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PHP Multi CAPTCHA: Perform CAPTCHA validation with multiple solutions

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Version License PHP version Categories
multi-captcha 1.1.5Free for non-comm...5.3PHP 5, Graphics, Validation, Security
Description Author

This package can perform CAPTCHA validation with multiple solutions.

It can generate HTML to display several types of CAPTCHA validation images or other human user verification systems.

It can display one specific type of CAPTCHA or randomly pick one of the several that are supported. Currently it supports:

- Gif captcha: Animated Gif captcha
- Image Captcha: The user has to type some or all parts of a code displayed in the image),
- HoneyPot captcha: It simply adds an empty field asking users to leave it blank, so bots fill it up
- ASCII captcha: It displays the CAPTCHA text as ASCII Art, so user has to type some characters or all the code
- Math captcha : It asks user to solve simple mathematical expressions
- Recaptcha: Google Recaptcha v1
- NoCaptcha: Google ReCaptcha v2

The class can also perform the validation to determine if the user passed the CAPTCHA text, as well render a new CAPTCHA if the user requests it.

Innovation Award
PHP Programming Innovation award nominee
July 2015
Number 2


Prize: SourceGuarding PHP encoder tool
CAPTCHA validation is used in many places to prevent that actions meant to be performed by real users are automated with robot scripts. There are many types of CAPTCHA solutions.

This package implements many types of CAPTCHA validation solutions, so applications can randomly switch to different solutions for each new probed user, thus making it more difficult to break the CAPTCHA challenges using robot scripts.

Manuel Lemos
  Performance   Level  
Name: sameer shelavale is available for providing paid consulting. Contact sameer shelavale .
Classes: 5 packages by
Country: India India
Age: 39
All time rank: 139378 in India India
Week rank: 937 Up71 in India India Up
Innovation award
Innovation award
Nominee: 1x

 

Details

multi-captcha

As the name says, this is one package to render them all! Multiple types of CAPTCHA in one package. Sometimes we just need to avoid spambots still want to keep the forms user-friendly and sometimes we need complete protection even if becomes a bit complex for users. MultiCaptcha helps you have uniform Captcha validation code over your projects.

Key Features

  1. 7 types of captcha supported with multitude of configuration options for each of them.
  2. Shows refresh button (you need to provide refresh url).
  3. Each Captcha challenge can be submitted only once.
  4. Customizable error messages
  5. You can customize the look and feel using themeOptions Or you can write your own theme/s.

Supported types of CAPTCHA

Captcha Type | Screenshot | Description | Protection | Difficulty for humans ------------- | ---------- | ----------- | -------------- | -------------- image | Image Captcha Screenshot | Asks user to identify all or some characters from the jpg image. Live demo | High | Average gif | Gif Captcha Screenshot | Asks user to identify all or some characters from the animated image. Live demo | High | Average ascii | Ascii Captcha Screenshot | Asks user to identify all or some characters from code displayed in ASCII art. Live demo | Moderate | Average math | Math Captcha Screenshot | Asks user to solve simple mathematical expression. Live demo | Below Average | Easy honeypot | Honeypot Captcha Screenshot | Asks user to leave the captcha field blank. Live demo | Low | Very Easy recaptcha | Recaptcha Screenshot (image is resized) | Google ReCaptcha. Asks user to identify all characters displayed in the jpg image. Live demo | High | Average nocaptcha | NoCaptcha Screenshot (image is resized) | Google NoCaptcha(Recaptcha v2.0). Live demo | Moderate | Average

Installation:

Using Composer

Command Line

You can install MultiCaptcha using Composer by doing

composer require sameer-shelavale/multi-captcha

composer.json

Alternatively, you can add it directly in your composer.json file in require block

{
    "require": {
        "sameer-shelavale/multi-captcha": "1.3.*"
    }
}

and then run

composer update

PHP Include

Or you can download the zip/rar archive and extract it and copy the /src folder to appropriate location in your project folder. And then include the captcha.php

Note: Make sure the cache directory is writable.

include_once( 'PATH-TO-MULTI-CAPTCHA-FOLDER/src/Captcha.php' );

Usage:

Initialize:

The minimal code required to initialize the captcha looks like:

$captcha = new \MultiCaptcha\Captcha([
    'secret'=>    "your-secret-key",
] );

The above code will initialize the captcha object to output "image" captcha which is default. Note: Its important to set your own secret key, as its used to encrypt and decrypt the captcha fields.

