(PHP 4 >= 4.2.0, PHP 5, PHP 7)
openssl_x509_check_private_key — Checks if a private key corresponds to a certificate
openssl_x509_check_private_key ( mixed $cert , mixed $key ) : bool
Checks whether the given key is the private key that corresponds to cert.
The function does not check if key is indeed a private key or not. It merely compares the public materials (e.g. exponent and modulus of an RSA key) and/or key parameters (e.g. EC params of an EC key) of a key pair.
This means, for example, that a public key could be given for key and the function may return true.
cert
The certificate.
key
The private key.
Returns true if key is the private key that corresponds to cert, or false otherwise.
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https://www.php.net/manual/en/function.openssl-x509-check-private-key.php