[PHP-NOTES] note 130469 added to function.openssl-sign

Note: to use openssl_sign with ed25519 key in PHP 8.4 (and probably later versions), you need to explicitly pass 0 as algorithm identifier. Omitting this parameter will not work (because this parameter defaults to SHA1), but for some reason there is currently no OPENSSL_ALGO_xxxxx constant for the default signature algorithm.
<?php
  $pkey = openssl_pkey_new(['private_key_type' => OPENSSL_KEYTYPE_ED25519]);
  if (openssl_sign('text', $sig, $pkey, 0)) {
    echo 'Signature successful: ' . bin2hex($sig);
  } else {
    echo 'Signature failed!';
  }
?>
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Manual Page -- https://php.net/manual/en/function.openssl-sign.php
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