How does PHP convert some of the fields received from a form to a picture save?

Form received some of the fields, such as QQ number or something, after receiving the database saved in the same time, and then converted to a picture to save a copy, what is the tool pack or something?

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Form received some of the fields, such as QQ number or something, after receiving the database saved in the same time, and then converted to a picture to save a copy, what is the tool pack or something?

You need to look at the PHP GD library, it's easy to

is the number written directly above the picture? If this is the case, the implementation of the principle and verification code is the same. If it is to generate the encoding of the picture, the amount, this I also want to know, the main success tell me

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