从表单中将动态生成的$ _POST值插入到php中的mysql中

Question

I'm trying currently to insert back into a database values from my form.

 <?php do { ?>
  <tr>
    <td><?php echo $row_questions['question']; ?><br /><table><tr><td style=

    "padding:15px; text-align:center">
      <label>
        <center><input type="radio" name="answers_<?php echo $row_questions['id']; ?>_<?php echo $row_questions['sub_category']; ?>" value="1" id="answers_1" /></center><br />
        Low</label>
      </td><td style="padding:15px; text-align:center">
      <label>
        <center><input type="radio" name="answers_<?php echo $row_questions['id']; ?>_<?php echo $row_questions['sub_category']; ?>" value="2" id="answers_2" /></center><br />
        Fairly Low</label>
      </td><td style="padding:15px; text-align:center">
      <label>
        <center><input type="radio" name="answers_<?php echo $row_questions['id']; ?>_<?php echo $row_questions['sub_category']; ?>" value="3" id="answers_3" /></center><br />
        Average</label>
      </td><td style="padding:15px; text-align:center">
      <label>
        <center><input type="radio" name="answers_<?php echo $row_questions['id']; ?>_<?php echo $row_questions['sub_category']; ?>" value="4" id="answers_4" /></center><br />
        Fairly High </label>
      </td><td style="padding:15px; text-align:center">
      <label>
        <center><input type="radio" name="answers_<?php echo $row_questions['id']; ?>_<?php echo $row_questions['sub_category']; ?>" value="5" id="answers_5" /></center><br />
        High</label>
      </td></tr></table><br />
  </tr>
  <?php } while ($row_questions = mysql_fetch_assoc($questions)); ?>

the form gets the questions from a table in my database (called questions). they are in three categories and only one categories set of questions is pulled at any one time.

I need to insert each answer individually into another table (called user_answers).

I'm having trouble working out quite how to go about this and it's beginning to do my head in!

the form manages to pass through $_POST a value that when I print_r($_POST); I get

Array ( [answers_90_5] => 3 [answers_91_5] => 3 )

With 90 & 91 being the question ids and 5 being the subcategory in both instances.

From here I am stumped.

How do I identify these parts of each individual post along with the answer and insert them as a row each in the table?

I'm fine with doing the MySQL insert normally and a standard form passing values etc. but I'm completely stumped on how to do this!

Many thanks in advance!

Answer 1

Using a multi-dimensional array should ease your job of iteration:

<input 
    type="radio" 
    name="answers[<?php echo $row_questions['id']; ?>][<?php echo $row_questions['sub_category']; ?>]" 
    value="1" 
    id="answers_<?php echo $row_questions['id'] . '_' . $row_questions['sub_category']; ?>" />

Debugging this should give you $_POST filled with a array of the likes:

Array ( [answers] => Array(
     90 => Array ( 5 => 3 ),
     91 => Array ( 5 => 3 ),
))

Answer 2

sure, separate your queries, post val one and sub cat one for query 1, and query 2 do the same for cat 2 and sub cat two.

very simple.

Answer 3

I think the other answer suggesting multi-dim arrays makes a lot of sense. Thought I would still provide an example on how to parse the string though. It could be something as simple as:

foreach ($post as $k => $v) {
    $parts = explode('_', $k);
    $questionId = $parts[1];            
    $questionCategoryId = $parts[2];    
    $sql = "INSERT INTO answers (questionId, subCategoryId, answerValue ) VALUES ($questionId, $questionCategoryId, $v)";

    ....
}

... only hopefully with better escaping on the POST data.