php 解读异常信息

<?php
class CustomException extends Exception {
    public function __construct($message, $code = 0, Throwable $previous = null) {
        parent::__construct($message, $code, $previous);
    }
}

function divide($numerator, $denominator) {
    if ($denominator == 0) {
        throw new CustomException("Denominator cannot be zero.");
    }
    return $numerator / $denominator;
}

try {
    echo divide(10, 0);
} catch (CustomException $e) {
    echo "Caught exception: " . $e->getMessage();
} catch (Exception $e) {
    echo "Caught general exception: " . $e->getMessage();
}
?>

Fatal error: Uncaught CustomException: Denominator cannot be zero. in /path/to/file.php:10
Stack trace:
#0 /path/to/file.php(15): divide(10, 0)
#1 {main}
  thrown in /path/to/file.php on line 10