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<?php var_dump([ 3 ^ 4, // 7 255 ^ 256 // 511 4 ^ 12 // 8 ]);
Output for 5.6.0 - 5.6.23, 7.0.0 - 7.0.8
Parse error: syntax error, unexpected '4' (T_LNUMBER), expecting ']' in /in/haegc on line 6
Process exited with code 255.

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