feat: logging module

src/Logger.php

@@ -0,0 +1,48 @@
+<?php
+
+logging::$logLevel = logging::DEBUG;
+
+$logColor = array(
+    logging::DEBUG    => '37m', // white
+    logging::INFO     => '36m', // light blue
+    logging::WARNING  => '33m', // yellow
+    logging::ERROR    => '31m', // red
+    logging::CRITICAL => '35m', // purple
+);
+
+class logging {
+    public const DEBUG = 0;
+    public const INFO = 1;
+    public const WARNING = 2;
+    public const ERROR = 3;
+    public const CRITICAL = 4;
+    public static int $logLevel;
+
+    public static function debug($message): void {
+        logging::output($message, logging::DEBUG); // debug level
+    }
+
+    public static function info($message): void {
+        logging::output($message, logging::INFO); // info level
+    }
+
+    public static function warning($message): void {
+        logging::output($message, logging::WARNING); // warning level
+    }
+
+    public static function error($message): void {
+        logging::output($message, logging::ERROR); // error level
+    }
+
+    public static function critical($message): void {
+        logging::output($message, logging::CRITICAL); // critical level
+    }
+
+    private static function output($message, $type): void {
+        global $logColor;
+        if ($type < logging::$logLevel) {
+            return; // skip output
+        }
+        echo "\033[" . $logColor[$type] . $message . "\033[0m" . PHP_EOL;
+    }
+}

src/demo.php

@@ -0,0 +1,9 @@
+<?php
+
+require_once 'Logger.php';
+
+logging::debug('debug');
+logging::info('info');
+logging::warning('warning');
+logging::error('error');
+logging::critical('critical');