EntityCapabilitiesService.php

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<?php
 
namespace Elgg;
 
class EntityCapabilitiesService {
    
    protected $entities = [];
    
    public function hasCapability(string $type, string $subtype, string $capability, bool $default = false): bool {
        return elgg_extract($capability, elgg_extract($subtype, elgg_extract($type, $this->entities, []), [])) ?? $default;
    }
    
    public function setCapability(string $type, string $subtype, string $capability, bool $value): void {
        if (!isset($this->entities[$type])) {
            $this->entities[$type] = [];
        }
 
        if (!isset($this->entities[$type][$subtype])) {
            $this->entities[$type][$subtype] = [];
        }
        
        $this->entities[$type][$subtype][$capability] = $value;
    }
    
    public function getTypesWithCapability(string $capability): array {
        $result = [];
        
        foreach ($this->entities as $type => $subtypes) {
            foreach ($subtypes as $subtype => $capabilities) {
                if (elgg_extract($capability, $capabilities) !== true) {
                    continue;
                }
                
                if (!isset($result[$type])) {
                    $result[$type] = [];
                }
                
                $result[$type][] = $subtype;
            }
        }
        
        return $result;
    }
}