## Installation

There is no installation needed to use these functions; they are part of the PHP core.

However, to enable Argon2 password hashing, PHP must be built either with libargon2 support using the --with-password-argon2 configure option or, starting from PHP 8.4.0, with OpenSSL using --with-openssl and --with-openssl-argon2.

Prior to PHP 8.1.0, it was possible to specify the argon2 directory with --with-password-argon2[=DIR].

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