Validate user input

Question

how can i validate a question made with input type radio using JS or PHP?
please help

Answer 1

here are some links that might be helpful to you:
http://www.google.com/url?sa=t&source=web&cd=3&ved=0ahUKEwjoiqeBjbvQAhVD2GMKHQJdCz8QFgggMAI&url=http%3A%2F%2Fstackoverflow.com%2Fquestions%2F27149332%2Fhtml-form-inside-php-tag-radio-button-validation&usg=AFQjCNFADOu1UEXzhyUr9veNrwMWBZ5szQ

http://www.google.com/url?sa=t&source=web&cd=2&ved=0ahUKEwjoiqeBjbvQAhVD2GMKHQJdCz8QFggdMAE&url=http%3A%2F%2Fstackoverflow.com%2Fquestions%2F20753757%2Fi-have-to-validate-my-form-for-radio-buttons-using-javascript-for-my-code-given&usg=AFQjCNH5cxjgheVezrDmoMprQSj4if-tIg

http://www.google.com/url?sa=t&source=web&cd=1&ved=0ahUKEwjoiqeBjbvQAhVD2GMKHQJdCz8QFggaMAA&url=http%3A%2F%2Fstackoverflow.com%2Fquestions%2F19312459%2Fadding-validations-to-see-if-radio-button-is-not-selected&usg=AFQjCNGytPsD3MGEmfY6BSQUDYbHdcCMTQ