Hashing Tables Helper Generator
Fast, accurate and free online hashing tables helper generator tool running directly in your browser.
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1Enter data
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2Click the button
The tool will immediately process your data in the browser. -
3Get the result
Copy the finished text or save the file to your device.
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Other tools you may find usefulPHP array hash generator – fingerprint data structure
Comparing or caching complex PHP arrays requires creating deterministic keys. The tool generates a hash from a PHP array (serialize + hash) or JSON, which allows you to quickly compare structures without full iteration.
PHP array hashing methods
serialize() + hash(): serialize($arr) gives a deterministic string representation of an array. md5(serialize($arr)): fast hash, 32 hex. sha1(serialize($arr)): 40 hex. hash("sha256", serialize($arr)): 64 hex. json_encode() + hash(): alternative serialization (does not support resources/objects).
serialize() vs json_encode()
serialize(): native PHP, supports objects (classes), resources (partially), strict types. json_encode(): JSON-compatible, portable (other languages), slower for nested structures. For simple associative arrays: json_encode() is comparable. For objects with methods: serialize() the only option.
Key ordering and determinism
Problem: ["b"=>2,"a"=>1] vs ["a"=>1,"b"=>2] have different serialize() but logically identical. Solution: ksort() recursive before serialization. Function array_hash_sorted: function array_hash($a){ksort($a);foreach($a as &$v)if(is_array($v))$v=array_hash($v);return md5(serialize($a));}.
Application uses
Cache key from query parameters: $key="sql:".array_hash($params). Configuration change detection: compare the hash of the config file with the previous one. HTTP etag: hash of the data array = value of the ETag (cache validation) header. Duplicates: compare hashes instead of deep-equal.
FAQ
Is MD5 safe for hashing arrays?
For cache and data comparison purposes – yes. MD5 is sufficient when cryptographic security is not a concern. For passwords: NEVER – use password_hash() with bcrypt/argon2. MD5 is easy to reverse for known data (rainbow tables).
How to compare two PHP arrays without key order?
Simple equality: $a == $b (PHP checks values, not key order for associative). Deep equality: ksort + serialize recursive function. Library: symfony/property-access or twig/twig. PHP 8.1+: array_is_list() for (numeric) lists.
How to generate HTTP ETag from data?
$data = fetchFromDB(); $etag = array_hash($data). header("ETag: \"$etag\""); if ($_SERVER["HTTP_IF_NONE_MATCH"] === $etag) { http_response_code(304); exit; }. ETag allows browsers to cache resources and check if they have changed without downloading the whole thing.
What is a cache key and how to construct it?
Cache key: a unique identifier for a cacheable value. Constructing: "prefix:version:hash_params". Example: "user:v2:".md5(serialize($queryParams)). Redis: SET $key $value EX 3600. Memcached: $mc->set($key, $value, 3600). The tool generates a hash ready to be used as a key.
Is serialize() safe for deserialization?
unserialize() from untrusted data = critical security vulnerability (PHP object injection, RCE). Never deserialize data from a user! For safe serialization: json_encode/json_decode (only data, not PHP objects). PHP 7+: unserialize($data, ["allowed_classes" => false]) limits types.
Related tools: test JSON API generator, JSON validator and payload API formatter.