openssl_csr_new

Supported Versions: PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8
Generates a CSR
openssl_csr_new(    array $distinguished_names,    OpenSSLAsymmetricKey &$private_key,    ?array $options = null,    ?array $extra_attributes = null): OpenSSLCertificateSigningRequest|false
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$privkey = openssl_pkey_new();

$cert = openssl_csr_new($dn, $privkey);

$cert = openssl_csr_sign($cert, null, $privkey, 3650);
examples/99-generate-self-signed.php