Working with removed functionality in PHP 8 extensions

In this section, we will have a look at removed functionality in PHP 8 extensions. This information is extremely important in order to avoid writing code that does not work in PHP 8. Further, an awareness of removed functionality helps you prepare existing code for a PHP 8 migration.

The following table summarizes removed functionality in extensions:

Table 8.2 – Functions removed from PHP 8 extensions

The preceding table provides a useful list of removed functions. Use this list to check against your existing code prior to a PHP 8 migration.

Let's now have a look at a potentially serious change to the mbstring extension.

Discovering mbstring extension changes

The mbstring extension has had two major changes that have massive potential for a backward-compatible code break. The first change is that a significant number of convenience aliases have been removed. The second major change...