How to accept form array in php

In PHP, a form can not only submit a single data, but also submit multiple data in the form of an array. When dealing with this situation, we need to use some of PHP's built-in functions to receive and process these arrays. This article will introduce how to use PHP to receive and process form arrays.

First, let's take a look at how to submit an array in the form:

<form action="submit.php" method="post">
  <input type="text" name="name[]" value="Alice">
  <input type="text" name="name[]" value="Bob">
  <input type="text" name="name[]" value="Charlie">
  <input type="submit" name="submit" value="Submit">
</form>

In the above form, we have used the same name "name" in the name attribute of each input field []", which means that the values ​​of these input fields will be submitted as an array named "name".

Next, we need to receive this array in the PHP file. We can use the $_POST array to get this array and use PHP built-in functions to process it. Let's look at a few examples.

Get the entire array

If you want to get the entire submitted array, you can use the $_POST array to get it. In the above example, we can use the following code to get the entire array:

$name_array = $_POST['name'];

Here, we assign the submitted name array to the variable $name_array. Now, $name_array will contain all values ​​submitted. If you want to see the contents of this array, you can use the print_r function:

print_r($name_array);

This will output the following:

Array
(
    [0] => Alice
    [1] => Bob
    [2] => Charlie
)

Get a specific array element

If you want To get a specific element of the submitted array, you can use a subscript to get it. For example, if you want to get the first element of an array, you can use the following syntax:

$first_element = $_POST['name'][0];

Here, we use subscript "0" to get the first element of the array. Likewise, you can use other subscripts to get any element of the submission.

Loop through the array

If you want to traverse and process the entire array, you can use PHP's built-in foreach statement. The following is a sample code:

foreach ($_POST['name'] as $name) {
  echo $name . "<br>";
}

Here, we use the foreach statement to iterate through the array named "name" and assign each element to the variable $name. In this example, we are simply outputting the value of each element, but you can use any regular PHP code in a foreach statement to manipulate the array.

Conclusion

As mentioned above, receiving and processing form arrays using PHP is very simple. You can use $_POST array to get the array and use PHP built-in functions to process it. Whether you want to get the entire array or specific array elements, or iterate through and process the entire array, PHP provides a variety of methods to meet your needs.

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