DependencyWrapper.php

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<?php
class DependencyWrapper {
    private $value;
    private $deps;
 
    function __construct( $value = false, $deps = [] ) {
        $this->value = $value;
 
        if ( !is_array( $deps ) ) {
            $deps = [ $deps ];
        }
 
        $this->deps = $deps;
    }
 
    function isExpired() {
        foreach ( $this->deps as $dep ) {
            if ( $dep->isExpired() ) {
                return true;
            }
        }
 
        return false;
    }
 
    function initialiseDeps() {
        foreach ( $this->deps as $dep ) {
            $dep->loadDependencyValues();
        }
    }
 
    function getValue() {
        return $this->value;
    }
 
    function storeToCache( $cache, $key, $expiry = 0 ) {
        $this->initialiseDeps();
        $cache->set( $key, $this, $expiry );
    }
 
    static function getValueFromCache( $cache, $key, $expiry = 0, $callback = false,
        $callbackParams = [], $deps = []
    ) {
        $obj = $cache->get( $key );
 
        if ( is_object( $obj ) && $obj instanceof DependencyWrapper && !$obj->isExpired() ) {
            $value = $obj->value;
        } elseif ( $callback ) {
            $value = $callback( ...$callbackParams );
            # Cache the newly-generated value
            $wrapper = new DependencyWrapper( $value, $deps );
            $wrapper->storeToCache( $cache, $key, $expiry );
        } else {
            $value = null;
        }
 
        return $value;
    }
}