This repository can easily make a captcha image for you and take control of checking its accuracy.

• Random color with each reload
• Random word types (letter&number, just letter , just number) depends on your luck ^_~
• Random text color (black or white)

• Definitely PHP >= v7.4 ;)
• GD library

1. Add Captcha.php and captcha_add.php to your current directory.
2. include Captcha.php to your main file
3. If GD library is not already active for you, just uncomment ;extension=php_gd2.dll By removing ; behind it from php.ini.
4. Follow the steps below

According to demo.php, we assume you have a form in the page:

<form class="mx-auto" method="post">
   <div class="form-group">
      <label for="exampleInputEmail1">Email address</label>
      <input type="email" class="form-control" name="email" placeholder="Enter email">
   </div>
   <div class="form-group">
      <label for="exampleInputPassword1">Password</label>
      <input type="password" class="form-control" name="password" placeholder="Password">
   </div>
   <div class="form-group ">
      <label for="exampleInputPassword1">Enter the Captcha</label>
      <div class="d-flex">
         <input type="text" class="form-control mr-2" name="captcha" placeholder="captcha">
         <img src="captcha_add.php" alt="">
      </div>
   </div>
   <button type="submit" class="btn btn-primary" name="submit">Submit</button>
</form>

As you see, I put an image tag with captcha_add.php src where the image is output.

You can have something like this:

• Image width
• Image height
• String font size (optional)
• String length (optional)
• String font family (optional)

You can set these options in captcha_add.php e.g.

$captcha = new Captcha();
$captcha->captchaControl(200,50,null,5,"Sriracha-Regular.ttf");

If you don't want to set a parameter leave it with null value and let it be the default one.

About font file that is the last parameter, you have two choices.

1. URL (As the default value) e.g. https://fonts.gstatic.com/s/acme/v17/RrQfboBx-C5_bx0.ttf
2. A font file name in the current directory

When you want to check the accuracy of the entered value you can use a static method called checkCaptcha. e.g.

<?php

if (isset($_POST['submit'])){
    if (Captcha::checkCaptcha($_POST['captcha'])){
        echo "Correct value";
    }else{
        echo "Wrong value entered!";
    }
}
 ?>

• Atena Dadkhah