$existing_hashes = array(
   'document1' => 
   '384:eGWhC3Uvw60bolB5EqQWXVyBp5ZXHqDj2Gub:mYUvywB620rZPh',
   'document2' => 
   '48:H46piMWRaKuCghtYCzHq2nzu50mAmyyGl7A/eIMTQySmmf2ysIX3zxPZ:H46I4tYCb9xmyyGlsMT9Smg2ysUZ'
);
$new_file_hash = ssdeep_fuzzy_hash_filename(__DIR__ . 'document2-version10.txt');
// 24:JBAMVT9eDWv9O/p6ktYCSQ5zdq2nLw4usVv2nZKoNAmyyGl7AETHCeIMT8ZySU:JiM6CghtYCzHq2nzu50mAmyyGl7A/eIy
foreach($existing_hashes as $key => $hash) {
   echo "$key: " . ssdeep_fuzzy_compare($new_file_hash, $hash) . "\n";
}
// document1: 0
// document2: 69