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app/Models/Traits/HasUrl.php

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+<?php
+
+namespace App\Models\Traits;
+
+trait HasUrl
+{
+    /**
+     * Return url in its idn form. Adds HTML markup to "syntax highlight" url
+     * elements.
+     *
+     * @return string
+     */
+    public function getAsciiUrlAttribute()
+    {
+        if (empty($this->attributes['url'])) {
+            return null;
+        }
+
+        mb_internal_encoding('UTF-8');
+
+        $url = \urldecode($this->attributes['url']);
+        
+        $host     = \parse_url($url, PHP_URL_HOST);
+        $ascii    = \idn_to_ascii($host);
+        $idnUrl   = str_replace($host, $ascii, $url);
+        $finalUrl = '';
+
+        foreach (preg_split('//u', $idnUrl, null, PREG_SPLIT_NO_EMPTY) as $char) {
+            if (mb_strlen($char) != strlen($char)) {
+                $class = 'suspicious';
+            } elseif (preg_match('#[A-Z]#', $char)) {
+                $class = 'capital';
+            } elseif (preg_match('#[a-z]#', $char)) {
+                $class = 'letter';
+            } elseif (preg_match('#[0-9]#', $char)) {
+                $class = 'number';
+            } elseif (preg_match('#([:/.?$\#_=])#', $char)) {
+                $class = 'operator';
+            } elseif (empty($char)) {
+                $class = 'empty';
+            } else {
+                $class = 'other';
+            }
+
+            $finalUrl .= sprintf('<span class="%s">%s</span>', $class, $char);
+        }
+
+        return $finalUrl;
+    }
+}