Everything we know about moving a PHP codebase from 7.4 to 8.x: the deprecations that break an upgrade, the error messages you will meet on the way and how to prove that the result still works. No theory, only what a real migration needs.
A step-by-step upgrade plan for PHP 7.4 to 8.3: find the breaking changes before you touch the code, fix them in batches and verify every release with your test suite.
PHP 8.2 deprecated writing to undeclared object properties. Here is what the deprecation is about, why frameworks are affected and the three ways to fix it.
The complete list of PHP functions removed or deprecated in PHP 8, with the exact replacement for each one - from utf8_encode() to the mysql_ and ereg() families.
Undefined array key, null passed to a non-nullable parameter, readonly property modification and eight more PHP 8 errors - each with the cause and the fix.
Both tools are excellent, but they solve different halves of the migration. Here is an honest comparison of the scan, the fix and the verification step.
A successful upgrade is not a clean scan, it is a green test suite. How to run PHPUnit after an upgrade, read the output and turn failures into a work list.
The scanner reports the compatibility problems of your project with the exact file and line, then previews every automatic fix as a diff. The first scan is free.