first

.gitignore

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+.idea
+vendor

composer.json

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+{
+    "name": "itguild/debug",
+    "description": "Debug library",
+    "type": "library",
+    "autoload": {
+        "psr-4": {
+            "Itguild\\Debug\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "Kavalar",
+            "email": "apuc06@mail.ru"
+        }
+    ],
+    "minimum-stability": "dev",
+    "require": {}
+}

src/Debug.php

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+<?php
+
+namespace Itguild\Debug;
+
+class Debug
+{
+    public static function prn($content)
+    {
+        echo '<pre style="background: lightgray; border: 1px solid black; padding: 2px">';
+        print_r($content);
+        echo '</pre>';
+    }
+    public static function dd($content)
+    {
+        echo '<pre style="background: lightgray; border: 1px solid black; padding: 2px">';
+        print_r($content);
+        echo '</pre>';
+        die();
+    }
+}