Inserting UTF-8 encoded string into UTF-8 encoded

问题:

Inserting UTF-8 encoded string into UTF-8 encoded table gives incorrect string value.

PDOException: SQLSTATE[HY000]: General error: 1366 Incorrect string value: '\xF0\x9D\x84\x8E i...' for column 'body_value' at row 1: INSERT INTO

I have a