Dedecms5.7 the backend login verification code cannot be displayed. Solution:

Solution 1: configure the environment from php. ini.

Php. in the ini file, Ctrl + F search for '_ dg' and replace extension = php_gd2.dll with extension = php_gd2.dll. That is to say, remove the semicolon before this sentence and restart the Apache server.

Solution 2,If the related environment is configured, you can disable the verification code.

Find datasafeinc_safe_config.php and open it.

Find$ Safe_gdopen = '1, 2, 3, 5, 6, 7 & prime ;;The following6, 7It is the verification code. We only need to delete 6, 7, and ensure that no verification code will be available after logging on again, as shown in the figure below.