Assigning a value to a radio, select or checkbox input with PHP


I've got a registration form. When users submit the form after entering an invalid coupon code, the page reloads and I show the form again with all the data they entered. It's easy with input fields but I can't think of a simple way to do the same with radio, checkboxes and selects.

For example I have :

<input type="radio" name="gender" value="male" /> <input type="radio" name="gender" value="female" />

I have my PHP variable $gender that contains 'male'. But how to have the radio with 'male' selected?

Same question with my selects and checkboxes.


For a small number of options you could use a ternary operator like this.

<input type="radio" name="gender" value="male" <?php echo ($gender == 'male') : 'selected="selected"' : '';?> /> <input type="radio" name="gender" value="female" <?php echo ($gender == 'female') : 'selected="selected"' : '';?> />

Not the most subtle way but it will work. For more complicated situations its advisable to use a DOM parser like <a href="http://php.net/manual/en/class.domdocument.php" rel="nofollow">DOMDocument</a> etc.


//retrive gender and checkbox value in edit form $gender=$row['gender']; $chkhobby=$row['chkhobby']; <tr> <th>GENDER</th> <td> Male<input type="radio" name="gender" value="1" <?php echo ($gender== '1') ? "checked" : "" ; ?>/> Female<input type="radio" name="gender" value="0" <?php echo ($gender== '0') ? "checked" : "" ; ?>/> </td> </tr> <tr> <th>Hobbies</th> <td> <pre><?php //print_r($row); $hby = @explode(",",$row['chkhobby']); //print_r($hby); ?></pre> read<input id="check_1" type="checkbox" name="chkhobby[]" value="read" <?php if(in_array("read",$hby)){?> checked="checked"<?php }?>> write<input id="check_2" type="checkbox" name="chkhobby[]" value="write" <?php if(in_array("write",$hby)){?> checked="checked"<?php }?>> play<input id="check_4" type="checkbox" name="chkhobby[]" value="play" <?php if(in_array("play",$hby)){?> checked="checked"<?php }?>> </td> </tr> //update $gender=$_POST['gender']; $chkhobby = implode(',', $_POST['chkhobby']);


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