Debug helper

backtrace_printer.php

<?php
declare(ticks=100);
register_tick_function('do_profile');
function do_profile() {
	$bt = debug_backtrace();
	if (count($bt) <= 1) {
		return;
	}
	$frame = $bt[1];
	unset($bt);
	$type = $frame['type'];
	$function = $frame['function'];
	$class = $frame['class'];
	$func = function ($a) {
		if (is_array($a)) {
			$count = count($a);
			return "array(...) [$count]";
		} elseif (is_string($a)) {
			if (mb_strlen($a) > 30) {
				$a = mb_substr($a, 0, 30) . '...';
			}
			return var_export($a, 1);
		} else {
			return var_export($a, 1);
		}
	};
	$args = '(' . implode(', ', array_map($func, $frame['args'])) . ')';
	error_log($class . $type . $function . $args . PHP_EOL);
}