PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8
openssl_pkey_get_public - Extract public key from certificate and prepare it for use

openssl_pkey_get_public( OpenSSLAsymmetricKey|OpenSSLCertificate|array|string$public_key ): OpenSSLAsymmetricKey|false

openssl_pkey_get_public extracts the public key from public_key and prepares it for use by other functions.



public_key can be one of the following:

an OpenSSLAsymmetricKey instance

a string having the format file://path/to/file.pem. The named file must contain a PEM encoded certificate/public key (it may contain both).

A PEM formatted public key.

Return Values

Returns an OpenSSLAsymmetricKey instance on success, or false on error.


Version Description
8.0.0 On success, this function returns an OpenSSLAsymmetricKey instance now; previously, a resource of type OpenSSL key was returned.
8.0.0 public_key accepts an OpenSSLAsymmetricKey or OpenSSLCertificate instance now; previously, a resource of type OpenSSL key or OpenSSL X.509 was accepted.

Function openssl_pkey_get_public:

  • Manual

OpenSSL Functions

Most used PHP functions