What should I do if the PHP verification code output is garbled?

Solution to garbled output of php verification code: 1. Check and modify the path to access the verification code generation method function; 2. Check and modify the file encoding; 3. Modify the verification code generation method; 4. Check whether the environment support.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.

Reasons for the php verification code output to be garbled:

1. The path to access the verification code generation method/function is incorrect;

2. The file encoding is incorrect, and the UTF8 encoding does not remove the BOM header. ;

3. There is a problem with the verification code generation method.

4. The environment does not support it.

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