What image library is better for php to produce verification codes?

Php production verification code, which Image Library is better. GD seems to be useless. What kind of image library is better. GD seems to be useless. Recommended by great gods

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Php production verification code, which Image Library is better. GD seems to be useless. Recommended by great gods

Https://github.com/anhskohbo/no-captcha

Https://github.com/claviska/simple-php-captcha

Https://github.com/Gregwar/Captcha

ImageMagick
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ImageMagick-based PHP Extension: imagick

To be honest, the text-based documentary evidence has passed.

We report a 99.8% accuracy on the hardest category of reCAPTCHA.

The most visible aspect of Google's latest reCAPTCHA is already 99% different, higher than human:
Http://arxiv.org/abs/1312.6082

And: http://www.solidot.org/story? Sid = 1, 39040

A 90% Old Road: http://www.newscientist.com/article/dn24476-software-beats-captcha-the-webs-are-you-human-test.html? Cmpid = RSS

Http://www.infoq.com/news/2014/12/recaptcha

Therefore, do not use a text-based documentary evidence.

Go to the complete solution provided by large companies. For example, "No CAPTCHA reCAPTCHA 」.