SQLSTATE[42000]: Syntax error or access violation: 1253 COLLATION 'utf8mb4_unicode_ci' is not valid for CHARACTER SET 'binary'
對數據表更改，然后執行數據遷移命令php artisan migrate，之后報錯如下：
解決辦法：
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COLLATION 'utf8_unicode_ci' is not valid for CHARACTER SET 'utf8mb4'
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