将PHP数组名称转换为字符串的最佳方法

Question

I have an HTML table, linked to PHP $_SESSION data, to which I wish to add a Delete button to every row that deletes not only that row from the HTML table, but also from the $_SESSION variable.

This is the code that populates my table:

tableData.php

// echo the table headings
echo <<<HERE
<tr>
    <th>CityID</th>
    <th>State</th>
    <th>City</th>
    <th></th>
</tr>
HERE;

if (isset($_SESSION['cityData']))
{

    foreach($_SESSION['cityData'] as $city)
    {
        echo "<tr>";
        // print each row of data
        foreach($city as $data)
        {
            echo "<td>" . $data . "</td>";
        }
        //echo '<td><button action="<?php unset(' . $_SESSION['cityData'][key($_SESSION['cityData'])] . ')?>">Delete Row</button></td>';
        echo "</tr>";
    }

}

The line that I commented out, echo '<td><button action="<?php unset(' . $_SESSION['cityData'][key($_SESSION['cityData'])] . ')?>">Delete Row</button></td>'; is the line that creates the button that I am trying to create, to do what I am wanting it to do. I am trying to figure out the best way to name the array that I want gone.

P.S. I know, I should have it invoke some other function that does both tasks, it is just, if I pass the array in like I did, it will complain of " Array to string conversion ". Is there a way to do what I am trying to do, cleanly?

Answer 1

It's just not that simple. You need to get your buttons to submit to a link, and then have the PHP unset the content.

foreach($_SESSION['cityData'] as $index => $city) //added $index =>
{
    echo "<tr>";
    // print each row of data
    foreach($city as $data)
    {
        echo "<td>" . $data . "</td>";
    }
    echo '<td><form method="post" action=""><input type="hidden" name="delete" value="' . $index . '"><input type="submit" value="Delete Row"></form></td>';
    echo "</tr>";
}

So I added a form that a button that will submit to data that indicates the row number, so when your client clicks on the button, it will submit them and the row number will be passed as a POST variable.

At the top of tableData.php, you can then have logic handling the delete. Simply check if the delete is set, and then attempt to unset from there.

if (isset($_POST['delete']))
    unset($_SESSION['cityData'][$_POST['delete']]);

You will want to have further validation that checks if POST delete within the bounds of $_SESSION['cityData'], but the basic idea is there.