First version, support for sending mail not yet implemented.

vendor/gregwar/captcha/demo/ocr.php

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+<?php
+
+require_once __DIR__.'/../vendor/autoload.php';
+
+use Gregwar\Captcha\CaptchaBuilder;
+
+/**
+ * Generates 1000 captchas and try to read their code with the
+ * ocrad OCR
+ */
+
+$tests = 10000;
+$passed = 0;
+
+shell_exec('rm passed*.jpg');
+
+for ($i=0; $i<$tests; $i++) {
+    echo "Captcha $i/$tests... ";
+
+    $captcha = new CaptchaBuilder;
+
+    $captcha
+        ->setDistortion(false)
+        ->build()
+    ;
+
+    if ($captcha->isOCRReadable()) {
+        $passed++;
+        $captcha->save("passed$passed.jpg");
+        echo "passed at ocr... ";
+    } else {
+        echo "failed... ";
+    }
+
+    echo "pass rate: ".round(100*$passed/($i+1),2)."%\n";
+}
+
+echo "\n";
+echo "Over, $passed/$tests readed with OCR\n";