ttrss/include/errorhandler.php

<?php
/**
 * @param array<int, array<string, mixed>> $trace
 */
function format_backtrace($trace): string {
	$rv = "";
	$idx = 1;

	if (is_array($trace)) {
		foreach ($trace as $e) {
			if (isset($e["file"]) && isset($e["line"])) {
				$fmt_args = [];

				if (is_array($e["args"] ?? false)) {
					foreach ($e["args"] as $a) {
						if (is_object($a)) {
							array_push($fmt_args, "{" . get_class($a) . "}");
						} else if (is_array($a)) {
							array_push($fmt_args, "[" . truncate_string(json_encode($a), 256, "...")) . "]";
						} else if (is_resource($a)) {
							array_push($fmt_args, truncate_string(get_resource_type($a), 256, "..."));
						} else if (is_string($a)) {
							array_push($fmt_args, truncate_string($a, 256, "..."));
						}
					}
				}

				$filename = str_replace(dirname(__DIR__) . "/", "", $e["file"]);

				$rv .= sprintf("%d. %s(%s): %s(%s)\n",
					$idx,
					$filename,
					$e["line"],
					$e["function"],
					implode(", ", $fmt_args));

				$idx++;
			}
		}
	}

	return $rv;
}

function ttrss_error_handler(int $errno, string $errstr, string $file, int $line): bool {
        // return true in order to avoid default error handling by PHP
	if (version_compare(PHP_VERSION, '8.0.0', '<')) {
		if (error_reporting() == 0 || !$errno) return true;
	} else {
		if (!(error_reporting() & $errno)) return true;
	}

	$file = substr(str_replace(dirname(__DIR__), "", $file), 1);

	$context = format_backtrace(debug_backtrace());
	$errstr = truncate_middle($errstr, 16384, " (...) ");

	if (class_exists("Logger"))
		return Logger::log_error((int)$errno, $errstr, $file, (int)$line, $context);
	else
		return false;
}

function ttrss_fatal_handler(): bool {
	$error = error_get_last();

	if ($error !== NULL) {
		$errno = $error["type"];
		$file = $error["file"];
		$line = $error["line"];
		$errstr  = $error["message"];

		if (!$errno) return false;

		$context = format_backtrace(debug_backtrace());

		$file = substr(str_replace(dirname(__DIR__), "", $file), 1);

		if (class_exists("Logger"))
			return Logger::log_error((int)$errno, $errstr, $file, (int)$line, $context);
	}

	return false;
}

register_shutdown_function('ttrss_fatal_handler');
set_error_handler('ttrss_error_handler');