docker based

app/composer.json

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+{
+    "require": {
+        "clue/hexdump": "^0.2.0"
+    }
+}

app/composer.lock

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+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "7f407acae21f3deea948660dd0db9eed",
+    "packages": [
+        {
+            "name": "clue/hexdump",
+            "version": "v0.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/clue/php-hexdump.git",
+                "reference": "d2fdb529522f60fd0855cb424afaa77ad9b1493b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/clue/php-hexdump/zipball/d2fdb529522f60fd0855cb424afaa77ad9b1493b",
+                "reference": "d2fdb529522f60fd0855cb424afaa77ad9b1493b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "Clue\\Hexdump": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "View any (binary) string as a hexdump",
+            "homepage": "https://github.com/clue/hexdump",
+            "keywords": [
+                "binary",
+                "hexdump",
+                "network protocol debugging"
+            ],
+            "support": {
+                "issues": "https://github.com/clue/php-hexdump/issues",
+                "source": "https://github.com/clue/php-hexdump/tree/v0.2.0"
+            },
+            "time": "2013-06-22T21:28:05+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": [],
+    "plugin-api-version": "2.0.0"
+}

app/public/img/favicon.io/about.txt

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+This favicon was generated using the following font:
+
+- Font Title: Margarine
+- Font Author: Copyright (c) 2012 by Brian J. Bonislawsky DBA Astigmatic (AOETI) (astigma@astigmatic.com), with Reserved Font Name "Margarine"
+- Font Source: http://fonts.gstatic.com/s/margarine/v11/qkBXXvoE6trLT9Y7YLye5JRLkAXbMQ.ttf
+- Font License: SIL Open Font License, 1.1 (http://scripts.sil.org/OFL))

app/public/img/favicon.io/site.webmanifest

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+{
+    "name": "Dencode",
+    "short_name": "Dencode",
+    "description": "Encode and Decode strings from/to URL, Base64, HTML entities, UU, Qprint, hash, hex and more.",
+    "icons": [
+        {
+            "src": "/img/favicon.io/android-chrome-192x192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "/img/favicon.io/android-chrome-512x512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        }
+    ],
+    "theme_color": "#ffffff",
+    "background_color": "#ffffff",
+    "display": "standalone"
+}

