PHP class to find value in array from session - php

Question

I am trying to make a simple class that I can use to check if a value exists within an array. There is a session that contains multiple tool values. I am trying to pass the toolID to this function as well as a key and see if that value exists.
Session Data:
Array
(
[keyring] => Array
(
[tool] => Array
(
[toolID] => 1859
[keys] => Array
(
[0] => 49
[1] => 96
)
)
)
)
class Keyring
{
public function checkKey($key, $toolID){
$keyring = $_SESSION['keyring'];
if(isset($keyring)){
foreach($keyring['tool'] as $k => $v) {
if($k == 'toolID' && $v == $toolID){
if (in_array($key, $k->keys)){
return true;
}
}
}
}
return false;
}
}
$keyring = new Keyring();
print_r($keyring->checkKey(49, 1859));
In this example, I am trying to see if key 49 exists in the session for tool 1859.
I am getting the following error : Warning: in_array() expects parameter 2 to be array, null given in.
Is there a better approach for this? All I am looking for is a true/false as to whether that key exists in the keys array for the specified tool.

Answer 1

For my code to work for you may need to change your array a bit or change the code a bit, but rather then looping through a bunch of keys trying to find the right one we are just looking for the keys in the array if they are not set, then return false, or if we find keyring - tools - $tool_id - key_{$key_id} we are just going to return that value, if key_49 = false the function returns false. This should be a tad bit quicker to run on the server for you.
function has_keyring($tool_id, $key_id)
{
//Just to keep the code tidy let's store the tools key in $tool variable
$tool = $_SESSION['keyring']['tools'];
if(isset($tool[$tool_id]) && isset($tool[$tool_id]["key_{$key_id}"]))
return $tool[$tool_id]["key_{$key_id}"];
return false;
}