<?php
require_once __DIR__.'/../vendor/autoload.php';
use Gregwar\Captcha\CaptchaBuilder;
$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";

When logging in to the module with user permissions first, we will often use verification codes. Today I would like to recommend a verification code library for your future use.

The steps to generate a verification code are roughly:

1) Generate a random string;

2) Create an image (imagecreatetruecolor), and then output the string to In the image (imagestring or imagettftext);

3) Interfere with noise in the image, such as adding some lines or pixels (imageline and imagesetpixel).

4) Output image (imagepng)

5) Destroy image resources

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