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app/Helpers/Cleaner.php

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+<?php
+
+namespace App\Helpers;
+
+use ForceUTF8\Encoding as UTF8;
+
+/**
+ * Helper class to cleanup, format, sanitize strings.
+ */
+class Cleaner
+{
+    /**
+     * Ensures string doesn't contain any "undesirable" characters, such as
+     * extra-spaces or line-breaks. This is not a purifying method. Only basic
+     * cleanup is done here.
+     *
+     * @param string $string
+     * @param mixed  $stripTags
+     * @param mixed  $removeExtraSpaces
+     *
+     * @return string
+     */
+    public static function cleanupString($string, $stripTags = false, $removeExtraSpaces = false)
+    {
+        if (empty($string)) {
+            return null;
+        }
+
+        $string = trim($string);
+        $string = UTF8::toUTF8($string, UTF8::ICONV_TRANSLIT);
+        $string = html_entity_decode($string, ENT_QUOTES | ENT_HTML5, 'UTF-8');
+        $string = str_replace('&apos;', "'", $string);
+
+        if ($removeExtraSpaces) {
+            $string = preg_replace('/[[:space:]]+/', ' ', $string);
+        }
+
+        if ($stripTags) {
+            return strip_tags(trim($string));
+        }
+
+        return self::sanitize($string);
+    }
+
+    /**
+     * Perform some sanitizing actions on specified string.
+     *
+     * @param mixed $string
+     *
+     * @return string
+     */
+    public static function sanitize($string)
+    {
+        return $string;
+    }
+}

app/Helpers/Url.php

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+<?php
+
+namespace App\Helpers;
+
+use League\Uri\Http as UriHttp;
+use League\Uri\UriResolver;
+
+/**
+ * Helper to work with urls.
+ */
+class Url
+{
+    /**
+     * Convert specified relative URL to an absolute URL using specified base
+     * URL.
+     *
+     * @param mixed $baseUrl
+     * @param mixed $relativeUrl
+     *
+     * @return string
+     */
+    public static function makeUrlAbsolute($baseUrl, $relativeUrl)
+    {
+        if (\is_string($baseUrl)) {
+            $baseUrl = UriHttp::createFromString($baseUrl);
+        }
+
+        if (\is_string($relativeUrl)) {
+            $relativeUrl = UriHttp::createFromString($relativeUrl);
+        }
+
+        $newUri = UriResolver::resolve($relativeUrl, $baseUrl);
+
+        return (string) $newUri;
+    }
+}