Declaring an array

$a[]="Anna";
$a[]="Brittany";
$a[]="Cinder开发者_运维知识库ella";
$a[]="Diana";
$a[]="Eva";
$a[]="Fiona";
$a[]="Gunda";

When declaring it this way, does it automatically increase the index? Why is this ideal?

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Yes it does. It may not be ideal for you, but it sure is convenient for most people.

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Yes, it does. See the PHP arrays guide. Note that if you want to delete the array, you can use:

unset($a);

Or if you want to make $a become an empty array, you can use:

$a = array();

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Yes, it does. It may not be 'ideal' - but considering that you're setting an array equal to a single value, adding to the array is better than overwriting the entire array, which I suppose would be the other option for that statement.

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Yes, It automatically increasing a index but start with '0'.

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Yes its ideal, because if its not, then use an associative array.