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run code in 150+ php & hhvm versions
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<?php $a = 'µ'; $$a = "Nano"; echo ${'µ'}
based on Jm3I9
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.34
Parse error: syntax error, unexpected end of file, expecting ',' or ';' in /in/cHnM3 on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected $end, expecting ',' or ';' in /in/cHnM3 on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected $, expecting ',' or ';' in /in/cHnM3 on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `','' or `';'' in /in/cHnM3 on line 7
Process exited with code 255.