php - Add user input to array

Question

I am trying to add user input to a previously created array with array_merge. However, I am having trouble echoing the entire, new array as an unordered list. the user's entry is being processed correctly, but the original array is displaying as "Array" within the unordered list. Here is the code:

<?php
$travel = array("Automobile", "Jet", "Ferry", "Subway");

foreach ($travel as $t)
    {
    echo "<ul>";

    echo "<li>$t</li>";

    echo "</ul>";

    }
?>

<form action="arrays.php" method="post">
<input type="text" name="added" />
<?php

foreach ($travel as $t)
{
echo "<input type=\"text\" name=\"travel[]\" value=\"$t\" />";      
}

?>
<input type="submit" name="submit" value="Add More!" />
</form>

<?php

$travel = array($_POST["travel"]);

$added = explode(",", $_POST["added"]);

$travel = array_merge($travel, $added);

echo "<p> Here is the list with your additions:</p>";

echo "<ul>";

foreach ($travel as $t)
{
echo "<li>$t</li>";
}

echo "</ul>";
?>

Answer 1

问题就这样解决了：

if (isset($_POST["submit"]))
{
$travel = $_POST["travel"];
$added = explode(",", $_POST["added"]);
$travel = array_merge($travel, $added);


echo "<p> Here is the list with your additions:</p>";

echo "<ul>";

foreach ($travel as $t)
    {
    echo "<li>$t</li>";
    }

echo "</ul>";
}
?>

Answer 2

尝试为 array_merge() 创建的新数组使用新的变量名。我认为您可能会在修改要存储的数组时遇到问题。

Answer 3

$travel = array($_POST["travel"]);

应该

$travel = $_POST['travel'];