Discuss how to pass arrays using POST in PHP

When developing web applications, different data types need to be passed when interacting with the client. One of them is arrays. As a multi-object-oriented programming language, PHP provides multiple ways to receive and transfer array data. In this article, we will discuss how to pass arrays using POST method in PHP.

1. The principle of post passing array

POST is a method in HTML forms. It can send data in the form to the server, such as user input, selected values, etc. Therefore, this data can be received and processed through server scripts. In PHP, you can use the $_POST array to get form data. $_POST is a global array that can be used anywhere in the script. It receives form data in the form of name/value pairs, where name is the name of the form element and value is the filled-in data. This means that a name can be used to get data with the corresponding name.

2. Pass single-layer array

For single-layer arrays, they can be passed by naming the array elements in the form. Below is an example form that uses the POST method to pass a single-level array named "fruits":

<form method="POST" action="submit.php">
  <input type="checkbox" name="fruits[]" value="apple"> Apple<br>
  <input type="checkbox" name="fruits[]" value="banana"> Banana<br>
  <input type="checkbox" name="fruits[]" value="orange"> Orange<br>
  <input type="submit" name="submit" value="Submit">
</form>

In the PHP script, we will use the $_POST method to access this data. We can use a foreach loop to iterate over a single array and use its keys or values:

<?php
if (isset($_POST["fruits"])) {
  foreach($_POST["fruits"] as $fruit) {
    echo $fruit."<br>";
  }
}
?>

Specified by using """" in the form element name These elements are arrays, and the array elements in the "" here will be automatically populated and used to store the entered data.

3. Pass multi-level arrays

For multi-level arrays, you can use "["][]" to name the array elements , and use """" to pass multi-level arrays to the server. Here is a sample form using the POST method to pass a multi-layered array named "fruits":

<form method="POST" action="submit.php">
  <input type="text" name="fruits[0][name]" value="apple"><br>
  <input type="text" name="fruits[0][color]" value="red"><br>
  <input type="text" name="fruits[1][name]" value="banana"><br>
  <input type="text" name="fruits[1][color]" value="yellow"><br>
  <input type="text" name="fruits[2][name]" value="orange"><br>
  <input type="text" name="fruits[2][color]" value="orange"><br>
  <input type="submit" name="submit" value="Submit">
</form>

Get this multi-layered array in a PHP script:

<?php
if (isset($_POST["fruits"])) {
  foreach($_POST["fruits"] as $fruit) {
    echo $fruit["name"]." is ".$fruit["color"]."<br>";
  }
}
?>

In the form element Using """ in the name will pass multi-level arrays in PHP scripts. Therefore, when using names ending with "", you should follow the structure of multi-level arrays.

4. Conclusion

Through this article, we learned how to use POST to pass arrays in PHP. You can use """" to name form elements and pass data to the server. This data can be accessed using the $_POST method, with the ability to iterate through multiple levels of the array to obtain the correct data.

For PHP programmers, passing arrays is very important because they make data processing more flexible and convenient. Hopefully this article was helpful and you now understand how to pass PHP arrays using POST method.

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