app/public/index.php

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+<?php
+
+declare(strict_types=1);
+
+require_once '../vendor/autoload.php';
+
+// action => label
+$buttons = [
+    'urlencode' => 'URL Encode',
+    'urldecode' => 'URL Decode',
+    'b64encode' => 'Base64 Encode',
+    'b64decode' => 'Base64 Decode',
+    'htmlencode' => 'HTML Encode',
+    'htmldecode' => 'HTML Decode',
+    'uuencode' => 'UU Encode',
+    'uudecode' => 'UU Decode',
+    'qprintencode' => 'Qprint Encode',
+    'qprintdecode' => 'Qprint Decode',
+    'hash' => 'Hash',
+    'hex' => 'Hex',
+    'prettyjson' => 'Pretty JSON',
+];
+
+$str = $result = $_GET['str'] ?? '';
+$action = $_GET['action'] ?? '';
+$help = 'https://www.php.net/manual/en/index.php';
+
+if ($action == 'reset') {
+    http_response_code(302);
+    header("Location: /");
+    die();
+
+} elseif ($action == 'urlencode') {
+    $result = rawurlencode($str)?: $str;
+    $help = 'https://www.php.net/rawurlencode';
+
+} elseif ($action == 'urldecode') {
+    $result = rawurldecode($str)?: $str;
+    $help = 'https://www.php.net/rawurldecode';
+
+} elseif ($action == 'b64encode') {
+    $result = base64_encode($str)?: $str;
+    $help = 'https://www.php.net/base64_encode';
+
+} elseif ($action == 'b64decode') {
+    $result = base64_decode($str)?: $str;
+    $help = 'https://www.php.net/base64_decode';
+
+} elseif ($action == 'htmlencode') {
+    $result = htmlentities($str, ENT_QUOTES | ENT_HTML5)?: $str;
+    $help = 'https://www.php.net/htmlentities';
+
+} elseif ($action == 'htmldecode') {
+    $result = html_entity_decode($str, ENT_QUOTES | ENT_HTML5)?: $str;
+    $help = 'https://www.php.net/html_entity_decode';
+
+} elseif ($action == 'uuencode') {
+    $result = convert_uuencode($str)?: $str;
+    $help = 'https://www.php.net/convert_uuencode';
+
+} elseif ($action == 'uudecode') {
+    $result = convert_uudecode($str)?: $str;
+    $help = 'https://www.php.net/convert_uudecode';
+
+} elseif ($action == 'hash') {
+    $result = "Algorithm        Time  Len  Hash\n";
+    foreach (hash_algos() as $algo) {
+        $t1 = microtime(true);
+        $r = hash($algo, $str, false);
+        $t2 = (microtime(true) - $t1) * 1000;
+        $result .= sprintf("%-15s %.3f  %3d  %s\n", $algo, $t2, strlen($r), $r);
+    }
+
+    // password_hash(PASSWORD_DEFAULT)
+    $t1 = microtime(true);
+    $r = password_hash($str, PASSWORD_DEFAULT);
+    $t2 = (microtime(true) - $t1);
+    $result .= sprintf("%-15s %.3f  %3d  %s\n", 'password_hash', $t2, strlen($r), $r);
+
+    $result = trim($result);
+    $help = 'https://www.php.net/hash';
+
+} elseif ($action == 'hex') {
+    $dumper = new Clue\Hexdump\Hexdump();
+    $result = $dumper->dump($str);
+    $help = 'https://github.com/clue/php-hexdump';
+
+} elseif ($action == 'qprintencode') {
+    $result = quoted_printable_encode($str)?: $str;
+    $help = 'https://www.php.net/quoted_printable_encode';
+
+} elseif ($action == 'qprintdecode') {
+    $result = quoted_printable_decode($str)?: $str;
+    $help = 'https://www.php.net/quoted_printable_decode';
+
+} elseif ($action == 'prettyjson') {
+    $jd = json_decode($str);
+    if (JSON_ERROR_NONE !== json_last_error()) {
+        $result = 'Error: '. json_last_error_msg() ."\n\n". $str;
+    } else {
+        $result = json_encode($jd, JSON_PRETTY_PRINT | JSON_PRESERVE_ZERO_FRACTION | JSON_UNESCAPED_SLASHES);
+    }
+    $help = 'https://www.php.net/json';
+
+}
+
+?><!doctype html>
+<html lang="en">
+    <head>
+        <script async src="https://www.googletagmanager.com/gtag/js?id=UA-70198-12"></script>
+        <script>
+            window.dataLayer = window.dataLayer || [];
+            function gtag() { dataLayer.push(arguments) }
+            gtag('js', new Date());
+            gtag('config', 'UA-70198-12');
+        </script>
+
+        <meta charset="utf-8">
+        <meta name="description" content="Encode and Decode strings from/to URL, Base64, HTML entities, UU, Qprint, hash, hex and more." />
+
+        <title>Encode/Decode everything</title>
+        <meta name="description" content="Encode/Decode everything, base64, url, html, charset">
+        <meta name="author" content="Sergio Álvarez <correo@sergio.am>">
+
+        <link rel="apple-touch-icon" sizes="180x180" href="/img/favicon.io/apple-touch-icon.png">
+        <link rel="icon" type="image/png" sizes="32x32" href="/img/favicon.io/favicon-32x32.png">
+        <link rel="icon" type="image/png" sizes="16x16" href="/img/favicon.io/favicon-16x16.png">
+        <link rel="manifest" href="/img/favicon.io/site.webmanifest">
+
+        <!-- <link rel="stylesheet" href="https://unpkg.com/normalize.css@8.0.1/normalize.css"> -->
+        <link rel="stylesheet" href="https://unpkg.com/spectre.css@0.5.8/dist/spectre.min.css">
+        <style type="text/css">
+            html, body { height: 100%; } 
+            body { margin: 0; } 
+            textarea.form-input { width: 100%; height: 80vh; font-family: monospace; } 
+            .container { padding-top: .4rem; padding-bottom: .4rem; }
+        </style>
+    </head>
+
+    <body class="bg-gray">
+        <form method="get">
+            <div class="container">
+                <?php foreach ($buttons as $act => $label) { ?> 
+                <button type="submit" name="action" value="<?=$act?>" class="btn<?=($action == $act? ' btn-primary': '')?>"><?=$label?></button>
+                <?php } ?>
+                <a href="/" class="btn btn-link btn-error">Reset</button>
+                <a href="<?=$help?>" class="btn btn-link">Help</a>
+            </div>
+
+            <div class="container">
+                <textarea name="str" class="form-input" placeholder="Paste a string here"><?=htmlentities($result, ENT_QUOTES | ENT_HTML5 | ENT_IGNORE)?></textarea>
+            </div>
+        </form>
+
+        <div class="container text-right">
+            <small>Contact me via <a href="mailto:correo@sergio.am">email</a> or <a href="https://twitter.com/xergio">twitter</a>. Made with pure <a href="https://php.net/">PHP</a> and <a href="https://picturepan2.github.io/spectre/">Spectre</a>. <a href="https://sergio.am/code/dencode.xrg.es">Code</a>.</small>
+        </div>
+    </body>
+</html>

app/public/ppii.php

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+<?php phpinfo();