The thesis is written in german but at least there is an english abstract.

Abstract

Since the first release of the programming language PHP, PHP has been rapidly developed. As a result to these huge improvements, many of the features from PHP 4 have been rewritten or replaced in PHP 5. For instance exception handling, abstract classes and interfaces have been introduced. Additionally, objects are not getting copied (call-by-value) every time they are assigned to another variable or used as function parameters, but assigned as reference (call-by-reference). As a result, many old and bad constructs remain in already existing applications. This leads to several issues.

That is why many companies struggle especially with security and performance problems. Manual refactoring of existing source code is time-consuming and a reason why a lot of companies abandon such improvements.
The open-source initiative of Facebook led to the tool lex-pass which is already capable of some very basic refactoring transformations. It is using the abstract syntax tree (AST) to transform PHP into corrected code according to predefined rules.

This bachelor thesis detects several anti-patterns and implements some basic transformations. As a result, these anti-patterns are automatically corrected with lex-pass. Then the implemented transformations are explained in detail and some further possible corrections are discussed. For demonstration purposes, some well known open-source projects are being tested and corrected with the written transformations.

As a conclusion the advantages and disadvantages of automatic corrections are explained and the usefulness and limitations of such automatic transformations are illustrated.

Download “Automatic Anti-Pattern Corrections for PHP” bachelor thesis

I would like to thank the people from Mayflower GmbH for their great support and Daniel Corson from Facebook for his contribution to my work.

Ein Auszug aus dem geplanten Programm:

Interaktives Code-Review einer “schlechten” Anwendung
PHP-Security (SQL-Injection, XSS, Session-Hijacking, Input-Verarbeitung)
Objektorientierte Programmierung
Testgetriebene Entwicklung
Einführung in Unit Testing, Entwicklung von Unit Tests
Werkzeuge für die PHP-Entwicklung
Funktionale Tests
Patterns für PHP
Code-Review von schlechtem und gutem Code

Mehr Informationen:
PHP Code Camp

Dazu macht man folgendes:

Zuerst importiert man in seine Working-Copy die externe Quelle mittels svn checkout <url>. Mit svn propset svn:externals "<Verzeichnis> <url>" <Name> wird nun die Eigenschaft des angegebenen Verzeichnis auf eine externe Quelle mit angegebener URI zum entsprechenden Repository gelegt. Nun kann das die Working-Copy mit svn commit -m "added external ressource" in das Repository importiert werden.

Um das ganze nun zu Überprüfen, reicht ein einfaches svn update und man sollte für das entsprechende Verzeichnis die Ausgabe: “Fetching external item into <Name>” zusätzlich zum Normalen Update-Text erhalten und das entsprechende Verzeichnis wird automatisch aus einem anderen Repository importiert bzw. aktualisiert.

Weiter Informationen zur Thematik gibt es außerdem beim svnbook.

Deswegen von mir (auch wenn man dieses Problem wohl niemals rekursiv lösen würde) der entsprechende Source-Code dazu:

int isPrime(int num, int i) {
    if (num == 0) return 0;
    if (i*i > num) return 1;
    if ((num%i) == 0) return 0;
    return isPrime(num, (i+1));
}