What is the difference between $array[test] and $array['test']?

[TitanKing]

Hi everyone,

Though I am not a newbie, I cant figure the difference between with '' and without '' in this case.

For example:

if ($array[test] == $array['test'])
{
echo "Is the same <br />";
}

What would the difference be?

Thank you in advance...
Titan

[NogDog]

$array['test'] means the element of $array with an index which is the string literal 'test'. $array[test] means the element of $array with an index which is the value of the constant named "test". If the constant "test" has not yet been defined, then PHP automatically defines it at that point in the script with a value the same as its name. Therefore, it may work the same for you either way, but if at some point in your application a constant with the name of 'test' gets defined with a value other than "test", then you've got a nasty bug that may be very difficult to track down.

Why is $foo[bar] wrong?

[TitanKing]

You get good people and bad people, you just showed yourself as a good person. Thanks for this detailed description without expecting anything in return.

Regards,
Titan