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<?php $str = 'ăāæåߧśšşçæåߧś'; var_export( preg_replace('/(.)(?=.*\1)/u', '', $str );
Output for 8.0.1 - 8.0.28, 8.1.0 - 8.1.19, 8.2.0 - 8.2.6
Parse error: syntax error, unexpected token ";", expecting ")" in /in/cbEOe on line 9
Process exited with code 255.
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161.41 ms | 1000 KiB | 7 Q