Comment 1 for bug 932494

Instructions on getting 5.4 on Debian:

To test your package with PHP 5.4 from experimental you need to add

  deb http://ftp.cz.debian.org/debian experimental main

to your /etc/apt/sources.lists and add

  Package: php5*
  Pin: release n=experimental
  Pin-Priority: 500

  Package: libapache2-mod-php5*
  Pin: release n=experimental
  Pin-Priority: 500

  Package: php-pear
  Pin: release n=experimental
  Pin-Priority: 500

to your /etc/apt/preferences file.