Why Installing php and pecl so difficult in Debian?

[hce <webmail.hce@gmail.com>]

Hi,

I thought PHP is very common now days, but I found so difficult to
install it in debian. The apt-get install can't find any php, pecl,
php-xml packages.

So, I have to downloaded php5_5.2.0-8+etch10_all.deb,
php5-common_5.2.0-8+etch10_i386.deb and
php5-cgi_5.2.0-8+etch10_i386.deb manually and installed them by dkpg.
It installed php5-cgi, but on php binary in /usr/bin.

People helped me to find dh-make-php - Creates Debian source packages
for PHP PEAR and PECL extensions. Is it a right package for PHP5
extension?

How can I install all  php extensions by using apt-get?

Thank you.

Jim