What does checked mean in php

The checked attribute in PHP is used to indicate the checked status of a check box or radio button. It is used for: initializing the checked status, changing the checked status, getting the checked status attribute value: true (checked), false (unchecked) Example ：<input type="checkbox" checked>(checked)

checked attribute in PHP

checked is an attribute used in PHP for check boxes and radio buttons. Its function is to indicate whether the check box or radio button has been checked.

Application scenarios:

The checked attribute is used in the following scenarios:

• Initialize the checked state of the check box or radio button
• Change the selected state of a check box or radio button through user interaction (such as clicking)
• Get the current selected state of a check box or radio button

Attribute value:

The checked attribute only accepts two values:

• true: indicates that the check box or radio button has been Checked
• false: means the check box or radio button is not selected

Usage example:

The following Example to create a checked checkbox:

<input type="checkbox" checked>

The following example uses PHP code to get the selected status of the checkbox:

<?php
$isChecked = isset($_POST['checkbox']) && $_POST['checkbox'] == 'on';
?>

Note:

Unlike the checked attribute in JavaScript, the checked attribute in PHP does not affect form submission. This means that checking or unchecking a checkbox or radio button will not change the checked state of these elements after the form is submitted.

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