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<?php $5 = "asd"; echo $5;
Output for 7.0.0
Parse error: syntax error, unexpected '5' (T_LNUMBER), expecting variable (T_VARIABLE) or '{' or '$' in /in/gictD on line 3
Process exited with code 255.
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.16
Parse error: syntax error, unexpected '5' (T_LNUMBER), expecting variable (T_VARIABLE) or '$' in /in/gictD on line 3
Process exited with code 255.

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