hash_init

Function • Misc changes in PHP 8.2

Initialize an incremental hashing context.

PHP 5

PHP 7

Improved

Improved

Changed

PHP 8.3

PHP 8.4

PHP 8.5

PHP 8.6

hash_init(
    string $algo,
    int $flags = 0,
    string $key = "",
    array $options = []
  ): HashContext

Typestring

Name of selected hashing algorithm (e.g. "sha256"). For a list of supported algorithms see hash_algos.

OptionalTypeintDefault value0

Optional settings for hash generation, currently supports only one option: HASH_HMAC. When specified, the $key must be specified.

OptionalTypestringDefault value""

When HASH_HMAC is specified for $flags, a shared secret key to be used with the HMAC hashing method must be supplied in this parameter.

OptionalTypearrayDefault value[]

An array of options for the various hashing algorithms. Currently, only the "seed" parameter is supported by the MurmurHash variants.

TypeHashContext

Changes to the `hash_init` Function

 hash_init(
     string $algo,
     int $flags = 0,
-    string $key = ""
+    string $key = "",
+    array $options = []
   ): HashContext

  hash_init(
-     $algo,
+     string $algo,
-     $options,
+     int $flags = 0,
-     $key
+     string $key = ""
-   )
+   ): HashContext