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<?php $a = 1; $b = &$a; debug_zval_dump(&$a);
Output for 7.0.0 - 7.0.15, 7.1.0 - 7.1.1
Parse error: syntax error, unexpected '&' in /in/qnJLc on line 6
Process exited with code 255.
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156.27 ms | 995 KiB | 7 Q