In this example, the value of the for attribute of the element is the same as the value of the id attribute of the checkbox. Therefore, you should always use a checkbox with a element like this: I agree Code language: HTML, XML ( xml ) The filter_has_var() function returns true if the checkbox_name exists in the INPUT_POST.Ī checkbox has no label. To check if a checkbox is checked, you can also use the filter_has_var() function like this: if(filter_has_var(INPUT_POST, 'checkbox_name')) Code language: JavaScript ( javascript ) It means that the following expression returns false: isset($_POST) Code language: PHP ( php ) However, if you uncheck the checkbox and submit the form, the $_POST won’t have any element with key checkbox_name. echo $_POST // 'checkbox_value' Code language: PHP ( php ) If you check the checkbox and submit the form using the POST method, the $_POST associative array will contain an element whose key is checkbox_name and value is checkbox_value. To create a checkbox, you use the input element with the type checkbox as follows: Code language: HTML, XML ( xml )Ī checkbox has two states: checked and unchecked. A quick introduction to the checkbox elementĪ checkbox allows you to select a single value for submission in a form. Summary: in this tutorial, you will learn how to use PHP to process a form with one or more checkboxes.
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