the data submitted by the form, some items may need to be modified. We can find the data that needs to be modified based on the primary key ID and modify it. The following is a sample code:

if (!empty($_POST['id']) && isset($post[$_POST['id']])) {
    $id = $_POST['id'];
    $post[$id]['name'] = $_POST['name'];
    $post[$id]['age'] = $_POST['age'];
    $post[$id]['sex'] = $_POST['sex'];
}

3. Delete data

Sometimes, we need to remove unnecessary data. We can delete the corresponding data based on the primary key ID. The following is a sample code:

if (!empty($_POST['id']) && isset($post[$_POST['id']])) {
    unset($post[$_POST['id']]);
}

Through the above three operations, we can add, delete, and modify data in the form. It should be noted that since we store data in an array, we need to manually write data persistence code, such as storing the data in the array to a database or text file.

3. Summary

This article mainly introduces the method of converting form data into arrays, and implementing addition, deletion and modification operations through arrays. Through the introduction of this article, we can see that PHP provides many mature basic functions to simplify our data processing. At the same time, for data storage, we also need to consider how to prevent data loss and data leakage.

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