Password Hashing Functions
PHP Manual

password_needs_rehash

Checks if the given hash matches the given options

Description

boolean password_needs_rehash ( string $hash , string $algo [, string $options ] )

This function checks to see if the supplied hash implements the algorithm and options provided. If not, it is assumed that the hash needs to be rehashed.

Parameters

hash

A hash created by password_hash.

algo

A password algorithm constant denoting the algorithm to use when hashing the password.

options

An associative array containing options. See the password algorithm constants for documentation on the supported options for each algorithm.

Return Values

Returns TRUE if the hash should be rehashed to match the given algo and options, or FALSE otherwise.