An importable script to hold sensitive information not to be committed in other files. Provides string value lookup with keys, or categorised sub-keys.

keystore.php

<?php
/*
The keystore is a map from keys to values, but nested arrays allow sub-key organisation.
This means an array cannot be retrieved as a value, only its (scalar) contents.
*/
$keystore = array(
    "key" => "valueA",
    "group" => array(
        "subkey1" => 42,
        "subkey2" => true
    )
);
/*
Call with a list of keys to traverse, and returns the value.
e.g. keystore("key") => "valueA"
     keystore("group", "subkey1") => 42
     keystore("group", "subkey2") => true
     keystore("group") => false
*/
function keystore() {
    global $keystore;
    $out = $keystore;
    foreach (func_get_args() as $arg) {
        if (!array_key_exists($arg, $out)) {
            return false;
        }
        $out = $out[$arg];
    }
    return is_scalar($out) ? $out : false;
}