README

Requirements

• PHP Versions: 5.3 and above (up to 8.4).
• PHP Extensions: gd, mbstring, fileinfo (enabled by default).

Installation

It's available for Composer:

composer require belomaxorka/captcha

How to migrate

Just replace:

{
    ...
    "require": {
        "gregwar/captcha": "1.*"
    }
}

To:

{
    ...
    "require": {
        "belomaxorka/captcha": "1.*"
    }
}

Usage

You can create a captcha with the CaptchaBuilder:

<?php

use Gregwar\Captcha\CaptchaBuilder;
use Gregwar\Captcha\PhraseBuilder;

$builder = new CaptchaBuilder;
$builder->build();

You can then save it to a file:

<?php

$builder->save('out.jpg');

Or output it directly:

<?php

header('Content-type: image/jpeg');
$builder->output();

Or inline it directly in the HTML page:

<img src="<?php echo $builder->inline(); ?>" />

You'll be able to get the code and compare it with a user input:

<?php

// Create session to store $_SESSION['phrase']
session_start();

// Example: storing the phrase in the session to test for the user
// input later
$_SESSION['phrase'] = $builder->getPhrase();

You can compare the phrase with user input:

if ($builder->testPhrase($userInput)) {
    // instructions if user phrase is good
} else {
    // user phrase is wrong
}

Or with using PhraseBuilder:

if (PhraseBuilder::comparePhrases($_SESSION['phrase'], $userInput)) {
    // instructions if user phrase is good
} else {
    // user phrase is wrong
}

API

You can use these functions:

• __construct($phrase = null), constructs the builder with the given phrase, if the phrase is null, a random one will be generated
• getPhrase(), allow you to get the phrase contents
• setDistortion($distortion), enable or disable the distortion, call it before build()
• isOCRReadable(), returns true if the OCR can be read using the ocrad software, you'll need to have shell_exec enabled, imagemagick and ocrad installed
• buildAgainstOCR($width = 150, $height = 40, $font = null), builds a code until it is not readable by ocrad
• build($width = 150, $height = 40, $font = null), builds a code with the given $width, $height and $font. By default, a random font will be used from the library
• save($filename, $quality = 80), saves the captcha into a jpeg in the $filename, with the given quality
• get($quality = 80), returns the jpeg data
• output($quality = 80), directly outputs the jpeg code to a browser
• setBackgroundColor($r, $g, $b), sets the background color to force it (this will disable many effects and is not recommended)
• setBackgroundImages(array($imagepath1, $imagePath2)), Sets custom background images to be used as captcha background. It is recommended to disable image effects when passing custom images for background (ignore_all_effects). A random image is selected from the list passed, the full paths to the image files must be passed.
• setInterpolation($interpolate), enable or disable the interpolation (enabled by default), disabling it will be quicker but the images will look uglier
• setScatterEffect($scatterEffect), enable or disable the scatter effect (enabled by default). Note: Requires PHP 7.4 or higher.
• setIgnoreAllEffects($ignoreAllEffects), disable all effects on the captcha image. Recommended to use when passing custom background images for the captcha.
• setIgnorePostEffects($ignorePostEffects), disable post effects on the captcha image (edge, negate, contrast, colorize). Note: setIgnoreAllEffects also disables post effects.
• testPhrase($phrase), returns true if the given phrase is good
• setMaxBehindLines($lines), sets the maximum number of lines behind the code
• setMaxFrontLines($lines), sets the maximum number of lines on the front of the code

If you want to change the number of character, you can call the phrase builder directly using extra parameters:

use Gregwar\Captcha\CaptchaBuilder;
use Gregwar\Captcha\PhraseBuilder;

// Will build phrases of 3 characters
$phraseBuilder = new PhraseBuilder(4);

// Will build phrases of 5 characters, only digits
$phraseBuilder = new PhraseBuilder(5, '0123456789');

// Pass it as first argument of CaptchaBuilder, passing it the phrase
// builder
$captcha = new CaptchaBuilder(null, $phraseBuilder);

You can also pass directly the wanted phrase to the builder:

// Building a Captcha with the "hello" phrase
$captcha = new CaptchaBuilder('hello');

Complete example

If you want to see an example you can have a look at the demo/form.php, which uses demo/session.php to render a captcha and check it after the submission

Symfony Bundle

You can have a look at the following repository to enjoy the Symfony 2 bundle packaging this captcha generator: https://github.com/Gregwar/CaptchaBundle

Yii2 Extension

You can use the following extension for integrating with Yii2 Framework: https://github.com/juliardi/yii2-captcha

Examples

Have a look at the examples inside the demo folder, which should give you an impression of what's possible - or simply whip up a PHP development server:

# Change directory
cd demo

# Launch server
php -S localhost:3000

# All examples are now available in your browser, eg 'http://localhost:3000/form.php'

License

This library is under MIT license, have a look to the LICENSE file