mirror of
https://github.com/renbaoshuo/S2OJ.git
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147 lines
4.4 KiB
Markdown
147 lines
4.4 KiB
Markdown
Captcha
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=======
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[](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=YUXRLWHQSWS6L)
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Installation
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============
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With composer :
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``` json
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{
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...
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"require": {
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"gregwar/captcha": "1.*"
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}
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}
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```
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Usage
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=====
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You can create a captcha with the `CaptchaBuilder` :
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```php
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<?php
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use Gregwar\Captcha\CaptchaBuilder;
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$builder = new CaptchaBuilder;
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$builder->build();
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```
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You can then save it to a file :
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```php
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<?php
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$builder->save('out.jpg');
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```
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Or output it directly :
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```php
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<?php
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header('Content-type: image/jpeg');
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$builder->output();
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```
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Or inline it directly in the HTML page:
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```php
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<img src="<?php echo $builder->inline(); ?>" />
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```
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You'll be able to get the code and compare it with a user input :
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```php
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<?php
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// Example: storing the phrase in the session to test for the user
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// input later
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$_SESSION['phrase'] = $builder->getPhrase();
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```
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You can compare the phrase with user input:
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```php
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if($builder->testPhrase($userInput)) {
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// instructions if user phrase is good
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}
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else {
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// user phrase is wrong
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}
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```
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API
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===
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You can use theses functions :
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* **__construct($phrase = null)**, constructs the builder with the given phrase, if the phrase is null, a random one will be generated
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* **getPhrase()**, allow you to get the phrase contents
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* **setDistortion($distortion)**, enable or disable the distortion, call it before `build()`
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* **isOCRReadable()**, returns `true` if the OCR can be read using the `ocrad` software, you'll need to have shell_exec enabled, imagemagick and ocrad installed
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* **buildAgainstOCR($width = 150, $height = 40, $font = null)**, builds a code until it is not readable by `ocrad`
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* **build($width = 150, $height = 40, $font = null)**, builds a code with the given $width, $height and $font. By default, a random font will be used from the library
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* **save($filename, $quality = 80)**, saves the captcha into a jpeg in the $filename, with the given quality
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* **get($quality = 80)**, returns the jpeg data
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* **output($quality = 80)**, directly outputs the jpeg code to a browser
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* **setBackgroundColor($r, $g, $b)**, sets the background color to force it (this will disable many effects and is not recommended)
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* **setBackgroundImages(array($imagepath1, $imagePath2))**, Sets custom background images to be used as captcha background. It is recommended to disable image effects when passing custom images for background (ignore_all_effects). A random image is selected from the list passed, the full paths to the image files must be passed.
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* **setInterpolation($interpolate)**, enable or disable the interpolation (enabled by default), disabling it will be quicker but the images will look uglier
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* **setIgnoreAllEffects($ignoreAllEffects)**, disable all effects on the captcha image. Recommended to use when passing custom background images for the captcha.
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* **testPhrase($phrase)**, returns true if the given phrase is good
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* **setMaxBehindLines($lines)**, sets the maximum number of lines behind the code
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* **setMaxFrontLines($lines)**, sets the maximum number of lines on the front of the code
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If you want to change the number of character, you can call the phrase builder directly using
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extra parameters:
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```php
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use Gregwar\Captcha\CaptchaBuilder;
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use Gregwar\Captcha\PhraseBuilder;
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// Will build phrases of 3 characters
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$phraseBuilder = new PhraseBuilder(4)
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// Will build phrases of 5 characters, only digits
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$phraseBuilder = new PhraseBuilder(5, '0123456789');
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// Pass it as first argument of CaptchaBuilder, passing it the phrase
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// builder
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$captcha = new CaptchaBuilder(null, $phraseBuilder);
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```
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You can also pass directly the wanted phrase to the builder:
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```php
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// Building a Captcha with the "hello" phrase
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$captcha = new CaptchaBuilder('hello');
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```
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Complete example
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================
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If you want to see an example you can have a look at he ``demo/form.php``, which uses ``demo/session.php`` to
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render a captcha and check it after the submission
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Symfony Bundle
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================
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You can have a look at the following repository to enjoy the Symfony 2 bundle packaging this captcha generator :
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https://github.com/Gregwar/CaptchaBundle
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Yii2 Extension
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===============
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You can use the following extension for integrating with Yii2 Framework :
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https://github.com/juliardi/yii2-captcha
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License
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=======
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This library is under MIT license, have a look to the `LICENSE` file
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