POST数据未推送到POST数组

Question

I am saving content items with a title and content value in a database. In my example you can see that I have one item for creating a new content item and the earlier saved items.

I save the items in a multidimensional array by adding the index in each input's name field like <input name="extra[2][title]"> (see example).

For the creating fields I try to store a new item with a new key by doing <input name="extra[][title]">, which normally pushes a new item to the end of an array. But when I print out the POST data the new item is not there, so I cannot store it in the array with the other items.

HTML FORM:

<form method="post">

    <!-- This is for creating a new item -->
    <div class="item">
        <input type="text" name="extra[][title]">
        <input type="text" name="extra[][content]">
    </div><!--End .item-->


    <!-- Items from array -->
    <?php
    $extras = array( /* Earlier saved items */ );
    foreach( $extras as $index => $extra ) { ?>

        <div class="item">
            <input type="text" name="extra[<?php echo $index; ?>][title]">
            <input type="text" name="extra[<?php echo $index; ?>][content]">
        </div><!--End .item-->

    <?php   
    }
    ?>

    <input type="submit" name="submit">

</form>

After doing this, the new item is not there:

<?php
if( ! empty( $_POST['extra'] ) ) {

    echo '<pre>';
    print_r( $_POST['extra'] );
    echo '</pre>';

}
?>

print_r( $_POST ) returns:

Array
(
    [extra] => Array
        (
            [0] => Array
                (
                    [title] => Test 1
                    [content] => test content
                )

            [1] => Array
                (
                    [content] => test content
                    [title] => Test 2
                )

            [2] => Array
                (
                    [title] => Test 3
                    [content] => test content
                )

        )

    [submit] => submit
)

Answer 1

With the help of RiggsFolly, I created this solution, which is very simple.

I changed the form html to this:

<form method="post">

    <!-- This is for creating a new item -->
    <div class="item">
        <input type="text" name="extra_title[]">
        <input type="text" name="extra_content[]">
    </div><!--End .item-->


    <!-- Items from array -->
    <?php
    $extras = array( 
        array(
            'title' => 'Test 1',
            'content' => 'test content'
        ),
        array(
            'title' => 'Test 2',
            'content' => 'test content'
        ),
        array(
            'title' => 'Test 3',
            'content' => 'test content'
        )


    );
    foreach( $extras as $index => $extra ) { ?>

        <div class="item">
            <input type="text" name="extra_content[]" value="<?php echo $extra['title']; ?>">
            <input type="text" name="extra_title[]" value="<?php echo $extra['content']; ?>">
        </div><!--End .item-->

    <?php   
    }
    ?>

    <input type="submit" name="submit" value="submit">

</form>

The POST outputs this:

Array
(
    [extra_title] => Array
        (
            [0] => Test 4
            [1] => Test 1
            [2] => Test 2
            [3] => Test 3
        )

    [extra_content] => Array
        (
            [0] => Tkldmsd
            [1] => test content
            [2] => test content
            [3] => test content
        )

    [submit] => submit
)

And then you can combine those values by index as follows:

<?php
if( ! empty( $_POST ) ) {

    echo '<pre>';
    print_r( $_POST );
    echo '</pre>';

    if( ! empty( $_POST['extra_title'] ) && ! empty( $_POST['extra_content'] ) ) {

        $extra = array();

        foreach( $_POST['extra_title'] as $index => $title ) {

            $extra[$index] = array(
                'title' => $title,
                'content' => $_POST['extra_content'][$index]
            );

        }


    }

}
?>