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<?php var_dump(preg_match("#\x{00a0}#siu", ' ','asdsxzc-.sd34'));
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.16, 7.0.0 - 7.0.1
Fatal error: Only variables can be passed by reference in /in/1osbV on line 3
Process exited with code 255.

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70.95 ms | 402 KiB | 23 Q