openssl_verify() is populating openssl_error_string() even on false.
When openssl_verify() returns 0, openssl_error_string() is populated with 1.
I spent lot of time to understand, while my next call to openssl was failing with checks for error.
<?php
$c = file_get_contents($filename);
$publicKey = openssl_pkey_get_public($c);
$result = openssl_verify('freedom', 'someirrelevantnosign', $publicKey);
$error = "";
while ($msg = openssl_error_string() !== false) {
$error .= $msg;
}
if (!empty($error)) {
echo $error; }
