PHP使用POST信息创建表，循环遍历填充的变量

Question

I have the following post variables:

$line_1_09
$line_1_12
$line_1_15
$line_1_18
$line_1_21
$line_2_09
$line_2_12
$line_2_15
$line_2_18
$line_2_21
$line_3_09
$line_3_12
$line_3_15
$line_3_18
$line_3_21

I know from my previous form that of the 15 inputs(posts) 12 are populated. the 12 is stored in variable $populatedrows.

I then want to create a table on my new page

<table>
<?php for ($i=1; $i<=$populatedrows; $i++)
  {
?>
    <tr>
       <td>
         <input type="text" value="//first post with information//">
       </td>
    </tr>
<?php } ?>
</table>

so in this example, if $line_1_09 and $line_1_12 are empty, the first table row input must then be $line_1_15

and so it will continue 'looping' through the next available / populated post variables until the table is equal to $populatedrows. this will be equal to the number of post variables that contain data.

Strange situation for me so not really sure how to go about it.

Answer 1

In case you just want to create input for each not empty $_POST variable:

    <?php
    foreach($_POST as $key => $value) //$key is e.g 'line_1_20'
    {
        // substr($key, 0, 5) == 'line_' checks if the $key starts with 'line_'
        if((substr($key, 0, 5) == 'line_') && !empty($value))
        {
        ?>
            <tr>
                <td>
                  <input type="text" value="<?php echo $value ?>">
                </td>
            </tr>
        <?php
        }
    }
    ?>

If you want less then all populated $_POST:

    <?php
    $count = 0; //count rendered fields
    foreach($_POST as $value)
    {
        if(!empty($value))
        {
        ?>
            <tr>
                <td>
                  <input type="text" value="<?php echo $value ?>">
                </td>
            </tr>
        <?php
        $count++; //increase counter
        }

        if($count == $populatedrows) //if the coutner hits the requested amount break the loop
            break;
    }
    ?>