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Editorial Team
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Asked: 2026-05-27T20:04:27+00:00

class Foo { const BAR = ‘Hello’; } echo Foo::BAR; //Works echo Foo::BAR[0]; //Parse

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class Foo {
 const BAR = 'Hello';
}

echo Foo::BAR; //Works
echo Foo::BAR[0]; //Parse error: syntax error, unexpected '[', expecting ',' or ';'

I’ve found a way around this by using substr, but I’m curious to know why this doesn’t work as it is.

PHP 5.3.3 by the way.

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1 Answer

  1. Editorial Team

    I guess that PHP considers class constants like “classic” constants (e.g. created with define()).

    Therefore, they are simply replaced by their values at runtime, so Foo::BAR[0] would be interpreted by PHP as 'Hello'[0] which is not a valid syntax ($myVariable[0] being allowed).

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