With composer :
{
...
"require": {
"gregwar/captcha": "1.*"
}
}
You can create a captcha with the CaptchaBuilder
:
<?php
use Gregwar\Captcha\CaptchaBuilder;
$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
// 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($userInput)) {
// instructions if user phrase is good
}
else {
// user phrase is wrong
}
You can use theses functions :
- __construct($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($distortion), enable or disable the distortion, call it before
build()
- isOCRReadable(), returns
true
if the OCR can be read using theocrad
software, you'll need to have shell_exec enabled, imagemagick and ocrad installed - buildAgainstOCR($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
- setIgnoreAllEffects($ignoreAllEffects), disable all effects on the captcha image. Recommended to use when passing custom background images for the captcha.
- testPhrase($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
You can have a look at the following repository to enjoy the Symfony 2 bundle packaging this captcha generator : https://github.com/Gregwar/CaptchaBundle
This library is under MIT license, have a look to the LICENSE
file