python style exception trace for PHP

python_like_exception.php

    static function python_like_exception(
		Throwable $e, bool $skip_seen = true, ?array $seen = null
	): string {
		if ($skip_seen && !$seen) {
			$seen = array();
		}
		$prev  = $e->getPrevious();
		if ($prev) {
			$result[] = self::python_like_exception($prev, $skip_seen, $seen);
			$result[] = "\nDuring handling of the above exception, another exception occurred:\n";
		}
		$trace = $e->getTrace();
		// add the current line as well
		$trace = array_merge([["file" => $e->getFile(), "line" => $e->getLine(), "function" => null, "args" => null]], $trace);
		$str = self::python_like_trace($trace, $skip_seen, $seen, "# Exception thrown");
		$str.= sprintf('%s: %s', get_class($e), $e->getMessage());
		return $str;
	}

	static function python_like_trace(
		array $trace, bool $skip_seen = false, ?array $seen = null, string $end_message='# You are here.'
	): string {
		if ($skip_seen && !$seen) {
			$seen = array();
		}
		$result = array();
		$trace = array_reverse($trace);
		$trace_count = count($trace);
		$result[] = "Traceback (most recent call last):";
		$last_stack = null;
		$current = null;
		while ($trace_count > 0) {
			$stack = $trace[0];

			$last_current = $current;
			$current = serialize($stack);
			if ($skip_seen && is_array($seen) && in_array($current, $seen) && in_array($last_current, $seen)) {
				$duplications = 1;
				while ($trace_count > 1) {
					$last_stack = $stack;
					$stack = $trace[0];
					$current = serialize($stack);
					if (!in_array($current, $seen)) {
						$result[] = sprintf('  ... %d more ...', $duplications + 1);
						break;
					}
					$duplications++;
					array_shift($trace);
					$trace_count--;
				}
				echo "";
			}

			//File "/Users/me/Desktop/exception_test.py", line 8, in foo
			if ($last_stack) {
				$func_name = sprintf('%s%s%s',
					$trace_count && array_key_exists('class', $last_stack) ? str_replace('\\', '.', $last_stack['class']) : '',
					$trace_count && array_key_exists('class', $last_stack) && array_key_exists('function', $last_stack) ? '.' : '',  // dot only if function and class.
					$trace_count && array_key_exists('function', $last_stack) && $last_stack['function'] ? str_replace('\\', '.', $last_stack['function']) : '{???}'
				);
			} else {
				$func_name = '{main}';
			}
			$last_stack = $stack;
			$result[] = sprintf('  File %s%s in %s',
				array_key_exists('file', $stack) ? '"'.$stack['file'].'"' : 'Unknown Source',
				array_key_exists('file', $stack) && array_key_exists('line', $stack) && $stack['line'] ? sprintf(', line %s', $stack['line']) : '',
				$func_name
			);
			if ($trace_count > 1) {
				$result[] = sprintf("    %s%s%s(%s)",
					$trace_count && array_key_exists('class', $stack) ? str_replace('\\', '.', $stack['class']) : '',
					$trace_count && array_key_exists('class', $stack) && array_key_exists('function', $stack) ? (array_key_exists('type', $stack) ? $stack['type'] : '.') : '',  // dot only if function and class.
					$trace_count && array_key_exists('function', $stack) && $stack['function'] ? str_replace('\\', '.', $stack['function']) : '{main}',
					$trace_count && array_key_exists('function', $stack) && $stack['args'] !== null ? implode(", ", array_map(function ($arg) use ($stack) {return implode('', array_map(function ($line) use ($stack) { return trim($line); }, explode("\n", @var_export($arg, true))));}, $stack['args'])) : '…'
				);
			} else {
				$result[] = sprintf("    %s", $end_message);
			}

			if ($skip_seen && is_array($seen)) {
				$seen[] = $current;
			}
			if (!$trace_count) {
				break;
			}
			array_shift($trace);
			$trace_count--;
		}
		$result = join("\n", $result);
		return $result;
	}