Restart the PHP array indexes [duplicate] - php

Question

This question already has answers here:
How to find the first free key in an array
(7 answers)
Find the first missing number in a sequence of numbers
(5 answers)
Closed 3 years ago.
I will explain:
I have a socket socket.php file that will add a connection for each user so the user has multiple connections from different devices.
$clients[] = $socketChange; // array_push($clients,$socketChange); // 505
$end = key (array_slice ($clients, -1, 1, TRUE)); // extract 505
$userConexion [$userId] [] = $end; // add to clientID socket 505
what you do is add each connection to the client array and then the last added socket assign it to the corresponding user. so the user can have multiple sessions of different devices and in all will receive the information in real time.
Now what is my question is ...
how can I control of positions, that is, if they connect and disconnect 1k from users
for the user number 1001 $ clients he will show me$ clients [1001]how he could restart the counter without removing the users already connected.
i delete clients socket close with unset() array_shift() reorder bad $clients sockets.
example:
$clients[0] = resource 0;
$clients[1,433] = empty;
$clients[434] = resource 434;
$clients[435] = resource 435;
$clients[436,450] = empty;
$clients[451] = resource 435;
$clients[452,999] = empty;
$clients[1000] = resource 1000;
new connexion 1001
add to empty positions.
example:
<?php
$a1 = array();
$a2 = array();
for ($i=1; $i < 4 ; $i++) {
$a1[] = array("hello{$i}" => "hello{$i}");
$a2[] = array("hello{$i}" => "hello{$i}");
}
echo "<pre>";
unset($a1[1]);
unset($a2[1]);
$a1[] = array("hello11" => "hello11");
array_push($a2, array("hello11" => "hello11"));
print_r($a1); // 0,2,3
print_r($a2); // 0,2,3
// need insert in position empty in this example `1`.

Answer 1

I'm not sure to understand your question, but if you want to add the new connection's data in the first unoccupied index of your array, here is something you can do :
for($i=0; $i<count($clients)+1; $i++) {
if(!isset($clients[$i]) {
$clients[$i] = resource 1001;
break;
}
}
Use empty($clients[$i]) instead of !isset($clients[$i]) if the index still exist in the array and simply do not have a value anymore.