How can get unchecked checkbox in PHP?

If you check a checkbox and post a form you will get the value of the checkbox in the $_POST variable which you can use to process a form, if it’s unchecked no value will be added to the $_POST variable. In PHP you would normally get around this problem by doing an isset() check on your checkbox element.

What is the value of unchecked checkbox?

Note: If a checkbox is unchecked when its form is submitted, there is no value submitted to the server to represent its unchecked state (e.g. value=unchecked ); the value is not submitted to the server at all.

What is checkbox value if not checked?

If a checkbox is unchecked, it doesn’t get sent, so setting it’s value to 0 if it isn’t checked isn’t going to help – it will always return NULL.

How do you send a zero if a checkbox is unchecked?

Inputs need to have the same name. If the checkbox is checked then value 1 will be submitted, otherwise value 0 from the hidden input. I used a ternary operator to set the value on checked and unchecked condition.

How to get checked checkboxes value in PHP?

When you use it in your form and try to read all checked values as any other elements like – text box, text area, radio button etc. you will get the last checked value. You need to send the checkboxes value in the form of an Array when the form gets submitted then you can loop over $_POST values.

How to post unchecked HTML checkboxes Stack Overflow?

POST unchecked HTML checkboxes Ask Question Asked11 years, 6 months ago Active1 month ago Viewed432k times 332 76 I’ve got a load of checkboxes that are checked by default. My users will probably uncheck a few (if any) of the checkboxes and leave the rest checked.

Why do I not get value of checkbox?

The problem with checkboxes is that if they are not checked then they are not posted with your form. If you check a checkbox and post a form you will get the value of the checkbox in the $_POST variable which you can use to process a form, if it’s unchecked no value will be added to the $_POST variable.

What does null mean for checkbox in PHP?

1) Assume a NULL in the PHP params means the checkbox is unchecked. If the checkbox doesn’t always exist on the page, this could be problematic. By the sounds of it, there is a variable number of checkboxes, so this probably won’t work. 2) Add a hidden input that has the same name as the checkbox with the value of 0 BEFORE the checkbox.