(PHP 5 >= 5.3.4, PHP 7)
pcntl_strerror — Retrieve the system error message associated with the given errno
pcntl_strerror ( int $errno ) : string|false
This function is currently not documented; only its argument list is available.
errno
Returns error description on success or false on failure.
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https://www.php.net/manual/en/function.pcntl-strerror.php