Feat: Create Mask.

.gitignore

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+/vendor/

Mask.php

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+<?php
+
+namespace GoldbachAlgorithms;
+
+class Mask
+{
+    const CEP = '#####-###';
+
+    public function transform(
+        string $mask,
+        string $value
+    ){
+        $value = $this->rewrite($mask, $value);
+
+        $maskared = '';
+
+        $k = 0;
+
+        for($i = 0; $i <= strlen($mask)-1; $i++) {
+            if($mask[$i] == '#') {
+                if(isset($value[$k])){
+                    $maskared .= $value[$k++];
+                }                
+            } 
+            else
+            {
+                if(isset($mask[$i]))
+                {
+                    $maskared .= $mask[$i];
+                }
+            }
+        }
+
+        return $maskared;
+
+    }
+
+    public function rewrite(
+        $mask,
+        $value
+    )
+    {
+        if($mask == self::CEP){
+            $value = str_replace('-','',$value);
+            return str_pad($value, 8, "0", STR_PAD_LEFT);
+        }
+    }
+
+    public function clear(
+        string $unmask
+    ){
+        return $unmask;
+    }
+}

composer.json

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+{
+    "name": "goldbach-algorithms/mask",
+    "description": "Mascarador de valores PHP",
+    "type": "library",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Goldbach07",
+            "email": "gustavoalves.a7@gmail.com"
+        }
+    ],
+    "autoload": {
+        "psr-4":{
+          "GoldbachAlgorithms\\Mask\\": "src/"
+        }
+      },
+    "require": {}
+}