And more customized code looks like:

$captcha = new \MultiCaptcha\Captcha([
    'secret'=>    "your-secret-key",
    'life' => 2, //number of hours the generated captcha will be valid
    'customFieldName' => 'my_captcha', //this becomes the name of captcha answer field
    'options' =>  [
        'image' => [
            'maxCodeLength' => 8,
            'font'=>'../src/types/image/comic.ttf',
            'width'=>180
        ]
    ]
] );

Now, that we have basic knowledge of how to initialize it, lets look at the supported parameters in details,

Supported Parameters

param | description ----- | ----------- secret | Your secret code for encryption and decryption of the form. It is recommended that you use different codes for each different web form. life | total number of hours the generated captcha will be valid. If you set it to 2, then after 2 hours the validate() function will return false even if you enter the correct code. Basically it means the user is expected to submit the form within these many hours after opening the form. customFieldName | a custom name for the captcha answer field. If not provided it will use encrypted random name for the field. Note: Recaptcha type does not honor this parameter. options | field contains the array with type of captcha/s that can be rendered as keys and their configurations as value array. If we pass more than one captcha type with it's configuration, it will randomly display one type of captcha from the supplied types. We will see configuration details of each type in details in next section. refreshUrl | (Optional) url from which we will GET the new captcha using AJAX. If not provided refresh button will not be displayed. Also note that this feature is useful mainly with image, gif, ascii and math captcha. helpUrl | (Optional) url which will provide help related to the captcha type. This url will open in new tab/window.

Options

Right now we can render 7 types of captcha namely image, gif, ascii, math, honeypot, recaptcha and nocaptcha. Now lets look in details at the supported configuration parameters for each of them.

Image Captcha

| Configuration Param | Default Value | Required | Description | | ------------------- | ------------- | -------- | ---------- | | minCodeLength | 4 | Optional | Maximum length of code to be displayed in the image | | maxCodeLength | 8 | Optional | Maximum length of code to be displayed in the image | | maxRequired | 5 | Optional | Maximum number of characters it can ask the user to identify | | minRequired | 3 | Optional | Minimum number of characters it can ask the user to identify | | noiseLevel | 25 | Optional | Number of background noisy characters to be added as noise | | width | 150 | Optional | Width of the captcha image in pixels | | height | 40 | Optional | Height of the captcha image in pixels | | font | src/fonts/segoesc.ttf | Optional | Path to the font file which will be used for creating the characters |

Gif Captcha(GIF Animated captcha)

| Configuration Param | Default Value | Required | Description | | ------------------- | ------------- | -------- | ---------- | | totalFrames | 60 | Optional | Total number of frames to be produced. Please note having too many frames may overload server during heavy traffic | | delay | 5 | Optional | delay between frames in Millisecond | minCodeLength | 4 | Optional | Maximum length of code to be displayed in the image | | maxCodeLength | 8 | Optional | Maximum length of code to be displayed in the image | | maxRequired | 5 | Optional | Maximum number of characters it can ask the user to identify | | minRequired | 3 | Optional | Minimum number of characters it can ask the user to identify | | noiseLevel | 25 | Optional | Number of background noisy characters to be added as noise | | width | 150 | Optional | Width of the captcha image in pixels | | height | 40 | Optional | Height of the captcha image in pixels | | font | src/fonts/comic.ttf | Optional | Path to the font file which will be used for creating the characters |

