assert

Function • Params and return types changed in PHP 8.0

Checks an assertion.

PHP 5

Improved

PHP 7.1-7.4

Improved

PHP 8.1-8.2

PHP 8.3

PHP 8.4

PHP 8.5

PHP 8.6

assert(mixed $assertion, Throwable|string|null $description = null): bool

Typemixed

This is any expression that returns a value, which will be executed and the result is used to indicate whether the assertion succeeded or failed.

OptionalTypeThrowable|string|nullDefault valuenull

If $description is an instance of Throwable, it will be thrown only if the $assertion is executed and fails.

Typebool

assert will always return true if at least one of the following is true:

If none of the conditions are true assert will return true if $assertion is truthy and false otherwise.

Changes to the `assert` Function

Return type added: bool
Parameter type added for parameter #1 ($assertion): mixed
Parameter type added for parameter #2 ($description): Throwable|string|null
Parameter default value added for position #2 ($description): null

- assert($assertion, $description)
+ assert(mixed $assertion, Throwable|string|null $description = null): bool

- assert($assertion)
+ assert($assertion, $description)