简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Home> Backend Development> PHP Tutorial> body text

PHP form processing: check box and multi-select box data processing

WBOY
Release： 2023-08-07 11:10:01
Original
1966 people have browsed it

PHP form processing: check box and multi-select box data processing

In web development, forms are one of the important components for interacting with users. Checkboxes and multi-select boxes are commonly used elements in forms, allowing users to select multiple options. This article will introduce how to process check box and multi-select box data in PHP.

  1. Checkbox handling

A checkbox is a form element that allows the user to select one or more options. In PHP, we can get the data submitted by the form through the $_POST or $_GET global array. For check boxes, if the user checks the option, the corresponding value will be included in this array; if the user does not check the option, the value will not appear in the array. The following is a sample code for processing check boxes:

  Apple  Banana  Orange
Copy after login

In the above example, we specify the same name attribute for the check box and add a [] after the attribute to indicate that this is an array. When the user submits the form, the checked checkboxes are passed to the server in the form of an array. We can use a foreach loop to iterate through this array and process each option:

"; } } ?>
Copy after login

The above code first uses the isset function to check whether $_POST['fruits'] exists to prevent undefined variable errors. . We then store the selected fruits in the $selectedFruits variable and use a foreach loop to iterate through the array and output the value of each option.

  1. Multi-select box processing

A multi-select box is a form element that allows the user to select one or more options, similar to a check box. Handling multi-select boxes in PHP is similar to handling check boxes. We also obtain the data submitted by the form through the $_POST or $_GET global array. The following is a sample code for processing a multi-select box:
Copy after login

In the above example, we added the multiple attribute to the