Cannot the connect to Database with PDO. SQLSTATE[42000]: Syntax error or access violation: 1253 COLLATION 'utf8mb4_unicode_ci' is not valid for CHARACTER SET 'utf8'

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Cannot the connect to Database with PDO. SQLSTATE[42000]: 
Syntax error or access violation: 
1253 COLLATION 'utf8mb4_unicode_ci' is not valid for CHARACTER SET 'utf8'

解决办法：utf8改成utf8mb4。

set names 'utf8mb4'

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