Web Reference: If your data is well encoded in the database for example, make sure to use the mb_ * functions for string handling, before json_encode. Functions like substr or strlen do not work well with utf8mb4 and can cut your text and leave a malformed UTF8 Dec 29, 2025 · In this guide, we’ll demystify the root causes of this error, walk through诊断步骤 to identify problematic data, and provide actionable solutions to fix and prevent it. Whether the issue stems from database encoding, user input, or third-party data, you’ll learn how to resolve it permanently. By following these steps and considering the additional considerations, you should be able to handle and resolve "Malformed UTF-8 characters" issues encountered during JSON encoding in PHP effectively.
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