mb_detect_encoding()` detects UTF-8 emoji byte sequence as ISO-8859-1 since PHP 8.1 · Issue #7871 · php/php-src · GitHub
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Some utf-8 strings base64 encoded by php can not be decoded using iOS base64 library? - Stack Overflow
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PHP : PHP: Convert any string to UTF-8 without knowing the original character set, or at least try - YouTube
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