ASCII Captcha

| Configuration Param | Default Value | Required | Description | | ------------------- | ------------- | -------- | ---------- | | fonts | comic.ttf | Optional | array containing font name(without extension) as key and the size to be rendered in pixels as value. The figlet fonts vary in size when rendered so in order to control the height and width of the captcha we need to pass the font-size. For large fonts you can pass smaller value of font size. | | fontPath | null | Optional | If you want your own Figlet fonts you can specify path to the folder containing them here. | | minCodeLength | 4 | Optional | Maximum length of code to be displayed in the image | | maxCodeLength | 8 | Optional | Maximum length of code to be displayed in the image | | maxRequired | 5 | Optional | Maximum number of characters it can ask the user to identify | | minRequired | 3 | Optional | Minimum number of characters it can ask the user to identify |

ASCII font names: You can find the currently supported ASCII figlet fonts in src/types/ascii/fonts/ folder and use the name of the font without the .flf extension.

Example of ASCII captcha configuration:

$captcha = new \MultiCaptcha\Captcha([
    'secret'=>    "your-secret-key",
    'options' =>  [
        'ascii' => [
            'maxCodeLength' => 8,
            'fonts'=>array(
                'banner' => 4, //render with font size 4px or it becomes too big
                'doom' => 8, //render with font size 8px
                'small' =>'8' //render with font size 8px, "small" font is at src/types/ascii/fonts/small.flf
            )
        ]
    ]
] );

Note, the fonts parameter, it has the font name without extension as key. and the size in pixels as the value. Unless you provide a fontPath parameter, it will look in src/types/ascii/fonts/ folder for that font.

Math Captcha(Simple Mathematical expression)

| Configuration Param | Default Value | Required | Description | | ------------------- | ------------- | -------- | ---------- | | level | 4 | Optional | Number of variables(digits) in the mathematical expression | | description | null | Required | Some text asking the user to solve the mathematical expression. |

Honeypot Captcha

| Configuration Param | Default Value | Required | Description | | ------------------- | ------------- | -------- | ---------- | | description | null | Required | Some text asking the user to leave the captcha field blank(bots will try to fill it up and get caught) |

Recaptcha

| Configuration Param | Default Value | Required | Description | | ------------------- | ------------- | -------- | ---------- | | publicKey | null | Required | You Recaptcha Public key given to you by Google | | privateKey | null | Required | You Recaptcha Public key given to you by Google |

Note: You can register and get your recaptcha keys at http://www.google.com/recaptcha

Nocaptcha

| Configuration Param | Default Value | Required | Description | | ------------------- | ------------- | -------- | ---------- | | siteKey | null | Required | You Recaptcha Site key given to you by Google | | secretKey | null | Required | You Recaptcha Secret key given to you by Google | | lang | en | Optional | language code as on https://developers.google.com/recaptcha/docs/language | Note: You can register and get your recaptcha keys at http://www.google.com/recaptcha

You can generate random type of captcha from multiple configured types.

For example You can do:

$captcha = new \MultiCaptcha\Captcha([
    'secret'=>    "your-secret-key",
    'options' =>  [
        'math' => array(
            'description'=> "Answer following question if you are human",
            'level' => 4
        ),
        'image' => array(
            'maxCodeLength' => 8,
            'font'=>'../src/types/image/comic.ttf',
            'width'=>180
        ),
        'ascii' => array(
            'maxCodeLength' => 8,
            'fonts'=>array(
                'banner'=> 4,
                'doom'=> 8,
                'small'=>'8'
            )
        ),
        'gif' => array(
            'maxCodeLength' => 8,
            'font'=>'../src/types/image/comic.ttf',
            'width'=>180,
            'height'=>60,
            'totalFrames'=>50,
            'delay'=>20
        )
    ]
] );

And then it will generate a random type of captcha from the 4 types which are configured

Render

You can use the following one liner to render the captcha

echo $captcha->render() ;

That will do it.(note that $captcha is the name of object you initialized)

Refresh

To display the refresh button, its necessary to provide the refreshUrl. Then in script of that url you can do.

echo $captcha->refresh() ;
exit; //this is important to ensure no html is trailing the captcha

Note: make sure no html is displayed before or after the captcha->refresh(); You can also render and refresh at same page, please refer to the gif, ascii, image and math captcha examples.

