How to store string in an array? - PHP - php

Question

I'm trying to store a string in an array, but it doesn't save the array:
<?php
session_start();
$username = $_POST["username"];
$password = $_POST["password"];
$users = array();
$passes = array();
/*if (isset($_SESSION['users'])) {
$users = unserialize($_SESSION['users']);
}
if (isset($_SESSION['passes'])) {
$passes = unserialize($_SESSION['passes']);
}*/
if (isset($_POST['button'])) {
$login_successful = false;
for ($i = 0; $i < count($_SESSION['user']); $i++) {
if ($username === $_SESSION['user'][$i] && $password === $_SESSION['pass'][$i]) {
echo "<p style=\"font-family: Open Sans\">Logged in as " .$users[$i] ."</p>";
$login_successful = true;
break; // no need to continue the loop here, so we break out of it
}
}
if (!$login_successful) {
echo "<p style=\"font-family: Open Sans\">Login Failed</p>";
}
}
else if (isset($_POST['register'])) {
$users = array_push($users, $username);
$passes = array_push($passes, $password);
$_SESSION['user'] = serialize($users);
$_SESSION['pass'] = serialize($passes);
echo "Made your account successfully! Go back to login";
}
else if (isset($_POST['userlist'])) {
$users = unserialize($_SESSION['users']);
$passes = unserialize($_SESSION['passes']);
for ($i = 0; $i < count($users); $i++) {
echo $user[$i];
echo $passes[$i];
}
}
?>
It doesn't save the array, it changes it only for the current page it was called on and then the array goes back to nothing.
Thanks in advance

Answer 1

You seem to have a huge misunderstanding of how PHP works. Each time a php script runs, it's like the first very first time it has ever ran. So, your array will be removed from memory when the script finishes.
However, if you want to carry data between requests, you can try a session.
session_start();//important
//YOUR EXISTING ARRAY
$array = array("element", "element 2", "element 3");
//ADD YOUR NEW ELEMENT TO THE ARRAY
$array = array_push( $array, "NEW ELEMENT" );
//store the new serialized (converted to string) array
$_SESSION['my_array'] = serialize( $array );
if ( isset($_SESSION['my_array']) ) {
//grab the serialized (string version) of the array, and convert it back to an array
$my_array = unserialize( $_SESSION['my_array'] ); //holds [0] => "el1", [1] => "el2"
}
Read more about sessions from the PHP manual.
You can also try cookies or storing the array into a database. Just know that cookies are stored on the user's computer, and sessions are stored on the server.

Answer 2

you can use array_push like this : $user=array_push($user,$username);
That's all!

Answer 3

let's do some improvement on Ryan Smith's solution to make it simpler
session_start();
$_SESSION['users'][] = 'Hello';
var_dump($_SESSION['users']);
// if you wanna use $users,
/*
if(isset($_SESSION['users'])) {
$users = unserialize($_SESSION['users']);
}
*/