src/includes/classes/Core/Utils/Sri.php
public function checkMemcache(string $url, string $sha1)
    {
        if (!$this->memcache_enabled) {
            return $sri = null; // Not possible.
        } elseif (is_string($sri = $this->c::memcacheGet('sris', $sha1))) {
            return $sri; // Ideal; this avoids disk IO.
        }
        return $sri = null; // Not in the cache.
    }
public function checkMemcache(string $url, string $sha1)
    {
        if (!$this->memcache_enabled) {
            return $sri = null; // Not possible.
        } elseif (is_string($sri = $this->c::memcacheGet('sris', $sha1))) {
            return $sri; // Ideal; this avoids disk IO.
        }
        return $sri = null; // Not in the cache.
    }
Checks for SRI in memcache.

@since 170211.63148 SRI utils.

@param string $url  URL to get SRI for.
@param string $sha1 SHA-1 hash of URL.

@return string|null SRI hash, else `null`.