Validate

You can validate your form data simply by doing

if( $captcha->validate( $_POST ){
    //do further processing, validate individual form fields
}

Note: We need to pass all the submitted data to the validate function because the name of captcha field is encrypted & random. If you specify the customFieldName parameter it will require that field and the challenge field for validation. E.g. if customFieldName = my_captcha, then you need to pass an array

if( $captcha->validate( [ 'my_captcha'=>$_POST['my_captcha'], 'my_captcha_challenge'=>$_POST['my_captcha_challenge'] ] ){
    //do further processing, validate individual form fields
}

or

if( $captcha->validate( array_intersect_key($_POST, array_flip(['my_captcha', 'my_captcha_challenge']) ) ) ){
    //do further processing, validate individual form fields
}

Themes/customization

MultiCaptcha ships with a default theme named DefaultTheme. This theme supports customization of its color/style through various parameters nested under themeOptions. e.g. you can change the background color to blue

$captcha = new \MultiCaptcha\Captcha([
    'secret'=>    "form1-secret-key",
    'options' =>  [
        'image' => array(
            'maxCodeLength' => 8,
            'font'=>'../src/types/image/comic.ttf',
            'width'=>180,
            'themeOptions' => [
                'containerStyle' => 'border:1px solid #0f702d; border-radius: 5px; padding: 5px; display: table; margin: 2px; background-color: #29713f; font-family: Helvetica; font-size: 14px; max-width: 180px;position:relative;',
                'fieldStyle' => 'background-color:#52785e; border:2px solid #fff; color:#fff; font-size:120%; font-weight:bold; border-radius:3px;width:144px;',
                'labelStyle' => 'font-size:80%; line-height:100%; color: #fff;',
            ]
        ),
        'ascii' => array(
            'maxCodeLength' => 8,
            'fonts'=>array(
                'banner'=> 4,
                'doom'=> 8,
                'small'=>'8'
            ),
            'themeOptions' => [
                'containerStyle' => 'border:1px solid #1e2a37; border-radius: 5px; padding: 10px; display: table; margin: 2px; background-color: #374c63; font-family: Helvetica; font-size: 14px; max-width: 180px;position:relative;',
                'fieldStyle' => 'background-color:#4d5d6f; border:2px solid #fff; color:#fff; font-size:120%; font-weight:bold; border-radius:3px;width:144px;',
                'labelStyle' => 'font-size:80%; line-height:100%; color: #fff;'
            ]
        ),
    ],
    'refreshUrl'=>'random.php?captcha=refresh',
    'helpUrl'=>'http://github.com/sameer-shelavale/multi-captcha',

] );

