I undertook an upgrade from 3.4 to 4.0 following the migration guide to a T, going through each minor upgrade and I still had the same issue with rector hanging.
Solution was, there is an Out of the Box PagesController that has been changed at some point between 3.4 and 3.10. I had to replace it with the version from the skeleton app (https://github.com/cakephp/app/blob/3.x/src/Controller/PagesController.php) in order for rector to pass.
If that's not your problem, try running rector one directory at a time to identify the problematic file. You can find the directory listing like: $ find /path/to/app/src/ -type d
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/
CakePHP is a framework that has been around since 2005 and is known for the convenience it gives web developers. It needs very modest settings, does not require the use of XML or YAML files. It has its own ORM, which sets it apart from other similar tools. In terms of security, it is also doing well, in particular, it has a protection system against CSRF attacks.
https://cakephp.org/
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