This fn allows you write to the WordPress debug log if you have it enabled in the wp_config file.

WordPress Debug Log | Write to Log

if (!function_exists('write_log')) {
    /**
     * Write to Debug Log with Optional Context
     *
     * Logs the provided variable to the PHP error log, always prefixed with the file and line number.
     * Optionally includes function, class, and call type context if $show_context is true.
     *
     * @param mixed $log The content to log (string, array, object, etc).
     * @param bool $show_context Whether to include function, class, and type context. Default false.
     * @return void
     */
    function write_log($log, $show_context = false)
    {
        // Get the backtrace to find the caller's context
        $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
        $caller = isset($backtrace[1]) ? $backtrace[1] : (isset($backtrace[0]) ? $backtrace[0] : []);

        $file = isset($caller['file']) ? $caller['file'] : 'unknown file';
        $line = isset($caller['line']) ? $caller['line'] : 'unknown line';

        // Always include file and line in the prefix
        $context = "[{$file}:{$line}] ";

        // Optionally add function, class, and type context
        if ($show_context) {
            $function = isset($caller['function']) ? $caller['function'] : 'global scope';
            $class = isset($caller['class']) ? $caller['class'] : '';
            $type = isset($caller['type']) ? $caller['type'] : '';
            if ($class) {
                $context .= "{$class}{$type}";
            }
            $context .= "{$function}() - ";
        }

        // Format the log message
        if (is_array($log) || is_object($log)) {
            $message = $context . print_r($log, true);
        } else {
            $message = $context . $log;
        }

        // Write to the error log
        error_log($message, 0);
    }
}

Changelog

1. Backtrace for File and Line: Used ‎debug_backtrace() to get the file and line number where ‎write_log() was called, so every log entry is prefixed with this info.
2. Prefix Construction: Built a prefix string in the format ‎[file:line] for clarity in the log.
3. Docblock Update: Updated the Docblock to reflect the new behaviour and clarify the parameter type.

Changelog

1. Added a ‎$show_context parameter (default ‎false): This allows you to toggle whether function, class, and type context is included in the log prefix.
2. Docblock updated:: It now describes the new parameter and its effect.
3. Conditional context logic: The function, class, and type are only added to the log prefix if ‎$show_context is ‎true.