The verification code is an image. how can I verify that the verification code is consistent in the background?
Source: Internet
Author: User
The verification code is an image. how does one verify the consistency of user input in the background? The user entered the verification code on the verification diagram, but how does the program know that it is the same as the image ?, The image is generated by php, and the string used to generate the image is retained. then, the user input is compared with the string. the background, interference point, and interference line in the verification code are the generated image, the character string is generated by your own program. we recommend that you use the SESSION verification code as an image. how can we verify the consistency of user input in the background?
The user entered the verification code on the verification diagram, but how does the program know that it is the same as the image?
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Images generated by php
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Retain the string used to generate the image
Then compare the user input with the string
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The background, interference points, and interference lines in the verification code are generated images. the strings in the verification code are generated by your own program. we recommend that you use SESSION to save them.
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