Multiple versions of PHP make me a sad panda

sad-panda.txt

~ $ php.54 installer.php dev
phpDocumentor installer for manual installations
> Downloading development application from Github
> Extracting application
> Preparing dependencies

  Composer (http://www.getcomposer.org) is not installed, downloading temporary version for installation

> Downloading Composer installer to /tmp
> Installing composer to /tmp
Error: Unable to install composer itself; Composer returned: PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/curl.so' - /usr/lib64/php/modules/curl.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/fileinfo.so' - /usr/lib64/php/modules/fileinfo.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/phar.so' - /usr/lib64/php/modules/phar.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pspell.so' - /usr/lib64/php/modules/pspell.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/wddx.so' - /usr/lib64/php/modules/wddx.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  Unexpected character in input:  '\' (ASCII=92) state=1 in /tmp/installer on line 311

Warning: Unexpected character in input:  '\' (ASCII=92) state=1 in /tmp/installer on line 311
Some settings on your machine make Composer unable to work properly.
Make sure that you fix the issues listed below and run this script again:

The suhosin.executor.include.whitelist setting is incorrect.
Add the following to the end of your `php.ini` or suhosin.ini (Example path [for Debian]: /etc/php5/cli/conf.d/suhosin.ini):
    suhosin.executor.include.whitelist = phar 

The phar extension is missing.
Install it or recompile php without --disable-phar

Your PHP (5.2.17) is too old, you must upgrade to PHP 5.3.2 or higher.