PHP 8 reference · String Functions

PHP hash() Function

Hash a string with the algorithm you choose, such as sha256, sha512, crc32b or xxh3. Returns a hex string.

PHP 8 Since 5.1

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Syntax

hash(string $algo, string $data, bool $binary = false, array $options = []): string

Parameters

Parameter	Description
`algo`	The algorithm name; `hash_algos()` lists them all.
`data`	The data to hash.
`binary` optional	`true` returns raw bytes. Default: `false`
`options` optional	Algorithm options, such as a `seed` for xxHash and MurmurHash. Default: `[]`

Return value

The hash as a lowercase hex string.

Examples

Different algorithmsTry it yourself

<?php
echo hash("sha256", "hello"), "\n";
echo hash("crc32b", "hello"), "\n";

Output

2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824
3610a686

Sign data with an HMACTry it yourself

<?php
$secret = "server-side-key";
$sig = hash_hmac("sha256", "order=42&total=19.50", $secret);
echo strlen($sig), "\n";
var_dump(hash_equals($sig, hash_hmac("sha256", "order=42&total=19.50", $secret)));