Check that the signed message has a valid signature

# sodium_crypto_sign_open

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_sign_open — Check that the signed message has a valid signature

### Description

sodium_crypto_sign_open(string `$signed_message`, string `$public_key`): string|false

Verify the signature attached to a message and return the message

### Parameters

`signed_message`
  A message signed with sodium_crypto_sign()
`public_key`
  An Ed25519 public key

### Return Values

Returns the original signed message on success, or `false` on failure.

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