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run code in 200+ php & hhvm versions
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<?php function f($a, $k){return var_export($a, true);} $ref = 'ref'; echo f(['no' => 'nope', 'yep' => &$ref], 'yep');
based on 2ijdN
Output for 5.4.0 - 7.2.0
array ( 'no' => 'nope', 'yep' => 'ref', )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/Fe0E9 on line 6
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 ')' in /in/Fe0E9 on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/Fe0E9 on line 6
Process exited with code 255.