What should I do if the thinkphp5 cache file cannot be written?

Solution to the problem that thinkphp5 cache file cannot be written:

Related recommendations: "ThinkPHP Tutorial"

(1) One situation is that the corresponding directory does not have write permission. Use the chmod command to add the w permission of the apache program.

(2) Another possible situation is that the disk space is full, use df -h to check.

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