Description:
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If i want to get an element of an array directly returned by a function, using [], it will prints 

Parse error: syntax error, unexpected '[', expecting ',' or ';' in php shell code on line 1

Reproduce code:
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$a = array("a","b","c");

echo array_values($a)[0]; //it (doesnt) works with any function that retuns an array

Expected result:
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print to screen something like that:
a

Actual result:
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Parse error: syntax error, unexpected '[', expecting ',' or ';' in php shell code on line 1