(PHP 5 >= 5.2.0, PHP 7)
openssl_csr_get_public_key — Returns the public key of a CSR
openssl_csr_get_public_key ( mixed $csr [, bool $use_shortnames = true ] ) : resource
openssl_csr_get_public_key() extracts the public key from csr and prepares it for use by other functions.
csr
See CSR parameters for a list of valid values.
use_shortnames
This parameter is ignored
Returns a positive key resource identifier on success, or FALSE on error.
Example #1 openssl_csr_get_public_key() example
<?php
$subject = array(
"commonName" => "example.com",
);
$private_key = openssl_pkey_new(array(
"private_key_bits" => 2048,
"private_key_type" => OPENSSL_KEYTYPE_RSA,
));
$csr = openssl_csr_new($subject, $private_key, array('digest_alg' => 'sha256') );
$public_key = openssl_csr_get_public_key($csr);
$info = openssl_pkey_get_details($public_key);
echo $info['key'];
?>
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https://www.php.net/manual/en/function.openssl-csr-get-public-key.php