The current polyfill for the function looks like this:įunction array_is_list(array $array): bool ![]() This optimisation is currently difficult to implement because checking the keys is already time-consuming. A PHP array can be well-optimised if the array keys are numbered from 0 to the number of elements. Of course, this flexibility brings with it performance problems. We can simply add new array keys during runtime and change existing keys. ![]() In PHP, complex structures can be mapped very easily with an array. So, if you simply pass null as a parameter to the internal functions, you could have problems with the code later on. With PHP versions greater than 9.0, it is planned to generate a TypError for these functions. The same behaviour is applied to internal functions in PHP 8.1, but with a deprecate warning initially. This is because even written functions may only receive a null as a parameter for scalar types if the parameter was also specified as nullable. Currently, these cannot correctly reproduce some PHP internal functions. functions that emulate PHP internal functions, to simplify the transition to new versions. Deprecate warningsįor historical reasons, internal PHP functions allow a null as an argument even though the type of the argument is not nullable. ![]() However, it is possible that the implementation may differ shortly before release. In this blog post we will cover the new features of PHP 8.1 that have already been specified as “implemented” in the RFCs.
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