Php what type is null

I found that PHP has it both ways: If you add a boolean with a value of true to an integer with a value of 3, the result will be 4 because the boolean is cast as an integer. On the other hand, if you test a boolean with a value of true for equality with an integer with a value of three, the result will be true because the integer is cast as a boolean. Some function to write out your own comparisson table in tsv format. It will test all comparables against each other with all functions.

Also, something to consider: clustering the values which compare similarly like is done on qntm. This can be done simply by hand by rearranging the order of headings to bring related values closer together. If you want to view the truth tables colorized, just: 1. Save a local copy of this page as an. View the page source with any text editor. Save the file, and view it on your browser.

PHP's loose comparisons can be a huge convenience when used properly! Find centralized, trusted content and collaborate around the technologies you use most.

Connect and share knowledge within a single location that is structured and easy to search. PHP 7 introduces return type declarations. Which means I can now indicate the return value is a certain class, interface, array, callable or one of the newly hintable scalar types, as is possible for function parameters.

Often it happens that a value is not always present, and that you might return either something of some type, or null. Is that indeed the case, or am I somehow not finding how to do it? These do not work:.

PHP 7. The first RFC I linked to is the one they went for:. If it passes, the syntax would then affect all type-hints both return types and type-hints :. There's also a competing RFC to add union types, which would be able to do the same thing, but would look different:. Nullable Types are available in PHP 7.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 6 years ago. Active 1 year, 11 months ago. Viewed 97k times.

These do not work: function returnHello : string? Improve this question. The propesed notation would then be function returnString? I've ended up emulating nullability by abusing exceptions in my application for now. If you're fine with being silly as well, this might be of use: github. Add a comment. This is useful for when different exceptions from different class hierarchies are handled the same.

You can now specify keys in list , or its new shorthand [] syntax. This enables destructuring of arrays with non-integer or non-sequential keys. In such cases, a negative offset is interpreted as being an offset from the end of the string. Negative string and array offsets are now also supported in the simple variable parsing syntax inside of strings. A new static method has been introduced to the Closure class to allow for callable s to be easily converted into Closure objects.

Support for server push has been added to the CURL extension requires version 7. New functions ». Submit a Pull Request Report a Bug. New features Nullable types Type declarations for parameters and return values can now be marked as nullable by prefixing the type name with a question mark.