openssl_error_string Return openSSL error message mixedopenssl_error_string &warn.experimental.func; Returns an error message string, or &false; if there are no more error messages to return. openssl_error_string returns the last error from the openSSL library. Error messages are stacked, so this function should be called multiple times to collect all of the information. The parameters/return type of this function may change before it appears in a release version of PHP \n"; ]]> This function was added in 4.0.6.