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<?php var_dump('1' <=> 2); var_dump('2' <=> 1); var_dump('1' <=> null); var_dump(null <=> null);
based on OQYYl
Output for 7.0.0 - 7.2.0
int(-1) int(1) int(1) int(0)
Output for 5.3.19 - 5.6.28
Parse error: syntax error, unexpected '>' in /in/ofQrJ on line 3
Process exited with code 255.