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PHP has done significant changes to the language specification during the last relase cicles. Those led to several incompatabilities, which effect the different versions of Drupal: While you can not use Drupal 8 with PHP under version 5.4, Drupal 6 on the other side wouldn't (and won't) run properly with all modules using PHP version 5.4. Most GNU/Linux distributions however maintain newer versions of PHP, which makes sense for security and so on.