PHP: openssl_error_string - Manual

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

openssl_error_string — Return openSSL error message

Description

function openssl_error_string(): string|false

Parameters

This function has no parameters.

Return Values

Returns an error message string, or false if there are no more error messages to return.

Examples

<?php
// lets assume you just called an openssl function that failed
while ($msg = openssl_error_string())
    echo $msg . "<br />\n";
?>

You need to do something like this to clear it:

while(openssl_error_string() !== false);

Some openssl functions will add errors to the list even if they succeed.