How to determine whether Radio is selected in PHP?

#How does PHP determine whether Radio is selected?

First set the value of the Radio element to 1;

Then receive the requested data in the PHP code;

Then determine whether there is any in the received data Radio data, if it exists, select it;

$data = $_POST;

if (isset($data['radio_name'])) {
  //选中
} else {
    //未选中
}

Finally determine whether the selected value is the set value, if not, it is not selected.

$data = $_POST;

if (isset($data['radio_name'] && $data['radio_name'] == 1)) {
  //选中
} else {
    //未选中
}

Recommended tutorial: "PHP Tutorial"

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