String type casing in php, is it string or String?

Question

What is the official name for the php string type?

Is it 'string' like c#, or 'String' like Java, or either?

I could not find it in http://php.net/manual/en/language.types.string.php

I want to use it to strict type my function

function getImageName() : string;

or

function getImageName() : String;

The case does not matter. `STRING` works as well as `string` or `sTrInG`. But I'd always use the lower variant (`string`). This is the preferred way to dot it. — Sindhara, Mar 13 '19 at 20:42
Interesting. I never knew PHP was case insensitive in some cases. https://stackoverflow.com/questions/33273941/php-case-sensitivity — mrwaim, Mar 13 '19 at 20:47

score 9 · Accepted Answer · answered Mar 13 '19 at 20:47

As PHP is a partially case sensitive language and, in particular, keywords are NOT case sensitive, the case doesn't matter for built-in type names. Both string and String will work as type declaration (aka 'type hint').

The official documentation mentions the lowercase variants, so it's probably a good idea to use lowercase keywords as code style — just like most PHP code styles use foreach and not Foreach, for example.

P.S. You can find the documentation on the PHP Function arguments page, 'Type declarations' section.

String type casing in php, is it string or String?

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