Addition of files

includes/Gregwar/Captcha/PhraseBuilder.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace Gregwar\Captcha;
+
+/**
+ * Generates random phrase
+ *
+ * @author Gregwar <g.passault@gmail.com>
+ */
+class PhraseBuilder implements PhraseBuilderInterface
+{
+    /**
+     * @var int
+     */
+    public $length;
+
+    /**
+     * @var string
+     */
+    public $charset;
+    /**
+     * Constructs a PhraseBuilder with given parameters
+     */
+    public function __construct($length = 5, $charset = 'abcdefghijklmnpqrstuvwxyz123456789')
+    {
+        $this->length = $length;
+        $this->charset = $charset;
+    }
+
+    /**
+     * Generates  random phrase of given length with given charset
+     */
+    public function build($length = null, $charset = null)
+    {
+        if ($length !== null) {
+            $this->length = $length;
+        }
+        if ($charset !== null) {
+            $this->charset = $charset;
+        }
+
+        $phrase = '';
+        $chars = str_split($this->charset);
+
+        for ($i = 0; $i < $this->length; $i++) {
+            $phrase .= $chars[array_rand($chars)];
+        }
+
+        return $phrase;
+    }
+
+    /**
+     * "Niceize" a code
+     */
+    public function niceize($str)
+    {
+        return strtr(strtolower($str), '01', 'ol');
+    }
+}