检查基于php变量的单选按钮

Question

I am able to set the value of a text field from a php variable so that when the page is refreshed, the text field remains filled in like so:

<td><input type="text" name="user" value="<?php echo ($_REQUEST['user']); ?>" /></td>

However, I would like to do the same for a radio button with a different variable, $gender. How could I do this?

<td><input type="radio" name="gender" value="male"> Male<br>
                    <input type="radio" name="gender" value="female"> Female<br>
                    <input type="radio" name="gender" value="other"> Other</td>

</div>

Answer 1

This is called a ternary operator

<?php

'<td><input type="radio" name="gender" value="male" '.($_REQUEST['gender'] == "male" ? 'checked' : '').'> Male<br>
     <input type="radio" name="gender" value="female" '.($_REQUEST['gender'] == "female" ? 'checked' : '').'> Female<br>
     <input type="radio" name="gender" value="other" '.($_REQUEST['gender'] == "other" ? 'checked' : '').'> Other</td>'

?>