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<?php $x = 5; $suffix = array( $ => "{$x}th", 1 => '1st', 2 => '2nd', 3 => '3rd' ); echo $suffix[$x];
Output for 7.0.0 - 7.0.2
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting variable (T_VARIABLE) or '{' or '$' in /in/30Eia on line 6
Process exited with code 255.
Output for 5.5.24 - 5.5.31, 5.6.8 - 5.6.17
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting variable (T_VARIABLE) or '$' in /in/30Eia on line 6
Process exited with code 255.

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