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Migrations PHP 5 - Solutions linux 2009

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Migrations PHP 5 - Solutions linux 2009

  1. 1. Programmation objet • La grande avancée de PHP 5 • Tous les ajouts sont facultatifs • Le code PHP 4 est compatible • Sauf .... le passage par copie des objets
  2. 2. La différence function mod( $obj ) { $obj->test = ‘in’ ; } $obj = new StdClass() ; $obj->test = ‘out’ ; mod( $obj ) ; echo $obj->test ; // in ou out ?
  3. 3. Code déjà compatible ? • Passage par référence explicite en PHP 4 • On utilise & (attention à ne pas en oublier) • Compatible PHP 5 sans modification • mais désactivation des erreurs strictes
  4. 4. Code non compatible ? • zend.ze1_compatibility_mode = true • interdit d’utiliser les nouveautés PHP 5 • stabilité non garantie • Sinon : corriger votre code • long, complexe, sans garantie de résultat
  5. 5. Problème • Il n’y a aucune erreur de syntaxe • Le code semble fonctionner • Parfois ça fonctionne, d’autres pas • Il faut comprendre le code pour le corriger • Demande des tests exhaustifs
  6. 6. Corriger le code ? • En haut de script : ini_set(‘zend.ze1_compatibility_mode’,‘1’); • Dans chaque classe : function __clone() { ...debug_backtrace()... } • Vérification ligne à ligne des résultats • remplacer si nécessaire par “clone”
  7. 7. MySQL • Officiellement remplacé par mysqli et pdo • Non compatible builtin avec MySQL > 4.1 • Chercher :“mysql_connect”
  8. 8. MySQL : solution • Créer un utilisateur “spécifique PHP 4” • Utiliser l’ancien système de mot de passe • old_password() dans mysql à la création • Mixer avec pdo/mysqli ? • demande + de ressources (deux liens)
  9. 9. XML • domxml et domxslt ont disparu • remplacé par dom et xsl • chercher “domxml” et “domdocument” • Script d’émulation : http://alexandre.alapetite.net/doc-alex/domxml-php4-php5/
  10. 10. La Migration • Lire la documentation officielle, les livres • Préparer un jeu de test exhaustif • Choisir entre • activer le mode de compatibilité • passer réellement en php 5
  11. 11. Migration : avant • Faire un code PHP 4 compatible • pear::compat, dbal, mise à jour des libs • Préparer les dev PHP 5 • garder une norme de codage PHP 4 (minuscules, extension mysql, etc.)
  12. 12. Migration : pendant • Aucune solution parfaite :-( • Préparer • Faire des tests • Corriger • Faire des tests • Corriger • Faire des tests ...
  13. 13. Migration : après • Régler les niveaux d’erreur (E_STRICT) • Récupérer l’ancienne configuration php.ini • Attention aux données partagées • utilisateurs mysql (old_password) • données sérialisées • bibliothèques de code

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