function - invoking php methods directly -

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this question has answer here:

why work:

$n = explode("@", "some@email.com"); echo $n[0];

and not work?

explode("@", "some@email.com")[0]

when try latter, get:

parse error: syntax error, unexpected '['

it works in later versions of php (>= 5.4.0):

php 5.4.0 offers wide range of new features:

[...] - function array dereferencing has been added, e.g. foo()[0]. [...]

older versions of php not support function array dereferencing, why syntax error (php not know [, tells "unexpected").


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