Note: each captcha type can have its own theme and themeOptions

themeOptions for DefaultTheme

| Configuration Param | Description | Default Value | | ------------------- | ----------- | ------------- | | fieldClass | class for the input field | | fieldStyle | css styles for the input field | background-color:#f66a03; border:2px solid #fff; font-size:120%; font-weight:bold; border-radius:3px;width:144px; | containerStyle | css styles for the main container which contains all captcha elements (without the style= part and without enclosing quotes) | border:3px solid #000; border-radius: 5px; padding: 10px; display: table; margin: 2px; background-color: #f69d03; font-family: Arial; font-size: 14px; max-width: 180px;position:relative | questionImageStyle| css styles for the image code(for image or gif types ) | border-radius:3px; margin-bottom:5px; | questionTextStyle | css styles for the question/challenge text(for math type)| font-size:120%; font-weight:bold;background-color:#ccc; border-radius:3px; padding:4px;margin-bottom:2px;text-align:center;display:block;min-width:172px; | questionAsciiStyle| css styles for ASCII text(for the challenge text of ascii type) | background-color:#ccc; border-radius:3px; padding:4px;margin-bottom:2px;text-align:center;display:block;min-width:172px; | questionContainerStyle | css styles for the container of the question/challenge | none ; | labelStyle | css style for label | font-size:80%; line-height:100%; | helpBtnClass | css class for the help butto | btn-help | | helpBtnText | text to show on the help button | ? | refreshBtnClass | css class for the refresh button | btn-refresh | refreshBtnText | text to show up on the refresh button | &#8634; | extraHtml | extra css styles(with the enclosing style tag) | <style type="text/css"> a.btn-refresh, a.btn-help{ background-color:#fff; text-decoration:none; color:#f66a03; padding:1px 2px; border-radius:2px; vertical-align:top; margin-left:2px; display:inline-block; width:12px; height:12px; text-align:center; line-height:100%; font-size:12px; } </style>

With the above themeOptions you will be able to change the look and feel of the default theme. However if you need to change the placements of the elements you will have to write your own theme by extending the DefaultTheme Please refer example/theming.php for working example of themeOptions.

Extending the DefaultTheme

  1. The render() and refresh() functions are crucial for rendering the captcha, your theme must have it.
  2. When you extend the DefaultTheme you can use that theme by setting the theme e.g. ` $captcha = new \MultiCaptcha\Captcha([ 'secret'=> "form1-secret-key", 'options' => [ 'image' => array( 'maxCodeLength' => 8, 'font'=>'../src/types/image/comic.ttf', 'width'=>180, 'theme' => 'CustomTheme1' ), 'ascii' => array( 'maxCodeLength' => 8, 'fonts'=>array( 'banner'=> 4, 'doom'=> 8, 'small'=>'8' ), 'theme' => 'CustomTheme2' ), ], ] ); ` Note: you can have your own themeOptions when you make your own theme. Also remember to update javascipt refresh function, it needs updating whenever you change the structure/layout.

Cache

Multicaptcha uses file cache to record the answered captcha and uses it to block brute-force attack using single captcha and multiple answers. It stores the unique id of captcha and expiration time in the record, and that record is kept till the captcha expires. It uses file cache to store these records. To avoid the cache becoming too big the records are dispersed over multiple files. The number of files to be used for caching is specified by a variable $cacheSize and the directory in which the files should be stored is specified by $cacheDir, you can pass both of these variables as params to the constructor. Default cache size is 10, but you can increase it for busy websites. Note: The cache directory MUST be writable if you are using the default file cache implementation.

Features under progress

  1. Multi-language support

Planned Features

  1. Custom background image for image and gif captcha

License

AGPL3.0, Free for non-commercial use. Email me at samiirds@gmail.com for other type of licensing.

  Gif CaptchaExternal page   Image CaptchaExternal page   ASCII CaptchaExternal page   Math CaptchaExternal page   Honeypot CaptchaExternal page   RecaptchaExternal page   Google NoCaptchaExternal page   Customizing look & feelExternal page  

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Screenshots  
  • nocaptcha-captcha.jpg
  • recaptcha-captcha.jpg
  • math-captcha.gif
  • image-captcha.gif
  • gif-captcha.gif
  • honeypot-captcha.gif
  • ascii-captcha.gif
  Files folder image Files  
File Role Description
Files folder imageexamples (17 files)
Files folder imagesrc (2 files, 3 directories)
Accessible without login Plain text file composer.json Data Auxiliary data
Accessible without login Plain text file README.md Doc. Documentation

