#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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