How to add element to array without rewriting previous? - PHP

Question

I'm trying to add elements to an array after typing their name, but for some reason when I do

<?php
    session_start();
    $u = array("billy\n", "tyson\n", "sanders\n");
    serialize($u);
    file_put_contents('pass.txt', $u);

    if (isset($_POST['set'])) {
        unserialize($u);
        array_push($u, $_POST['check']);
        file_put_contents('pass.txt', $u);
    }
?>

<form action="index.php" method="post">
    <input type="text" name="check"/><br>
    <input type="submit" name="set" value="Add person"/><br>
    <?php echo print_r($u); ?>
</form>

It puts it in the array, but when I do it again, it rewrites the previous written element. Does someone know how to fix this?

I was referring to my entire script, it's about typing your name, and it being added to the array and so on, I just didn't want to show it all. — user3504199
– user3504199, Commented Apr 26, 2014 at 3:42
Then show an example where this issue can be reproduced. It works fine for me. — Amal
– Amal, Commented Apr 26, 2014 at 3:43
You can't keep arrays from different form submits, to do that you will need to use $_SESSION['person'][] = $u; — MISJHA
– MISJHA, Commented Apr 26, 2014 at 3:55

Timr · Accepted Answer · 2014-04-26 05:30:54Z

1

You always start with the same array, which means no matter what you do you're going to only be able to add one person. I /think/ you're trying to add each person to the file, which can be accomplished by modifying the code to resemble something like this:

session_start();

$contents = file_get_contents('pass.txt');    

if (isset($_POST['set'])) {
    $u = unserialize($contents);
    array_push($u, $_POST['check'] . "\n");
    $u = serialize($u);
    file_put_contents('pass.txt', $u);
}

Notice also that you can't use [un]serialize() on its own, it must be used in the setting of a variable.

**Note: Personally, I'd just go the easy route and do $u[] = $_POST['check'], as using array_push() to push one element seems a bit... overkill.

edited Apr 26, 2014 at 5:30

answered Apr 26, 2014 at 5:21

Timr

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1 Comment

user3504199 Over a year ago

But what if I wanted to add an element to the array aswell?

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