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<?php var_dump(preg_match('//u', "\xF0A0808A")); var_dump(mb_convert_encoding('𠀋 ', 'ENTITIES', 'UTF-8'));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) Fatal error: Uncaught ValueError: mb_convert_encoding(): Argument #2 ($to_encoding) must be a valid encoding, "ENTITIES" given in /in/ci75K:3 Stack trace: #0 /in/ci75K(3): mb_convert_encoding('\xF0\xA0\x80\x8B ', 'ENTITIES', 'UTF-8') #1 {main} thrown in /in/ci75K on line 3
Process exited with code 255.

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