  Files folder image Files  /  examples  
File Role Description
  Accessible without login Image file ascii-captcha.gif Photo Photograph
  Accessible without login Plain text file ascii-captcha.php Example Example script
  Accessible without login Plain text file basic.php Example Example script
  Accessible without login Image file gif-captcha.gif Photo Photograph
  Accessible without login Plain text file gif-captcha.php Example Example script
  Accessible without login Image file honeypot-captcha.gif Photo Photograph
  Accessible without login Plain text file honeypot-captcha.php Example Example script
  Accessible without login Image file image-captcha.gif Photo Photograph
  Accessible without login Plain text file image-captcha.php Example Example script
  Accessible without login Image file math-captcha.gif Photo Photograph
  Accessible without login Plain text file math-captcha.php Example Example script
  Accessible without login Image file nocaptcha-captcha.jpg Photo Photograph
  Accessible without login Plain text file nocaptcha-captcha.php Example Example script
  Accessible without login Plain text file random.php Example Example script
  Accessible without login Image file recaptcha-captcha.jpg Icon Icon image
  Accessible without login Plain text file recaptcha-captcha.php Example Example script
  Accessible without login Plain text file theming.php Example Example script

  Files folder image Files  /  src  
File Role Description
Files folder imagecache (1 file)
Files folder imagethemes (1 file)
Files folder imagetypes (7 directories)
  Plain text file BaseCaptcha.php Class Class source
  Plain text file Captcha.php Class Class source

  Files folder image Files  /  src  /  cache  
File Role Description
  Accessible without login HTML file index.html Data required for having a cache directory by default

  Files folder image Files  /  src  /  themes  
File Role Description
  Plain text file DefaultTheme.php Class Class source

  Files folder image Files  /  src  /  types  
File Role Description
Files folder imageascii (2 files, 1 directory)
Files folder imagegif (2 files)
Files folder imagehoney_pot (1 file)
Files folder imageimage (1 file)
Files folder imagemath (1 file)
Files folder imagenocaptcha (1 file)
Files folder imagerecaptcha (3 files)

  Files folder image Files  /  src  /  types  /  ascii  
File Role Description
Files folder imagefonts (153 files)
  Plain text file ascii.php Class Class source
  Accessible without login Plain text file php_figlet.php Aux. Auxiliary script

  Files folder image Files  /  src  /  types  /  ascii  /  fonts  
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  Accessible without login Plain text file linux.flf Data Auxiliary data
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  Accessible without login Plain text file poison.flf Data Auxiliary data
  Accessible without login Plain text file puffy.flf Data Auxiliary data
  Accessible without login Plain text file rectangles.flf Data Auxiliary data
  Accessible without login Plain text file relief.flf Data Auxiliary data
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  Accessible without login Plain text file serifcap.flf Data Auxiliary data
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  Accessible without login Plain text file stampatello.flf Data Auxiliary data
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  Accessible without login Plain text file straight.flf Data Auxiliary data
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  Accessible without login Plain text file term.flf Data Auxiliary data
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  Accessible without login Plain text file ticksslant.flf Data Auxiliary data
  Accessible without login Plain text file tinker-toy.flf Data Auxiliary data
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  Accessible without login Plain text file univers.flf Data Auxiliary data
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  Accessible without login Plain text file weird.flf Data Auxiliary data
  Accessible without login Plain text file whimsy.flf Data Auxiliary data

  Files folder image Files  /  src  /  types  /  gif  
File Role Description
  Plain text file gif.php Class Class source
  Accessible without login Plain text file gif_encoder.php Aux. Auxiliary script

  Files folder image Files  /  src  /  types  /  honey_pot  
File Role Description
  Plain text file honey_pot.php Class Class source

  Files folder image Files  /  src  /  types  /  image  
File Role Description
  Plain text file image.php Class Class source

  Files folder image Files  /  src  /  types  /  math  
File Role Description
  Plain text file math.php Class Class source

  Files folder image Files  /  src  /  types  /  nocaptcha  
File Role Description
  Plain text file nocaptcha.php Class Class source

  Files folder image Files  /  src  /  types  /  recaptcha  
File Role Description
  Accessible without login Plain text file LICENSE Lic. License text
  Plain text file recaptcha.php Class Class source
  Plain text file recaptchalib.php Class Class source

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